linux-kernel - Re: balance storm

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Date:	Wed, 28 May 2014 13:55:12 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Libo Chen <libo.chen@...wei.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, 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>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: balance storm

On Wed, 2014-05-28 at 19:43 +0800, Libo Chen wrote: 
> 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?

I'm quite sure it's because of the patches I mentioned.

-Mike

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