On Tue, Aug 19, 2014 at 3:51 AM, Kashyap Desai
kashyap.de...@avagotech.com wrote:
-Original Message-
From: linux-scsi-ow...@vger.kernel.org [mailto:linux-scsi-
ow...@vger.kernel.org] On Behalf Of Christoph Hellwig
Sent: Friday, July 18, 2014 3:43 PM
To: James Bottomley;
On Tue, Aug 19, 2014 at 03:51:42AM +0530, Kashyap Desai wrote:
I read this comment and find that very few drivers are using this
cmd_list. I think if we remove this cmd_list, performance will scale as I
am seeing major contention in this lock.
Just thought to ping you to see if this is known
On Tue, Aug 19, 2014 at 9:36 PM, Christoph Hellwig h...@lst.de wrote:
On Tue, Aug 19, 2014 at 03:51:42AM +0530, Kashyap Desai wrote:
I read this comment and find that very few drivers are using this
cmd_list. I think if we remove this cmd_list, performance will scale as I
am seeing major
-Original Message-
From: linux-scsi-ow...@vger.kernel.org [mailto:linux-scsi-
ow...@vger.kernel.org] On Behalf Of Christoph Hellwig
Sent: Friday, July 18, 2014 3:43 PM
To: James Bottomley; linux-scsi@vger.kernel.org
Cc: Jens Axboe; Bart Van Assche; Mike Christie; Martin K. Petersen;
Christoph == Christoph Hellwig h...@lst.de writes:
Christoph This patch adds support for an alternate I/O path in the scsi
Christoph midlayer which uses the blk-mq infrastructure instead of the
Christoph legacy request code.
Reviewed-by: Martin K. Petersen martin.peter...@oracle.com
--
Martin
On 06/25/2014 11:52 AM, Christoph Hellwig wrote:
+static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
+{
+ struct request_queue *q = req-q;
+ struct scsi_device *sdev = q-queuedata;
+ struct Scsi_Host *shost = sdev-host;
+ struct scsi_cmnd *cmd =
On Wed, Jul 16, 2014 at 06:13:21AM -0500, Mike Christie wrote:
I see the request timer is started before calling queue_rq, but I could
not figure out what the cancel_delayed_work here is for exactly. It
seems if the request were to time out and the eh started while queue_rq
was running we
On 06/25/2014 06:52 PM, Christoph Hellwig wrote:
This patch adds support for an alternate I/O path in the scsi midlayer
which uses the blk-mq infrastructure instead of the legacy request code.
Use of blk-mq is fully transparent to drivers, although for now a host
template field is provided to
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