Re: [Emc-users] Appropriate PCs

[giorgio foga]

Sorry for delay  really in my personal experience (only 6 j1800) i've try 
the trik of install generic vga card and disable driver matherborad  but I 
think the problem is not only the driver card  my j1800 are without cooling 
fan  in one of these I mount cooling fun with better performance and and 
lower real time problems  Actually I use with better success i3 cpu . 
(I use different model and brand)

For shure I use some industrial pc case (VIP industrial constructor) with j1800 
and atom processor with real better performance and stability  than generic 
motherboard (like asus, gigabite and other )..
I got the idea that the problem is a set of items, such as drive devices 
mounted on the motherboard, the power supply of the devices and the motherboard 
power supply  and of course the quality of the input voltage. ... All these 
problems on industrial boards are taken into account more seriously than the 
cards for pc desk.

but I'm not an expert ... mine is just an opinion 


Regards
Giorgio


> From: albertson.ch...@gmail.com
> Date: Fri, 6 May 2016 08:55:53 -0700
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Appropriate PCs
> 
> If that is the case, put in a generic VGA card and disable the built-in
> graphics.
> 
> The better option, although much more work is to read the video driver code
> carefully and remove the offending parts, such as spin-waits or other
> operations with interrupts disabled or whatever.  Video drivers are
> generally written for performance, not for real-time.  Do it once and it's
> usable by others.
> 
> On Fri, May 6, 2016 at 8:16 AM, Mark Johnsen <m...@ijohnsen.com> wrote:
> 
> > I had heard mixed reviews on the j1800 and thought someone identified the
> > video driver as an issue?  But, don't recall.  Mark
> >
> > Date: Fri, 6 May 2016 17:11:29 +0200
> > > From: giorgio foga <giorgiof...@hotmail.it>
> > > Subject: Re: [Emc-users] Appropriate PCs
> > > To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
> > > Message-ID: <dub116-w41f6a47b8d74e6b62bb265ce...@phx.gbl>
> > > Content-Type: text/plain; charset="iso-8859-1"
> > >
> > > Sorry ... my expirience with j1800 is vewry bad  ... works it work 
> > > but sometime it have realtime problem . (1/2 time every 16 -48 hour).
> > >
> > > Regards
> > > Giorgio
> >
> > --
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> 
> 
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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Re: [Emc-users] Appropriate PCs

[Gregg Eshelman]

The white PCIe x16 slot is only hooked up as an x4. 16 gig max RAM is good.
http://www.hp.com/ctg/Manual/c01549447.pdf



 
  From: Andrew <pkm...@gmail.com>
 To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> 
 Sent: Saturday, May 7, 2016 1:08 AM
 Subject: Re: [Emc-users] Appropriate PCs
   
A year back someone recommended these on the list
http://www.ebay.com/itm/281991064246
I purchased three and I like them so far.
Decent latency and more than enough processor power for a CNC PC.

   
 
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Re: [Emc-users] Appropriate PCs, Intel Xeon

[dr . klepp]

Am Samstag, 7. Mai 2016 schrieb andy pugh:
> On 7 May 2016 at 09:39, Nicklas Karlsson 
> wrote:
> 
> > I have an old server intel Xeon, it is used as a server and I did not try
> > real time kernel yet.
> 
> 
> I have been running an old Xeon server on my lathe for several years now.
> It's just about OK for latency, but does need the SMI tweak or it throws in
> a big one every 64 seconds. This is an old dual-CPU P3 Xeon in a 1U case.
> No point using one of those now that Mini-itx boards exist.
> 

After some days of fiddling I just got some dated thinkpads (X60 and X61) 
working quite nicely. I had to use smictrl, because the thinkpads special keys 
are somehow hooked to SMI and give a spike when pressed. Also Xorg had to be 
persuaded not to use the intel video driver. And at the end I found that some 
harddisks cause problems: Hitachi work fine, WD gives spikes (400us on X60, 
50us on X61). Now I have a latency of ~ 6us on X60 and ~ 15us on X61, which I 
consider quite OK.

Nik

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Re: [Emc-users] Appropriate PCs, Intel Xeon, latency sometimes

[Andy Pugh]

> On 7 May 2016, at 12:54, Nicklas Karlsson  
> wrote:
> 
> That's certainly valuable information. Once every 64 seconds or once every 
> second is equally bad just harder to find.

