From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@fb.com>
Cc: Omar Sandoval <osandov@osandov.com>,
axboe@kernel.dk, linux-block@vger.kernel.org,
linux-fsdevel@vger.kernel.org, hch@infradead.org,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 1/3] block: fast-path for small and simple direct I/O requests
Date: Tue, 15 Nov 2016 14:49:32 +0100 [thread overview]
Message-ID: <20161115134932.GA28632@lst.de> (raw)
In-Reply-To: <b10995da-5a09-d015-36f2-c7a52c0abcc4@fb.com>
On Mon, Nov 14, 2016 at 01:00:09PM -0700, Jens Axboe wrote:
> Prefetches like that tend to grow stale, in my experience. So we should
> probably just evaluate the new path cache behavior and see if it makes
> sense.
Yes. I've tested the patches with that in place, but it didn't
make a difference. Probably because we're not wasting many cycles
between the possible place for the prefetch and the use of it anyway.
next prev parent reply other threads:[~2016-11-15 13:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-12 5:11 [PATCHSET v3] block: IO polling improvements Jens Axboe
2016-11-12 5:11 ` [PATCH 1/3] block: fast-path for small and simple direct I/O requests Jens Axboe
2016-11-14 19:33 ` Omar Sandoval
2016-11-14 20:00 ` Jens Axboe
2016-11-14 20:00 ` Jens Axboe
2016-11-15 13:49 ` Christoph Hellwig [this message]
2016-11-12 5:11 ` [PATCH 2/3] blk-mq: implement hybrid poll mode for sync O_DIRECT Jens Axboe
2016-11-12 5:11 ` [PATCH 3/3] blk-mq: make the polling code adaptive Jens Axboe
2016-11-14 19:43 ` Omar Sandoval
2016-11-14 19:58 ` Jens Axboe
2016-11-14 19:58 ` Jens Axboe
2016-11-16 17:31 ` [PATCHSET v3] block: IO polling improvements Stephen Bates
2016-11-16 20:59 ` Jens Axboe
2016-11-16 20:59 ` Jens Axboe
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