linux-kernel - Re: [PATCH 0/8][V2] blk-throttle: Throttle buffered WRITEs in balance_dirty

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Message-ID: <20110629200442.GC22301@redhat.com>
Date:	Wed, 29 Jun 2011 16:04:42 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Andrea Righi <andrea@...terlinux.com>
Cc:	linux-kernel@...r.kernel.org, jaxboe@...ionio.com,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 0/8][V2] blk-throttle: Throttle buffered WRITEs in
 balance_dirty_pages()

On Wed, Jun 29, 2011 at 06:05:32PM +0200, Andrea Righi wrote:

[..]
> > > Have you tried to do some tests? (i.e. create multiple cgroups with very
> > > low I/O limit doing parallel O_DIRECT WRITEs, and try to run at the same
> > > time "ls" or other simple commands from the root cgroup or unlimited
> > > cgroup).
> > 
> > I did. On ext4, I created a cgroup with limit 1byte per second and 
> > started a direct write and did "ls", "sync" and some directory traversal
> > operations in same diretory and it seems to work.
> 
> Confirm. Everything seems to work fine also on my side.
> 
> Tested-by: Andrea Righi <andrea@...terlinux.com>
> 
> FYI, I've used the following script to test it if you're interested.
> I tested both with O_DIRECT=1 and O_DIRECT=0.

Thanks for testing these patches. This script looks good. Will save it.

Thanks
Vivek
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