The fact that it was exactly every 64 seconds was the clue that prompted 
someone on the forum to identify it as SMI. 
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Re: [Emc-users] Appropriate PCs, Intel Xeon, latency sometimes

[Nicklas Karlsson]

> > I have an old server intel Xeon, it is used as a server and I did not try
> > real time kernel yet.
> 
> 
> I have been running an old Xeon server on my lathe for several years now.
> It's just about OK for latency, but does need the SMI tweak or it throws in
> a big one every 64 seconds.
> ...

That's certainly valuable information. Once every 64 seconds or once every 
second is equally bad just harder to find.

For stepper generations I have chosen a modification so that positions are sent 
and then receive FIFO is possible. As is now it allows for one full period of 
jitter and it seems to work really well. The steppers are just a small 
sidetrack for me so it would probably be a few weeks before I could finnish it 
off. The same approach should work equally for servos and as soon as I get a 
few hours I will try my servos with same approach.


Nicklas Karlsson

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Re: [Emc-users] Appropriate PCs, Intel Xeon

[andy pugh]

On 7 May 2016 at 09:39, Nicklas Karlsson 
wrote:

> I have an old server intel Xeon, it is used as a server and I did not try
> real time kernel yet.


I have been running an old Xeon server on my lathe for several years now.
It's just about OK for latency, but does need the SMI tweak or it throws in
a big one every 64 seconds. This is an old dual-CPU P3 Xeon in a 1U case.
No point using one of those now that Mini-itx boards exist.

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Re: [Emc-users] Appropriate PCs, Intel Xeon

[Nicklas Karlsson]

I have an old server intel Xeon, it is used as a server and I did not try real 
time kernel yet. If you happen to come over old servers thrown out it may be 
worth a try, even though I have no idea I suspect they are a little bit 
different built.


On Sat, 7 May 2016 10:08:17 +0300
Andrew  wrote:

> A year back someone recommended these on the list
> http://www.ebay.com/itm/281991064246
> I purchased three and I like them so far.
> Decent latency and more than enough processor power for a CNC PC.
> 
> Andrew
> 
> Andrew
> 
> 2016-05-06 9:55 GMT+03:00 Danny Miller :
> 
> > I understand the computational requirements are not stressful, but I
> > know some have management issues.
> >
> > Right now I have a old Dell computer with one of the chipsets
> > specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> > with a 7i92 card but the latency report is pretty high.  I don't have
> > any love for this PC anyhow.  Had it crash once, may be going south
> > anyhow.   Wanna get a small SSHD too.
> >
> > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
> >
> > I went to Fry's looking for their "clearance computers" and there was an
> > HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963
> > Express and  Intel Q35 chipset respectively.
> >
> > But the above URL says all the new Intel chipsets have SMI which may
> > cause latency problems.
> >
> > Anybody experienced opinions on this?
> >
> > Danny
> >
> >
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Re: [Emc-users] Appropriate PCs

[Andrew]

A year back someone recommended these on the list
http://www.ebay.com/itm/281991064246
I purchased three and I like them so far.
Decent latency and more than enough processor power for a CNC PC.

Andrew

Andrew

2016-05-06 9:55 GMT+03:00 Danny Miller :

> I understand the computational requirements are not stressful, but I
> know some have management issues.
>
> Right now I have a old Dell computer with one of the chipsets
> specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> with a 7i92 card but the latency report is pretty high.  I don't have
> any love for this PC anyhow.  Had it crash once, may be going south
> anyhow.   Wanna get a small SSHD too.
>
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
>
> I went to Fry's looking for their "clearance computers" and there was an
> HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963
> Express and  Intel Q35 chipset respectively.
>
> But the above URL says all the new Intel chipsets have SMI which may
> cause latency problems.
>
> Anybody experienced opinions on this?
>
> Danny
>
>
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> Manager
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Re: [Emc-users] Appropriate PCs

[dannym]

Well it's a Dell Optiplex 330, Intel G31 Express chipset.

I looked through BIOS- I couldn't find anything to disable that might be system 
management interrupts.

