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

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Date:	Fri, 25 Feb 2011 08:44:38 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Jan Kara <jack@...e.cz>
CC:	"Li, Shaohua" <shaohua.li@...el.com>,
	Corrado Zoccolo <czoccolo@...il.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

Jan Kara 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?
>   
The original drop is 30%.
>   
>> 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.
>
> 								Honza
>   

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