On Tuesday 10 May 2011 12:28:01 Adam Carter wrote:
I haven't been able to find clear info on Hyperthreading, but from what I
can tell it appears that with Hyperthreading On;
1. per core performance is slightly reduced
Not in all circumstances...
2. you can run two threads per core, but there
In general, for a desktop or server that is doing a lot of different
things, HT
is likely to improve performance.
If the server is dedicated to a single service, there is a distinct chance
HT
will lead to decreased performance.
Thanks Joost! That certainly helps.
Are you viewing /proc/cpuinfo to get that information or just watching
as it boots? Also, what do you get if you do this:
grep -i 'smp' /boot/config
If you don't have a symbolic link from /boot/config to your kernel
config you will have to change the path somewhat (for example,
On 12/13/05, Jeff Williams [EMAIL PROTECTED] wrote:
Are you viewing /proc/cpuinfo to get that information or just watching
as it boots? Also, what do you get if you do this:
i was actually watching 'top' i could never get the smp function to
work. here is what cpuinfo gives:
mail ~ # cat
On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote:
seems to look correct doesnt it? its just not showing up as two cpus,
:-\ what do you think?
I think HT support is tied somehow to ACPI. Do you have ACPI support
built into your kernel?
-Richard
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On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote:
On 12/13/05, Jeff Williams [EMAIL PROTECTED] wrote:
Are you viewing /proc/cpuinfo to get that information or just watching
as it boots? Also, what do you get if you do this:
i was actually watching 'top' i could never get the smp function to
In top what happens when you hit the number '1'?
it only lists the one cpu.
Seems a bit strange to me.
- Mark
its a server, i dont think i built ACPI into the kernel cause i didnt
need/want it, dont think that should make a difference.
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Richard Fish wrote:
On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote:
its a server, i dont think i built ACPI into the kernel cause i didnt
need/want it, dont think that should make a difference.
I think it does. At least, there is an acpi=ht boot option for the
kernel that says to enable
On 12/13/05, Glenn Enright [EMAIL PROTECTED] wrote:
On Wednesday 14 December 2005 09:29, Nick Smith wrote:
its a server, i dont think i built ACPI into the kernel cause i didnt
need/want it, dont think that should make a difference.
From what I can see SMP functoinality seems to rely quite
thanks to everyone that helped, ya'll are gods, that got me working with smp/HT
thanks again
Nick
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On Wed, 2005-10-19 at 23:55 -0400, Statux wrote:
Hello all.
I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those
of you who know of the Intel Processor Numbers) - kernel 2.6.13.
I have a 3.0GHz P4 HT in my laptop, with HT working fine(ish) on 2.6.13
I did some random
On Thu, 2005-10-20 at 15:27 +0930, Iain Buchanan wrote:
[snip]
CONFIG_ACPI_PROCESSOR=y
CONFIG_NR_CPUS=2
You've probably got certain things selected under ACPI because you're
using a laptop. This is merely a desktop system so all I really need to
do, as far as I know - correct me if I'm wrong,
On Wed, 2005-10-19 at 21:25 -0700, Richard Fish wrote:
[snip]
Try adding acpi=ht to your kernel command line, which will enable just
enough of ACPI to get hyperthreading working.
I tried adding that and the kernel recognises that I've tried the option
but ACPI still won't start up (I even
On Wednesday 19 October 2005 10:55 pm, Statux wrote:
I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those
of you who know of the Intel Processor Numbers) - kernel 2.6.13. I've
enabled SMP and the HT scheduling option in the kernel config along with
ACPI as I was told that
Statux wrote:
Hello all.
I've done a fair amount of research in order to try and solve the issue
of my HyperThreading not getting enabled. I, however, have not gotten
anywhere with it.
I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those
of you who know of the Intel
On Thu, 2005-10-20 at 15:46 -0600, Dennis wrote:
You may check into that possiblility before wasting too much time
tweeking kernel options.
This motherboard, BIOS, and CPU all do support it. The problem seems to
be that ACPI fails to start for some reason. Solving that should fix
everything.
I
On Thu, 2005-10-20 at 16:15 -0500, Jeff Smelser wrote:
This sounds kinda dumb, but I would pull out a gentoo live CD and see if it
detects it. If it doesnt, there is something bios/hardware wise wrong with
your setup, if it does, we can start going through kernel wise..
Interesting news,
On 10/20/05, Statux [EMAIL PROTECTED] wrote:
I can't test this any further with my disappearing keyboard issue.
I'm not having your SMP problem but I did have the keyboard hang when
I first tried going to SMP. In you have a USB keyboard available it
will likely not have the problem. Someone
On Thu, 2005-10-20 at 18:00 -0700, Mark Knecht wrote:
I'm not having your SMP problem but I did have the keyboard hang when
I first tried going to SMP. In you have a USB keyboard available it
will likely not have the problem. Someone on the LKML also suggested a
boot option called
On 10/20/05, Statux [EMAIL PROTECTED] wrote:
On Thu, 2005-10-20 at 18:00 -0700, Mark Knecht wrote:
I'm not having your SMP problem but I did have the keyboard hang when
I first tried going to SMP. In you have a USB keyboard available it
will likely not have the problem. Someone on the LKML
Statux wrote:
Hello all.
current situation. I did recall that I had ACPI turned off in BIOS which
logically should be on for the kernel to get any hardware backing but
enabling it caused my keyboard to work up until a few seconds after the
login prompt comes up. After that, it locks up (LEDs
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