From: Holger Kiehl <Holger.Kiehl@dwd.de>
To: Shaohua Li <shli@fusionio.com>
Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
neilb@suse.de, axboe@kernel.dk, vgoyal@redhat.com,
martin.petersen@oracle.com
Subject: Re: [patch v2 0/6] Add TRIM support for raid linear/0/1/10
Date: Mon, 19 Mar 2012 19:38:04 +0000 (GMT) [thread overview]
Message-ID: <alpine.LRH.2.02.1203181824590.24824@diagnostix.dwd.de> (raw)
In-Reply-To: <20120316073213.656519005@fusionio.com>
Hello,
On Fri, 16 Mar 2012, Shaohua Li wrote:
> The patches add TRIM support for raid linear/0/1/10. I'll add TRIM support for
> raid 4/5/6 later. The implementation is pretty straightforward and
> self-explained.
>
> v1->v2:
> 1. fixed a checking issue
> 2. dropped discard request plug and replace it with no discard merege, because
> current SCSI layer can't handle discard request merge.
>
Have tested TRIM patches on three different systems with the following
hardware/ setup:
1) root mounted on a raid1 over two SAS SSD's (200GB) and /home partition
on a raid0 over a fusionio ioDrive Duo. Is very new and seen very
little usage.
2) root and /home mounted on a raid0 over two Intel X25 Postville
(160GB) connected to a Intel P55 Express chipset. Has seen very
heavy usage for approx. 2 years.
3) root and /home mounted on a raid0 over three OCZ-VERTEX2 (120GB)
connected via ICH7 south bridge. Has seen mild usage for approx.
1.5 years.
Made the following observations when running my own benchmark which
copies around a lot of small files and deletes them. The benchmark on
all systems was always run only on the /home partition ie. on a raid0.
For system 1) there is hardly any measurable differnce whether discard
is enabled or not (~29000 files per second).
On system 2) the performance drops from 6500->3700 files per second,
but under normal usage one does not notice any difference.
System 3) has problems during boot, it is so slow that some operations
receive a timeout during boot:
udevd[474]: timeout '/sbin/blkid -o udev -p /dev/md0'
udevd[474]: timeout: killing '/sbin/blkid -o udev -p /dev/md0' [866]
systemd[1]: dev-md3.swap activation timed out. Stopping.
Even removing discard does not help and the above errors happen during
boot and booting takes a long time.
The performance in the benchmark drops from 4000->600 files per second.
Regards,
Holger
next prev parent reply other threads:[~2012-03-19 19:38 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-16 7:32 [patch v2 0/6] Add TRIM support for raid linear/0/1/10 Shaohua Li
2012-03-16 7:32 ` [patch v2 1/6] block: makes bio_split support bio without data Shaohua Li
2012-03-16 7:32 ` [patch v2 2/6] blk: dont allow discard request merge temporarily Shaohua Li
2012-03-20 16:21 ` Vivek Goyal
2012-03-21 1:22 ` Shaohua Li
2012-03-21 12:14 ` [patch 1/2]block: handle merged discard request Shaohua Li
2012-03-22 2:32 ` Martin K. Petersen
2012-03-22 2:39 ` Shaohua Li
2012-03-22 2:53 ` Martin K. Petersen
2012-06-20 8:57 ` Christoph Hellwig
2012-06-22 3:46 ` Martin K. Petersen
2012-08-03 2:10 ` Shaohua Li
2012-08-18 3:06 ` Mike Snitzer
2012-08-18 3:47 ` Martin K. Petersen
2012-08-20 13:57 ` Mike Snitzer
2012-08-20 13:58 ` Christoph Hellwig
2012-08-20 14:12 ` Mike Snitzer
2012-08-20 14:15 ` Christoph Hellwig
2012-03-22 2:18 ` [patch v2 2/6] blk: dont allow discard request merge temporarily Martin K. Petersen
2012-03-22 2:33 ` Shaohua Li
2012-03-22 6:28 ` Christoph Hellwig
2012-03-16 7:32 ` [patch v2 3/6] md: linear supports TRIM Shaohua Li
2012-03-16 7:32 ` [patch v2 4/6] md: raid 0 " Shaohua Li
2012-03-16 7:32 ` [patch v2 5/6] md: raid 1 " Shaohua Li
2012-03-16 7:32 ` [patch v2 6/6] md: raid 10 " Shaohua Li
2012-03-19 19:38 ` Holger Kiehl [this message]
2012-03-20 1:27 ` [patch v2 0/6] Add TRIM support for raid linear/0/1/10 Shaohua Li
2012-03-20 9:50 ` Holger Kiehl
2012-03-20 12:09 ` Shaohua Li
2012-03-21 2:08 ` Shaohua Li
2012-03-21 2:24 ` Roberto Spadim
2012-03-21 2:29 ` Mathias Burén
2012-03-21 2:29 ` Mathias Burén
2012-05-08 9:59 ` Patelczyk, Maciej
2012-05-09 2:27 ` Shaohua Li
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