From: Holger Kiehl <Holger.Kiehl@dwd.de>
To: Shaohua Li <shli@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>,
"neilb@suse.de" <neilb@suse.de>,
"axboe@kernel.dk" <axboe@kernel.dk>
Subject: Re: [patch 0/7] Add TRIM support for raid linear/0/1/10
Date: Wed, 14 Mar 2012 21:13:02 +0000 (GMT) [thread overview]
Message-ID: <alpine.LRH.2.02.1203142101290.6232@diagnostix.dwd.de> (raw)
In-Reply-To: <CANejiEXP9ORKTfE4O9khaHSp-Y8yOQU1LLUD5Q5pBJOGR+A-aA@mail.gmail.com>
On Wed, 14 Mar 2012, Shaohua Li wrote:
> Maybe the discard runs slow with small size request in the disk.
> please drop patch "blk: add plug for blkdev_issue_discard" and try again. Since
> we can't do merge, the plug just introduces latency.
>
Tried again without the patch applied, but there is only a very small
performance increase (520->600 agains 4000 fps without discard).
The benchmark creates lots of small files (2 KiB) and deletes them again.
> if it doesn't help, please capture a blktrace when you do the benchmark and
> send it to me.
>
Ok, I will do this tomorrow. Need some sleep :-)
Thanks for your work on supporting discard in MD!
Regards,
Holger
next prev parent reply other threads:[~2012-03-14 21:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-12 3:04 Shaohua Li
2012-03-12 3:04 ` [patch 1/7] block: makes bio_split support bio without data Shaohua Li
2012-03-12 3:04 ` [patch 2/7] md: linear supports TRIM Shaohua Li
2012-03-12 3:04 ` [patch 3/7] md: raid 0 " Shaohua Li
2012-03-12 3:04 ` [patch 4/7] md: raid 1 " Shaohua Li
2012-03-12 3:04 ` [patch 5/7] md: raid 10 " Shaohua Li
2012-03-12 3:04 ` [patch 6/7] blk: add plug for blkdev_issue_discard Shaohua Li
2012-03-13 15:51 ` Vivek Goyal
2012-03-13 17:04 ` Martin K. Petersen
2012-03-13 17:14 ` Vivek Goyal
2012-03-13 17:19 ` Martin K. Petersen
2012-03-12 3:04 ` [patch 7/7] blk: use correct sectors limitation for discard request Shaohua Li
2012-03-13 16:00 ` Vivek Goyal
2012-03-12 3:18 ` [patch 0/7] Add TRIM support for raid linear/0/1/10 Roberto Spadim
2012-03-12 18:22 ` Holger Kiehl
[not found] ` <4F5EFEB6.4060402@kernel.org>
2012-03-13 12:22 ` Holger Kiehl
2012-03-13 14:15 ` Shaohua Li
2012-03-13 14:58 ` Roberto Spadim
2012-03-13 15:44 ` Holger Kiehl
2012-03-14 1:30 ` Shaohua Li
2012-03-14 10:25 ` Holger Kiehl
2012-03-14 11:14 ` Shaohua Li
2012-03-14 11:32 ` Shaohua Li
2012-03-14 21:01 ` Holger Kiehl
2012-03-14 21:13 ` Holger Kiehl [this message]
2012-03-15 2:39 ` Shaohua Li
2012-03-15 9:08 ` Holger Kiehl
2012-03-16 2:19 ` Shaohua Li
[not found] ` <4F5EA8E9.5010502@fusionio.com>
2012-03-14 2:25 ` NeilBrown
2012-03-14 2:24 ` NeilBrown
2012-03-14 2:47 ` Shaohua Li
2012-03-17 18:14 ` Mark Lord
2012-03-18 2:03 ` Shaohua Li
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