linux-kernel - Re: balance storm

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Message-ID: <20140528105238.GB17196@pd.tnic>
Date:	Wed, 28 May 2014 12:52:38 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Libo Chen <libo.chen@...wei.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>, mingo@...e.hu,
	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Li Zefan <lizefan@...wei.com>,
	Huang Qiang <h.huangqiang@...wei.com>
Subject: Re: balance storm

On Wed, May 28, 2014 at 12:30:19PM +0200, Peter Zijlstra wrote:
> On Wed, May 28, 2014 at 11:08:40AM +0200, 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.
> 
> ---
> Subject: x86: FW_BUG when the TSC goes funny on hardware where it really should be stable
> 
> It happens far too often on 'consumer' grade hardware, and sometimes on
> 'enterprise' too that the TSC gets marked unstable due to FW fuckage,
> complain more loudly in this case.
> 
> Signed-off-by: Peter Zijlstra <peterz@...radead.org>

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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