From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH] nvmet: Use direct IO for writes
Date: Thu, 22 Sep 2016 15:57:07 +0200 [thread overview]
Message-ID: <20160922135707.GA14645@lst.de> (raw)
In-Reply-To: <1474481450-5036-1-git-send-email-sagi@grimberg.me>
On Wed, Sep 21, 2016@11:10:50AM -0700, Sagi Grimberg wrote:
> We're designed to work with high-end devices where
> direct IO makes perfect sense. We noticed that we
> context switch by scheduling kblockd instead of going
> directly to the device without REQ_SYNC for writes.
This looks reasonable. But I still wonder why we bother to inject delay
for any fast blk-mq device (background: Sagi told me he is observing
issues without this on a NVMe PCIe card backend)
next prev parent reply other threads:[~2016-09-22 13:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-21 18:10 [PATCH] nvmet: Use direct IO for writes Sagi Grimberg
2016-09-22 13:57 ` Christoph Hellwig [this message]
2016-09-22 14:09 ` Jens Axboe
2016-09-23 21:00 ` Sagi Grimberg
2016-09-23 21:01 ` Jens Axboe
2016-09-23 21:12 ` Sagi Grimberg
2016-09-23 21:13 ` Jens Axboe
2016-09-23 23:36 ` Christoph Hellwig
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