From: Linus Torvalds <torvalds@linux-foundation.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <clm@fb.com>, Josef Bacik <jbacik@fb.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Neil Brown <neilb@suse.de>, Jan Kara <jack@suse.cz>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
Date: Mon, 14 Sep 2015 13:06:25 -0700 [thread overview]
Message-ID: <CA+55aFxYQ4bfBbyG97W=Yrzf+tpezrvktBBb=DmFX1we2+mdrw@mail.gmail.com> (raw)
In-Reply-To: <20150913231258.GS26895@dastard>
On Sun, Sep 13, 2015 at 4:12 PM, Dave Chinner <david@fromorbit.com> wrote:
>
> Really need to run these numbers on slower disks where block layer
> merging makes a difference to performance.
Yeah. We've seen plugging and io schedulers not make much difference
for high-performance flash (although I think the people who argued
that noop should generally be used for non-rotating media were wrong,
I think - the elevator ends up still being critical to merging, and
while merging isn't a life-or-death situation, it tends to still
help).
For rotating rust with nasty seek times, the plugging is likely to
make the biggest difference.
Linus
next prev parent reply other threads:[~2015-09-14 20:06 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-11 19:37 [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug() Chris Mason
2015-09-11 20:02 ` Linus Torvalds
2015-09-11 20:37 ` Linus Torvalds
2015-09-11 20:40 ` Josef Bacik
2015-09-11 21:04 ` Linus Torvalds
2015-09-11 22:06 ` Linus Torvalds
2015-09-11 23:16 ` Chris Mason
2015-09-11 23:36 ` Linus Torvalds
2015-09-12 0:52 ` Linus Torvalds
2015-09-12 2:15 ` Chris Mason
2015-09-12 2:27 ` Linus Torvalds
2015-09-12 23:00 ` Chris Mason
2015-09-12 23:29 ` Linus Torvalds
2015-09-12 23:46 ` Chris Mason
2015-09-13 13:12 ` Chris Mason
2015-09-13 22:56 ` Dave Chinner
2015-09-13 23:12 ` Dave Chinner
2015-09-14 20:06 ` Linus Torvalds [this message]
2015-09-16 15:16 ` Chris Mason
2015-09-16 19:58 ` Jan Kara
2015-09-16 20:00 ` Chris Mason
2015-09-16 22:07 ` Dave Chinner
2015-09-17 0:37 ` Dave Chinner
2015-09-17 1:12 ` Linus Torvalds
2015-09-17 2:14 ` Dave Chinner
2015-09-17 19:39 ` Linus Torvalds
2015-09-17 22:42 ` Chris Mason
2015-09-17 23:08 ` Linus Torvalds
2015-09-17 23:56 ` Chris Mason
2015-09-18 0:37 ` Dave Chinner
2015-09-18 1:50 ` Linus Torvalds
2015-09-18 5:40 ` Dave Chinner
2015-09-18 6:04 ` Linus Torvalds
2015-09-18 6:06 ` Linus Torvalds
2015-09-18 14:21 ` Jens Axboe
2015-09-18 13:16 ` Chris Mason
2015-09-18 14:23 ` Jens Axboe
2015-09-18 15:32 ` Linus Torvalds
2015-09-18 15:59 ` Peter Zijlstra
2015-09-18 16:02 ` Peter Zijlstra
2015-09-18 16:12 ` Linus Torvalds
2015-09-28 14:47 ` Peter Zijlstra
2015-09-28 16:08 ` Linus Torvalds
2015-09-29 7:55 ` Ingo Molnar
2015-09-18 22:17 ` Dave Chinner
2015-09-21 9:24 ` Jan Kara
2015-09-21 9:24 ` Jan Kara
2015-09-21 20:21 ` Andrew Morton
2015-09-21 20:21 ` Andrew Morton
2015-09-17 23:03 ` Dave Chinner
2015-09-17 23:13 ` Linus Torvalds
2015-09-17 3:48 ` Chris Mason
2015-09-17 4:30 ` Dave Chinner
2015-09-17 12:13 ` Chris Mason
2015-09-11 23:06 ` Chris Mason
2015-09-11 23:13 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2015-09-09 15:23 Chris Mason
2015-09-11 18:49 ` Jens Axboe
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