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

[Stefan Priebe <s.priebe@profihost.ag>]

> 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@inktank.com> wrote:
>
>> Hi All,
>>
>> Just a remind that the weekly performance meeting is on Wednesdays at
>> 8AM PST.  Same bat time, same bat channel!
>>
>> Etherpad URL:
>> http://pad.ceph.com/p/performance_weekly
>>
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>> Mark
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>
>
>
> --
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