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

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Message-ID: <1295489524.1949.884.camel@sli10-conroe>
Date:	Thu, 20 Jan 2011 10:12:04 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Ted Ts'o <tytso@....edu>
Cc:	"Shi, Alex" <alex.shi@...el.com>,
	"czoccolo@...il.com" <czoccolo@...il.com>,
	"vgoyal@...hat.com" <vgoyal@...hat.com>,
	"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, 2011-01-19 at 22:32 +0800, Ted Ts'o wrote:
> On Wed, Jan 19, 2011 at 09:55:48AM +0800, Alex,Shi wrote:
> > Shaohua and I tested kernel building performance on latest kernel. and
> > found it is drop about 15% on our 64 LCPUs NHM-EX machine on ext4 file
> > system. 
> 
> What kerenl version were you comparing against?  And what were you
> using to benchmark this performance drop?  I'm curious what your
> workload was; I'm guesisng it was some kind of mixed read/write
> workload?  Were there any fsync()'s involved?
2.6.36 vs 2.6.37. this exists in 2.6.37-rc1. it's a kbuild, no a mixed
read/write workload. kbuild hasn't fsync involved

Thanks,
Shaohua


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