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

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Message-ID: <AANLkTinAeQMy-OoYYpbYeX=EjZ_-uT=67Ktk1PbE=A7_@mail.gmail.com>
Date:	Sat, 26 Feb 2011 15:45:12 +0100
From:	Corrado Zoccolo <czoccolo@...il.com>
To:	Jan Kara <jack@...e.cz>, Jeff Moyer <jmoyer@...hat.com>
Cc:	"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 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.

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



-- 
__________________________________________________________________________

dott. Corrado Zoccolo                          mailto:czoccolo@...il.com
PhD - Department of Computer Science - University of Pisa, Italy
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