Re: 10/7/2014 Weekly Ceph Performance Meeting: kernel boot params

[Andreas Bluemle <andreas.bluemle@itxperts.de>]

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).


Best Regards

Andreas Bluemle






On Wed, 8 Oct 2014 02:51:21 +0200
Mark Nelson <mark.nelson@inktank.com> wrote:

> Hi All,
> 
> Just a remind that the weekly performance meeting is on Wednesdays at 
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-- 
Andreas Bluemle                     mailto:Andreas.Bluemle@itxperts.de
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