linux-kernel - Re: Slow file transfer speeds with CFQ IO scheduler in some cases

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Message-ID: <20081112125429.GA12463@infradead.org>
Date:	Wed, 12 Nov 2008 07:54:29 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Jeff Moyer <jmoyer@...hat.com>,
	"Vitaly V. Bursov" <vitalyb@...enet.dn.ua>,
	linux-kernel@...r.kernel.org, bfields@...ldses.org
Subject: Re: Slow file transfer speeds with CFQ IO scheduler in some cases

On Wed, Nov 12, 2008 at 07:45:03AM -0500, Jeff Layton wrote:
> Ahh Good point...I wasn't thinking about it the right way. I guess what
> we really need is some way to tell that a series of I/O requests
> originated from the same client thread. NFS isn't really conducive to
> this...
> 
> We might be able to do something like that with NFSv4 though. Maybe an
> io_context per state owner or something. That's probably not going to
> be trivial to implement however...

Talk to Greg Banks, he's been thinking about and working on an open
files cache for quite a while already.

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