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

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Date:	Thu, 24 Mar 2011 14:45:39 +0800
From:	"Alex,Shi" <alex.shi@...el.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, Corrado Zoccolo <czoccolo@...il.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 Wed, 2011-03-23 at 01:46 +0800, Jeff Moyer wrote:
> Jan Kara <jack@...e.cz> writes:
> 
> > Jeff, I suppose the log files of fs_mark processes are on the same
> > device as the test directory, aren't they - that might explain the
> > flusher thread doing IO? The patch below
> 
> No.  My test environments are sane.  The file system is on a completely
> separate disk and it is unmounted and remounted in between each run.
> That should take care of any lost flushes.

Jeff, why not give a try with Jan's fs_mark patch? Maybe the result show
something change. :) 

> 
> Did you receive my last couple of private emails commenting on the trace
> data?
> 
> Cheers,
> Jeff


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