linux-kernel - Re: [patch/rfc/rft] sd: allocate request

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Message-ID: <50859C4D.7050309@kernel.dk>
Date:	Mon, 22 Oct 2012 21:19:41 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	SCSI Mailing List <linux-scsi@...r.kernel.org>
Subject: Re: [patch/rfc/rft] sd: allocate request_queue on device's local
 numa node

On 2012-10-22 21:01, Jeff Moyer wrote:
> Hi,
> 
> All of the infrastructure is available to allocate a request_queue on a
> particular numa node, but it isn't being utilized at all.  Wire up the
> sd driver to allocate the request_queue on the HBA's local numa node.
> 
> This is a request for comments and testing (I've built and booted it,
> nothing more).  I believe that this should be a performance win, but I
> have no numbers to back it up as yet.  Suggestions for workloads to test
> are welcome.

Would seem pointless _not_ to do it, if we have the info. Some
scsi_debug non-delay fio microbenchmark should show it easily. Combine
with perf as needed to verify.


-- 
Jens Axboe

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