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Date: Thu, 18 Mar 2010 00:23:27 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Andrea Righi <arighi@develer.com>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
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       Greg Thelen <gthelen@google.com>,
       "Kirill A. Shutemov" <kirill@shutemov.name>,
       Andrew Morton <akpm@linux-foundation.org>,
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       linux-mm@kvack.org
Subject: Re: [PATCH -mmotm 0/5] memcg: per cgroup dirty limit (v7)
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* Vivek Goyal <vgoyal@redhat.com> [2010-03-17 09:34:07]:

> > > 
> > > root cgroup
> > > ==========
> > > #time dd if=/dev/zero of=/root/zerofile bs=4K count=1M
> > > 4294967296 bytes (4.3 GB) copied, 56.098 s, 76.6 MB/s
> > > 
> > > real	0m56.614s
> > > 
> > > test1 cgroup with memory limit 100M
> > > ===================================
> > > # time dd if=/dev/zero of=/root/zerofile1 bs=4K count=1M
> > > 4294967296 bytes (4.3 GB) copied, 19.8097 s, 217 MB/s
> > > 
> > > real	0m19.992s
> > > 
> > 
> > This is strange, did you flish the cache between the two runs?
> > NOTE: Since the files are same, we reuse page cache from the
> > other cgroup.
> 
> Files are different. Note suffix "1".
>

Thanks, I'll get the perf output and see what I get. 

-- 
	Three Cheers,
	Balbir