From: keith.busch@intel.com (Keith Busch)
Subject: [PATCH 5/5] NVMe: IO queue deletion re-write
Date: Sat, 2 Jan 2016 21:30:09 +0000 [thread overview]
Message-ID: <20160102213008.GA10969@localhost.localdomain> (raw)
In-Reply-To: <20160102170730.GA30184@infradead.org>
On Sat, Jan 02, 2016@09:07:30AM -0800, Christoph Hellwig wrote:
> Just curious: why do we even both with the async queue shutdown. At
> least the controllers I have access to complete queue deletions very
> quickly.
The async deletion was written for a bug reporting "hang" on a device
removal. The "hang" was the controller taking on the order of 100's msec
to delete a queue (sometimes >1sec if lots of commands queued). This
controller had 2k queues, and took ~15 minutes to remove serially. Async
deletion brought it down to ~20 seconds, so looked like a good idea.
It wasn't a controller I make, so I personally don't care about
parallelizing queue deletion. The driver's been this way for so long
though, I don't have a good way to know how beneficial this feature
is anymore.
next prev parent reply other threads:[~2016-01-02 21:30 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-30 17:27 [PATCH 0/5] NVMe fixes and updates for 4.5 Keith Busch
2015-12-30 17:27 ` [PATCH 1/5] NVMe: Fix admin queue ring wrap Keith Busch
2015-12-30 17:49 ` Christoph Hellwig
2015-12-30 17:56 ` Keith Busch
2015-12-30 17:53 ` Jens Axboe
2015-12-30 18:09 ` Christoph Hellwig
2015-12-30 17:27 ` [PATCH 2/5] NVMe: Use a retryable error code on reset Keith Busch
2015-12-30 17:52 ` Christoph Hellwig
2015-12-30 18:09 ` Keith Busch
2015-12-30 18:18 ` Christoph Hellwig
2015-12-30 17:27 ` [PATCH 3/5] NVMe: Remove queue freezing on resets Keith Busch
2015-12-30 17:53 ` Christoph Hellwig
2015-12-30 20:44 ` Sagi Grimberg
2015-12-30 20:42 ` Sagi Grimberg
2015-12-31 17:19 ` Sagi Grimberg
2015-12-30 17:27 ` [PATCH 4/5] NVMe: Shutdown controller only for power-off Keith Busch
2015-12-30 17:58 ` Christoph Hellwig
2015-12-30 18:02 ` Keith Busch
2015-12-30 18:14 ` Christoph Hellwig
2015-12-30 17:27 ` [PATCH 5/5] NVMe: IO queue deletion re-write Keith Busch
2015-12-30 18:04 ` Christoph Hellwig
2015-12-30 19:07 ` Keith Busch
2016-01-02 17:07 ` Christoph Hellwig
2016-01-02 21:30 ` Keith Busch [this message]
2016-01-03 11:40 ` Christoph Hellwig
2016-01-03 15:43 ` Keith Busch
2016-01-03 16:17 ` Christoph Hellwig
2016-01-03 16:26 ` Keith Busch
2016-01-03 18:04 ` Keith Busch
2016-01-03 17:05 ` Sagi Grimberg
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