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

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Message-ID: <x49hbbmpqbo.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 01 Mar 2011 14:56:43 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	Jan Kara <jack@...e.cz>, "Alex\,Shi" <alex.shi@...el.com>,
	"Li\, Shaohua" <shaohua.li@...el.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"tytso\@mit.edu" <tytso@....edu>,
	"jaxboe\@fusionio.com" <jaxboe@...ionio.com>,
	"linux-kernel\@vger.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

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.

Cheers,
Jeff
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