Date: Wed, 12 Nov 2008 07:54:29 -0500
From: Christoph Hellwig <hch@infradead.org>
To: Jeff Layton <jlayton@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>, Jeff Moyer <jmoyer@redhat.com>,
       "Vitaly V. Bursov" <vitalyb@telenet.dn.ua>,
       linux-kernel@vger.kernel.org, bfields@fieldses.org
Subject: Re: Slow file transfer speeds with CFQ IO scheduler in some cases
Message-ID: <20081112125429.GA12463@infradead.org>
References: <20081111093426.GS26778@kernel.dk> <20081111093540.GT26778@kernel.dk> <20081111115227.GU26778@kernel.dk> <4919B884.5000604@telenet.dn.ua> <20081111180659.GC26778@kernel.dk> <x49vduunjh4.fsf@segfault.boston.devel.redhat.com> <20081111164104.48f4dbd8@tleilax.poochiereds.net> <20081111165931.6f98401b@tleilax.poochiereds.net> <20081112122033.GO26778@kernel.dk> <20081112074503.47e175ae@tleilax.poochiereds.net>
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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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