linux-kernel - Re: balance storm

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Message-ID: <5385CBCE.9040507@huawei.com>
Date:	Wed, 28 May 2014 19:43:10 +0800
From:	Libo Chen <libo.chen@...wei.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Mike Galbraith <umgwanakikbuti@...il.com>, <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	"Li Zefan" <lizefan@...wei.com>, <peterz@...radead.org>,
	Huang Qiang <h.huangqiang@...wei.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Borislav Petkov" <bp@...en8.de>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: balance storm

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.

thank you for your reply.but suse sp2 is very good in this scene.
Can it be said there has a bug, then community fix it later,
so it's just a coincidence?

Libo

> 
> Thanks,
> 
> 	tglx
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