With Linux localhost 3.2.0-4-rt-686-pae #1 SMP PREEMPT RT Debian 3.2.78-1 i686 
GNU/Linux, still have onboard video, browsing the web and running bittorrent:

Servo Thread Max Interval 1,217,422ns Max Jitter 217,422ns
Base Thread  Max Interval 199,820ns  Max Jitter 174,820ns

There's an optiplex 360 with G31 chipset result here: 
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Latency-Test
They got:
1,010,913   16,443  
39,908  14,966 

So that jitter's WAY higher on my 330.  I know the onboard video can add to it, 
but can it be THAT much?   And it's beside the point because that other guy's 
test says "Intel G31 onboard Video. SMP Kernel "... those lower numbers were 
ALREADY using a video card.

I can add a video card, got several lying around, just a good amount of 
installation time really.

Danny

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Re: [Emc-users] Appropriate PCs

[Gregg Eshelman]

I have several Optiplex GX520's. They are the "large" towers but also stripped 
down. Only two RAM slots installed and the PCIe x16 slot was left out. They 
were in the end of the availability of XP where buyers had a choice between XP 
or Vista.
What cuts the value of these Optiplex boxes is the BTX form factor and the 
funky proprietary power switch board and how it connects to the main board. 
Dell just couldn't be satisfied with a simple momentary switch and a pair of 
wires... If you can find a new BTX board for upgrading, you also have to 
re-engineer the power button.
I also have some MPC (formerly micronPC) towers that are also BTX but better 
equipped and without silly switch shenanigans.
BTX *should have* replaced ATX but like the 2.88M floppy the majority of the 
industry flat out rejected the better technology.
Remember the original idiocy of the ATX design placing the CPU below the power 
supply and expecting to "cool" it by blowing on it with air warmed by passing 
through the power supply? I fixed many of those overheating PCs by installing a 
CPU fan then flipping the power supply fan to blow out, and sealing all the 
interior slots and holes in the PS with aluminum tape so all the air from that 
fan would go through the PS and out the back. Turned many a glitchy box into a 
solid performer. 

BTX addressed all the issues of the AT and ATX style by placing the CPU in a 
center/rear position with a large heat sink plus a larger, slower fan behind 
it, blowing air directly out of the case. There's also nothing blocking air 
being drawn into the front side of the CPU heat sink. BTX also corrects the 
wrong way up nature of PCI and later cards by putting the motherboard on the 
other side of the case so that the component side of expansion cards faces up 
instead of down. I always thought it was dumb to make PCI, then AGP cards 
backwards from ISA, EISA and VLB. When the first desktop got tipped on end to 
make a tower, it was logically done the way that put the components on the up 
side of the ISA cards so heat could easily rise up and away. Until BTX the 
industry kept building towers like desktops on their left ends, even in boxes 
with only PCI and an AGP slot. And they're still doing it with ones that are 
all PCI and PCI Express. BTX corrects the illogical designs and gets rejected. 
:P

 
  From: Jon Elson <el...@pico-systems.com>
 To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> 
 Sent: Friday, May 6, 2016 9:58 AM
 Subject: Re: [Emc-users] Appropriate PCs
   
On 05/06/2016 01:55 AM, Danny Miller wrote:
> I understand the computational requirements are not stressful, but I
> know some have management issues.
>
> Right now I have a old Dell computer with one of the chipsets
> specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> with a 7i92 card but the latency report is pretty high.  I don't have
> any love for this PC anyhow.  Had it crash once, may be going south
> anyhow.  Wanna get a small SSHD too.
>
>
You don't say what model.  I've had really good luck with 
Dell Optiplex GX260 and GX270 machines here that are quite 
good.  They are a bit old, now, however.  I use them with 
hardware motion controls, so the latency is not so critical 
as for software step generation.  Note that these Optiplex 
models come in 3 sizes.  SFF is very compact, but uses a 
laptop-style CD reader and only one spot for hard drive.  
The mini-tower is a bit bigger inside and has room for a 
little expansion, and then there's the full-size tower, but 
those may be rare versions.

Jon
   
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Re: [Emc-users] Appropriate PCs

[Peter C. Wallace]

On Fri, 6 May 2016, giorgio foga wrote:

> Date: Fri, 6 May 2016 17:11:29 +0200
> From: giorgio foga <giorgiof...@hotmail.it>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Appropriate PCs
> 
> Sorry ... my expirience with j1800 is vewry bad  ... works it work  but 
> sometime it have realtime problem . (1/2 time every 16 -48 hour).
>
> Regards
> Giorgio

Which model? I have a Asus J1800I-A and its fine latency wise not stellar but 
20-30 usec region over weeks of time.

