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

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Date:	Wed, 19 Jan 2011 09:32:14 -0500
From:	Ted Ts'o <tytso@....edu>
To:	"Alex,Shi" <alex.shi@...el.com>
Cc:	czoccolo@...il.com, vgoyal@...hat.com, jaxboe@...ionio.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [performance bug] kernel building regression on 64 LCPUs
 machine

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?

Thanks, regards,

						- Ted
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