Hi,
as mentioned during today's meeting, here are the kernel boot parameters which I found to provide the basis for good performance results:
processor.max_cstate=0
intel_idle.max_cstate=0
I understand these to basically turn off any power saving modes of the CPU; the CPU's we are using are like
Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz
Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz
At the BIOS level, we
- turn off Hyperthraeding
- turn off Turbo mode (in order ot not leave the specifications)
- turn on frequency floor override
We also assert that
/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
is set to "performance"
Using above we see a constant frequency at the maximum level allowed by the CPU (except Turbo mode).
How much performance do we gain by this? Till now i thought it's just
1-3% so i'm still running ondemand govenor plus power savings.
Greets,
Stefan
Best Regards
Andreas Bluemle
On Wed, 8 Oct 2014 02:51:21 +0200
Mark Nelson <mark.nelson@xxxxxxxxxxx> wrote:
Hi All,
Just a remind that the weekly performance meeting is on Wednesdays at
8AM PST. Same bat time, same bat channel!
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