Tim,
I found this on the the Thesycon Web site (DPC Lat)
"
Windows 8 Compatibility:The DPC latency utility runs on Windows 8 but
does not show correct values. The output suggests that the Windows 8
kernel performs badly and introduces a constant latency of one
millisecond which is not the case in practice. DPCs in the Windows 8
kernel behave identical to Windows 7. The utility produces incorrect
results because the implementation of kernel timers has changed in
Windows 8 which causes a side effect with the measuring algorithm used
by the utility. Thesycon is working on a new version of the DPC latency
utility and will make it available on this site as soon as it is finished.
"
I also noticed that Resplendence LatencyMon gives a little different
picture of Win8 latency on my laptop ( recently upgraded to win8) than
does DPCLAT..
On My Win8 Laptop, DPCLat shows a solid 1000usec reading while
LatencyMon shows average < 100 usec with spikes rElated to ACPI to 1000+
seconds at about 10 second intervals.
AL, K0VM
On 10/29/2012 7:32 AM, Tim Ellison, W4TME wrote:
With all new operating systems, hardware driver development always
lags behind. DPCs are causes by poorly written hardware drivers not
prioritized for system performance and minimal latency.
Upgrade your hardware drivers from the hardware manufacturer (not
Microsoft) and see if that helps.
BTW, the pro audio and gamer crowds have been complaining about this
issue with Win8 since the Previews were released. You need to
understand that Win8 is a primarily a mobile device OS, so there are
going to be kernel features that compliment those devices rather than
PCs. One area of concern with mobile devices is battery life and to
extend it the OS is going to turn off or throttle down power hungry
devices (CPUs). Turning them back on or throttling them back up takes
time which incurslatency.
We are testing PowerSDR with Win8 right now. There are no issues we
have found to date that are show stoppers, so we are saying it "works
with" Win8 at this time. An official stand on it will come laterafter
more complete testing has been done.
Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
4616 W Howard Ln, Suite 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: [email protected] <mailto:[email protected]>
Web: www.flexradio.com <http://www.flexradio.com>
logo
On 10/29/2012 6:21 AM, Les Keppie wrote:
Hi Koos
Interesting situation - hi
Yes - I think I shall wait a while to see other experiences before I
make a move
Les
On Mon, 29 Oct 2012 20:00:36 +1100, Koos du Plessis ZS6BFD
<[email protected]> wrote:
Hi Les,
Same situation experienced here on Saturday Afternoon after my
upgrade to W8
Pro.....
Running an Intel Quad Core CPU which previously performed very well
on W7.
After booting W8 - (at least for the first 15-30 minutes), The 5000A
(under
PSDR 2.4.4) really battles to stabilize. It got so bad at times
that the
audio just died completely.
When checking the DPC Counters, I noticed the counters above >
1000 (and
as high as >10000), incrementing occasionally.....I never noticed this
before when running W7
I have already managed some improvement by performing a general
clean-up of
Processes, Services and applications on the PC.
I now only Power-off or reset the PC when I really have to and
things are
going relatively OK but I am still monitoring the PC's latency on a
regular
basis ......
I am considering moving back to W7 again. Waiting to see what
experience
other Flexers are having with W8.
Thank you for taking the time to raise this.
73 de Koos
ZS6BFD
-----Original Message-----
From: FlexRadio [mailto:[email protected]] On Behalf
Of Les
Keppie
Sent: 29 October 2012 10:02
To: [email protected]; [email protected]
Subject: [Flexradio] Problem with high DPC count after upgrading to
W8 Pro
Hi All
Have just upgraded from Windows 7 Ultimate to Windows 8 Pro Computer
is Asus
m/b M4A78-VM - processor is 3.1g AMD Phenom(tm) II X2
550 Processor Socket AM3 (938)
with 4g ram - radio is Flex 3000
This system has been running well on W7 ultimate with dpc count of
less than
100us normally around the 75us Now with the upgrade to W8 Pro dpc is
around
1000us LatencyMon reports Current measured kernel timer latency
around 12 to
16us with Highest measured kernel timer latency as 1000 to 1009us
Transmitting using EasyPal gives regular breaks in tx audio with
receiving
station reporting no lock on signal
Anyone got any ideas on how to reduce the dpc spikes or will it be a
trip
down the W7 reinstallation path???
So far have not been able to work out if it is possible to uninstall
W8 back
to W7
I have an image of the system from september 9 but W8 doesnt want to
know
about it
Regards
Les VK2DSG
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