You do of course have to turn off all power management options, limit Cstates
etc

>
>> Date: Fri, 6 May 2016 07:17:35 -0700
>> From: m...@ijohnsen.com
>> To: emc-users@lists.sourceforge.net
>> Subject: [Emc-users] Appropriate PCs
>>
>> Fry's promocode sale today and tomorrow for a J1800 for $179.  I believe
>> the J1800 has been used successfully.
>>
>> Seems like a decent deal to me.  By the time I had my D525MW built with
>> case, harddrive, and ram, was close to that and I had to assembly it.
>>
>> http://imgur.com/PX4A64B
>>
>> You need the fry's promo-code to get the price and will need to sign up if
>> you are already not signed up.
>>
>> Couple of SSDs I had looked at, haven't use:
>> http://amzn.to/1SRQ1ZO
>> http://amzn.to/23uNsP9
>>
>> Oh - I am currently using an unsed ADATA Ebay-d SSD, but I read long after
>> I bought it to not by used SSD drives, good advice I'll use in the future...
>>
>> Good Luck,
>> Mark
>>
>>
>>>
>>> Message: 1
>>> Date: Fri, 6 May 2016 01:55:31 -0500
>>> From: Danny Miller <dan...@austin.rr.com>
>>> Subject: [Emc-users] Appropriate PCs
>>> To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
>>> Message-ID: <572c3fe3.9090...@austin.rr.com>
>>> Content-Type: text/plain; charset=utf-8; format=flowed
>>>
>>> I understand the computational requirements are not stressful, but I
>>> know some have management issues.
>>>
>>> Right now I have a old Dell computer with one of the chipsets
>>> specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
>>> with a 7i92 card but the latency report is pretty high.  I don't have
>>> any love for this PC anyhow.  Had it crash once, may be going south
>>> anyhow.   Wanna get a small SSHD too.
>>>
>>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
>>>
>>> I went to Fry's looking for their "clearance computers" and there was an
>>> HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963
>>> Express and  Intel Q35 chipset respectively.
>>>
>>> But the above URL says all the new Intel chipsets have SMI which may
>>> cause latency problems.
>>>
>>> Anybody experienced opinions on this?
>>>
>>> Danny
>>>
>>>
>> --
>> Find and fix application performance issues faster with Applications Manager
>> Applications Manager provides deep performance insights into multiple tiers 
>> of
>> your business applications. It resolves application problems quickly and
>> reduces your MTTR. Get your free trial!
>> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
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>
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Peter Wallace
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Re: [Emc-users] Appropriate PCs

[Jon Elson]

On 05/06/2016 01:55 AM, Danny Miller wrote:
> I understand the computational requirements are not stressful, but I
> know some have management issues.
>
> Right now I have a old Dell computer with one of the chipsets
> specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> with a 7i92 card but the latency report is pretty high.  I don't have
> any love for this PC anyhow.  Had it crash once, may be going south
> anyhow.   Wanna get a small SSHD too.
>
>
You don't say what model.  I've had really good luck with 
Dell Optiplex GX260 and GX270 machines here that are quite 
good.  They are a bit old, now, however.  I use them with 
hardware motion controls, so the latency is not so critical 
as for software step generation.  Note that these Optiplex 
models come in 3 sizes.  SFF is very compact, but uses a 
laptop-style CD reader and only one spot for hard drive.  
The mini-tower is a bit bigger inside and has room for a 
little expansion, and then there's the full-size tower, but 
those may be rare versions.

Jon

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Re: [Emc-users] Appropriate PCs

[Chris Albertson]

If that is the case, put in a generic VGA card and disable the built-in
graphics.

The better option, although much more work is to read the video driver code
carefully and remove the offending parts, such as spin-waits or other
operations with interrupts disabled or whatever.  Video drivers are
generally written for performance, not for real-time.  Do it once and it's
usable by others.

