Re: balance storm

Libo Chen
2014-05-29T07:58:03Z

On 2014/5/28 17:08, Thomas Gleixner wrote:
> On Wed, 28 May 2014, Libo Chen wrote:
>
>> On 2014/5/28 9:53, Mike Galbraith wrote:
>>> On Wed, 2014-05-28 at 09:04 +0800, Libo Chen wrote:
>>>
>>>> oh yes, no tsc only hpet in my box.
>>>
>>> Making poor E5-2658 box a crippled wreck.
>>
>> yes,it is. But cpu usage will be down from 15% to 5% when binding
>> cpu, so maybe read_hpet is not the root cause.
>
> Definitely hpet _IS_ the root cause on a machine as large as this,
> simply because everything gets serialized on the hpet access.
>
> Binding stuff to cpus just makes the timing behaviour different, so
> the hpet serialization is not that prominent, but still bad enough.
>
> Talk to your HW/BIOS vendor. The kernel cannot do anything about
> defunct hardware.

I got it!

thanks,
Libo

>
> Thanks,
>
> tglx
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