linux-kernel - Re: [performance bug] kernel building regression on 64 LCPUs machine

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Message-ID: <20110302094246.GA7496@quack.suse.cz>
Date:	Wed, 2 Mar 2011 10:42:46 +0100
From:	Jan Kara <jack@...e.cz>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Corrado Zoccolo <czoccolo@...il.com>, Jan Kara <jack@...e.cz>,
	"Alex,Shi" <alex.shi@...el.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"jaxboe@...ionio.com" <jaxboe@...ionio.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [performance bug] kernel building regression on 64 LCPUs
 machine

On Tue 01-03-11 14:56:43, Jeff Moyer wrote:
> Corrado Zoccolo <czoccolo@...il.com> writes:
> 
> > On Thu, Feb 24, 2011 at 1:13 PM, Jan Kara <jack@...e.cz> wrote:
> >> On Wed 23-02-11 16:24:47, Alex,Shi wrote:
> >>> Though these patches can not totally recovered the problem, but they are
> >>> quite helpful with ccache enabled situation. It increase 10% performance
> >>> on 38-rc1 kernel.
> >>  OK and what was the original performance drop with WRITE_SYNC change?
> >>
> >>> I have tried to enabled they to latest rc6 kernel but failed. the vmstat output is here:
> >>> with patches:
> >>  I'm attaching patches rebased on top of latest Linus's tree.
> >> Corrado, could you possibly run your fsync-heavy tests so that we see
> >> whether there isn't negative impact of my patches on your fsync-heavy
> >> workload? Thanks.
> > The workload was actually Jeff's, and the stalls that my change tried
> > to mitigate showed up on his enterprise class storage. Adding him so
> > he can test it.
> 
> Sorry for the late reply.  You can use either fs_mark or iozone to
> generate an fsync-heavy workload.  The test I did was to mix this with a
> sequential reader.  If you can point me at patches, I should be able to
> test this.
  The latest version of patches is attached to:
https://lkml.org/lkml/2011/2/24/125

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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