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From: Kashyap Desai <kashyap.desai@avagotech.com>
To: Bart Van Assche <bvanassche@acm.org>, linux-scsi@vger.kernel.org
Cc: aacraid@adaptec.com, Elliott@hp.com, jbottomley@parallels.com,
	hch@infradead.org
Subject: RE: [PATCH] scsi.mq:Added enable_cmd_list flags in hostt to reduce lock contention
Date: Wed, 20 Aug 2014 18:08:37 +0530	[thread overview]
Message-ID: <7932bf422121b7f7d23545abdc0065c8@mail.gmail.com> (raw)
In-Reply-To: <53F47CF8.3080708@acm.org>

> -----Original Message-----
> From: Bart Van Assche [mailto:bvanassche@acm.org]
> Sent: Wednesday, August 20, 2014 4:18 PM
> To: Kashyap.Desai@avagotech.com; linux-scsi@vger.kernel.org
> Cc: aacraid@adaptec.com; Elliott@hp.com; jbottomley@parallels.com;
> hch@infradead.org
> Subject: Re: [PATCH] scsi.mq:Added enable_cmd_list flags in hostt to
> reduce
> lock contention
>
> On 08/19/14 20:17, Kashyap.Desai@avagotech.com wrote:
> > +	if (shost->hostt->enable_cmd_list) {
>
> This code is in the hot path which means that caching "enable_cmd_list"
> in struct Scsi_Host (as is done for many other SCSI host parameters)
> probably
> will (slightly) improve performance further. Otherwise this patch looks
> fine to
> me.
I will send updated patch which will cache host template field
"enable_cmd_list" for faster access in Scsi Host.

` Kashyap
>
> Bart.

  reply	other threads:[~2014-08-20 12:38 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-19 18:17 [PATCH] scsi.mq:Added enable_cmd_list flags in hostt to reduce lock contention Kashyap.Desai
2014-08-20 10:48 ` Bart Van Assche
2014-08-20 12:38   ` Kashyap Desai [this message]
2014-08-20 12:41     ` Christoph Hellwig
2014-08-20 12:46       ` Kashyap Desai

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