On Fri, May 6, 2016 at 8:16 AM, Mark Johnsen <m...@ijohnsen.com> wrote:

> I had heard mixed reviews on the j1800 and thought someone identified the
> video driver as an issue?  But, don't recall.  Mark
>
> Date: Fri, 6 May 2016 17:11:29 +0200
> > From: giorgio foga <giorgiof...@hotmail.it>
> > Subject: Re: [Emc-users] Appropriate PCs
> > To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
> > Message-ID: <dub116-w41f6a47b8d74e6b62bb265ce...@phx.gbl>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Sorry ... my expirience with j1800 is vewry bad  ... works it work 
> > but sometime it have realtime problem . (1/2 time every 16 -48 hour).
> >
> > Regards
> > Giorgio
>
> --
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> Manager
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[Emc-users] Appropriate PCs

[Mark Johnsen]

I had heard mixed reviews on the j1800 and thought someone identified the
video driver as an issue?  But, don't recall.  Mark

Date: Fri, 6 May 2016 17:11:29 +0200
> From: giorgio foga <giorgiof...@hotmail.it>
> Subject: Re: [Emc-users] Appropriate PCs
> To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
> Message-ID: <dub116-w41f6a47b8d74e6b62bb265ce...@phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Sorry ... my expirience with j1800 is vewry bad  ... works it work 
> but sometime it have realtime problem . (1/2 time every 16 -48 hour).
>
> Regards
> Giorgio
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Re: [Emc-users] Appropriate PCs

[giorgio foga]

Sorry ... my expirience with j1800 is vewry bad  ... works it work  but 
sometime it have realtime problem . (1/2 time every 16 -48 hour).

Regards
Giorgio

> Date: Fri, 6 May 2016 07:17:35 -0700
> From: m...@ijohnsen.com
> To: emc-users@lists.sourceforge.net
> Subject: [Emc-users] Appropriate PCs
> 
> Fry's promocode sale today and tomorrow for a J1800 for $179.  I believe
> the J1800 has been used successfully.
> 
> Seems like a decent deal to me.  By the time I had my D525MW built with
> case, harddrive, and ram, was close to that and I had to assembly it.
> 
> http://imgur.com/PX4A64B
> 
> You need the fry's promo-code to get the price and will need to sign up if
> you are already not signed up.
> 
> Couple of SSDs I had looked at, haven't use:
> http://amzn.to/1SRQ1ZO
> http://amzn.to/23uNsP9
> 
> Oh - I am currently using an unsed ADATA Ebay-d SSD, but I read long after
> I bought it to not by used SSD drives, good advice I'll use in the future...
> 
> Good Luck,
> Mark
> 
> 
> >
> > Message: 1
> > Date: Fri, 6 May 2016 01:55:31 -0500
> > From: Danny Miller <dan...@austin.rr.com>
> > Subject: [Emc-users] Appropriate PCs
> > To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
> > Message-ID: <572c3fe3.9090...@austin.rr.com>
> > Content-Type: text/plain; charset=utf-8; format=flowed
> >
> > I understand the computational requirements are not stressful, but I
> > know some have management issues.
> >
> > Right now I have a old Dell computer with one of the chipsets
> > specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> > with a 7i92 card but the latency report is pretty high.  I don't have
> > any love for this PC anyhow.  Had it crash once, may be going south
> > anyhow.   Wanna get a small SSHD too.
> >
> > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
> >
> > I went to Fry's looking for their "clearance computers" and there was an
> > HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963
> > Express and  Intel Q35 chipset respectively.
> >
> > But the above URL says all the new Intel chipsets have SMI which may
> > cause latency problems.
> >
> > Anybody experienced opinions on this?
> >
> > Danny
> >
> >
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[Emc-users] Appropriate PCs

[Mark Johnsen]

Fry's promocode sale today and tomorrow for a J1800 for $179.  I believe
the J1800 has been used successfully.

Seems like a decent deal to me.  By the time I had my D525MW built with
case, harddrive, and ram, was close to that and I had to assembly it.

http://imgur.com/PX4A64B

You need the fry's promo-code to get the price and will need to sign up if
you are already not signed up.

Couple of SSDs I had looked at, haven't use:
http://amzn.to/1SRQ1ZO
http://amzn.to/23uNsP9

Oh - I am currently using an unsed ADATA Ebay-d SSD, but I read long after
I bought it to not by used SSD drives, good advice I'll use in the future...

