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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@fb.com>
Cc: axboe@kernel.dk, linux-kernel@vger.kernel.org,
	linux-scsi@vger.kernel.org, hch@lst.de
Subject: Re: [PATCH 4/6] mpt2sas: store scsi io tracker data in the scsi request
Date: Mon, 13 Apr 2015 11:49:44 +0200	[thread overview]
Message-ID: <20150413094944.GE5259@lst.de> (raw)
In-Reply-To: <1428427120-20971-5-git-send-email-axboe@fb.com>

On Tue, Apr 07, 2015 at 11:18:38AM -0600, Jens Axboe wrote:
> Instead of storing the IO tracker structure in a separate list
> that we need to pop/push to on every submit and complete (and
> lock), store it in the pdu associated with a request. This is
> possible on scsi-mq only, and further cuts the spinlock associated
> time for higher IOPS IO workloads. At 100K IOPS, this effectively
> cuts the locking time in half.

As mentioned before please call scsi_init_shared_tag_map and use your
new code path for the !mq case as well.

  reply	other threads:[~2015-04-13  9:49 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-07 17:18 [PATCH RFC v2] mpt2/mpt3sas lock reduction for scsi-mq Jens Axboe
2015-04-07 17:18 ` Jens Axboe
2015-04-07 17:18 ` [PATCH 1/6] scsi: add host template init/exit_command hooks Jens Axboe
2015-04-07 17:18   ` Jens Axboe
2015-04-07 17:18 ` [PATCH 2/6] scsi: ensure that a request is valid when returning it from scsi_find_tag() Jens Axboe
2015-04-07 17:18   ` Jens Axboe
2015-04-13  9:47   ` Christoph Hellwig
2015-04-07 17:18 ` [PATCH 3/6] mpt2sas: get rid of MPI2_FUNCTION_SCSI_TASK_MGMT Jens Axboe
2015-04-07 17:18   ` Jens Axboe
2015-04-13  9:49   ` Christoph Hellwig
2015-04-07 17:18 ` [PATCH 4/6] mpt2sas: store scsi io tracker data in the scsi request Jens Axboe
2015-04-07 17:18   ` Jens Axboe
2015-04-13  9:49   ` Christoph Hellwig [this message]
2015-04-07 17:18 ` [PATCH 5/6] mpt3sas: get rid of MPI2_FUNCTION_SCSI_TASK_MGMT Jens Axboe
2015-04-07 17:18   ` Jens Axboe
2015-04-07 17:18 ` [PATCH 6/6] mpt3sas: store scsi io tracker data in the scsi request Jens Axboe
2015-04-07 17:18   ` Jens Axboe
2015-04-13  9:50 ` [PATCH RFC v2] mpt2/mpt3sas lock reduction for scsi-mq Christoph Hellwig

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