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

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Message-ID: <x49r59zrqu9.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 22 Mar 2011 13:46:06 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jan Kara <jack@...e.cz>
Cc:	"Alex\,Shi" <alex.shi@...el.com>,
	Corrado Zoccolo <czoccolo@...il.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

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.

Did you receive my last couple of private emails commenting on the trace
data?

Cheers,
Jeff
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