linux-kernel - Re: [PATCH 10/11] VFS: Cache request_queue in struct block

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Message-ID: <4E4D7E3C.8060104@linux.intel.com>
Date:	Thu, 18 Aug 2011 14:03:56 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [PATCH 10/11] VFS: Cache request_queue in struct block_device


> Is the performance gain because of this one less dereference really
> substantial.
Yes it is measurable on a large macro benchmark.

The gain is from doing the prefetch early enough, and that needs the 
additional pointer.

-Andi

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