Good Luck,
Mark


>
> Message: 1
> Date: Fri, 6 May 2016 01:55:31 -0500
> From: Danny Miller <dan...@austin.rr.com>
> Subject: [Emc-users] Appropriate PCs
> To: Enhanced Machine Controller EMC <emc-users@lists.sourceforge.net>
> Message-ID: <572c3fe3.9090...@austin.rr.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I understand the computational requirements are not stressful, but I
> know some have management issues.
>
> Right now I have a old Dell computer with one of the chipsets
> specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> with a 7i92 card but the latency report is pretty high.  I don't have
> any love for this PC anyhow.  Had it crash once, may be going south
> anyhow.   Wanna get a small SSHD too.
>
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
>
> I went to Fry's looking for their "clearance computers" and there was an
> HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963
> Express and  Intel Q35 chipset respectively.
>
> But the above URL says all the new Intel chipsets have SMI which may
> cause latency problems.
>
> Anybody experienced opinions on this?
>
> Danny
>
>
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Re: [Emc-users] Appropriate PCs

[Todd Zuercher]

Those would probably be fine as long as they don't have a neutered bios that 
doesn't allow you to turn off all the power saving stuff. (Like a few HPs I've 
tried.)

- Original Message -
From: "Danny Miller" <dan...@austin.rr.com>
To: "Enhanced Machine Controller EMC" <emc-users@lists.sourceforge.net>
Sent: Friday, May 6, 2016 2:55:31 AM
Subject: [Emc-users] Appropriate PCs

I understand the computational requirements are not stressful, but I 
know some have management issues.

Right now I have a old Dell computer with one of the chipsets 
specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4 
with a 7i92 card but the latency report is pretty high.  I don't have 
any love for this PC anyhow.  Had it crash once, may be going south 
anyhow.   Wanna get a small SSHD too.

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues

I went to Fry's looking for their "clearance computers" and there was an 
HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963 
Express and  Intel Q35 chipset respectively.

But the above URL says all the new Intel chipsets have SMI which may 
cause latency problems.

Anybody experienced opinions on this?

Danny

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Re: [Emc-users] Appropriate PCs

[Gene Heskett]

On Friday 06 May 2016 02:55:31 Danny Miller wrote:

> I understand the computational requirements are not stressful, but I
> know some have management issues.
>
> Right now I have a old Dell computer with one of the chipsets
> specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4
> with a 7i92 card but the latency report is pretty high.  I don't have
> any love for this PC anyhow.  Had it crash once, may be going south
> anyhow.   Wanna get a small SSHD too.
>
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
>
> I went to Fry's looking for their "clearance computers" and there was
> an HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel
> Q963 Express and  Intel Q35 chipset respectively.
>
> But the above URL says all the new Intel chipsets have SMI which may
> cause latency problems.
>
> Anybody experienced opinions on this?
>
> Danny

Not on those, but since you mentioned Dell, I have an off-lease Dell 
Dimension 745 that I picked up for $140 sans HD and Windows 8. 4GiB of 
dram, more than enough to run linuxcnc and several other programs at the 
same time.

I put my own HD with a recent hybrid wheezy based install on it, had to 
argue with udev a bit to make it go back to an eth0 default for the 
network port, put a 5i25 in it, and its sat there and just worked(tm) 
for about 6 months now, with the only reboots caused by either a power 
bump, or an update to a later kernel.  Latency figures are such that 
software stepping might be affected, but the 5i25 covers it very well.  
I've been running the 2.8.0-pre builds from the buildbot longer than 
that.

Solid as a rock with the 5i25 card doing the heavy lifting and lots more 
power than the intel D525MW boards in the other 2 machines.

Running the servo-thread at 4 kilohertz, no base-thread, I've started a 
test project cutting air, and ran both konversation and firefox crawling 
the net with no apparent effects on either of the three's performance.  
So I am a happy camper.  And there are  kajillions of those available at 
your local computer service company.

Cheers, Gene Heskett
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-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] Appropriate PCs

[Danny Miller]

I understand the computational requirements are not stressful, but I 
know some have management issues.

Right now I have a old Dell computer with one of the chipsets 
specifically listed as "bad".  I'm running Linux RT and LinuxCNC 2.7.4 
with a 7i92 card but the latency report is pretty high.  I don't have 
any love for this PC anyhow.  Had it crash once, may be going south 
anyhow.   Wanna get a small SSHD too.

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues

I went to Fry's looking for their "clearance computers" and there was an 
HP 5700 and Lenovo M57 and an M58.  Looked 'em up, that's Intel Q963 
Express and  Intel Q35 chipset respectively.

But the above URL says all the new Intel chipsets have SMI which may 
cause latency problems.

Anybody experienced opinions on this?

Danny

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