From: Martin Steigerwald <Martin@lichtvoll.de>
To: linux-btrfs@vger.kernel.org
Cc: Marc MERLIN <marc@merlins.org>, "Fajar A. Nugraha" <list@fajar.net>
Subject: Re: How can btrfs take 23sec to stat 23K files from an SSD?
Date: Thu, 2 Aug 2012 13:25:17 +0200 [thread overview]
Message-ID: <201208021325.17433.Martin@lichtvoll.de> (raw)
In-Reply-To: <20120802050741.GA22772@merlins.org>
Am Donnerstag, 2. August 2012 schrieb Marc MERLIN:
> So, doctor, is it bad? :)
>
> randomwrite: (g=0): rw=randwrite, bs=2K-16K/2K-16K, ioengine=libaio, iodepth=64
> sequentialwrite: (g=1): rw=write, bs=2K-16K/2K-16K, ioengine=libaio, iodepth=64
> randomread: (g=2): rw=randread, bs=2K-16K/2K-16K, ioengine=libaio, iodepth=64
> sequentialread: (g=3): rw=read, bs=2K-16K/2K-16K, ioengine=libaio, iodepth=64
> 2.0.8
> Starting 4 processes
> randomwrite: Laying out IO file(s) (1 file(s) / 2048MB)
> Jobs: 1 (f=1): [___R] [100.0% done] [558.8M/0K /s] [63.8K/0 iops] [eta 00m:00s]
> randomwrite: (groupid=0, jobs=1): err= 0: pid=7193
> write: io=102048KB, bw=1700.8KB/s, iops=189 , runt= 60003msec
> slat (usec): min=21 , max=219834 , avg=5250.91, stdev=5936.55
> clat (usec): min=25 , max=738932 , avg=329339.45, stdev=106004.63
> lat (msec): min=4 , max=751 , avg=334.59, stdev=107.57
> clat percentiles (msec):
Heck, I didn´t look at the IOPS figure!
189 IOPS for a SATA-600 SSD. Thats pathetic.
So again, please test this without dm_crypt. I can´t believe that this
is the maximum the hardware is able to achieve.
A really fast 15000 rpm SAS harddisk might top that.
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
next prev parent reply other threads:[~2012-08-02 11:25 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-30 0:37 brtfs on top of dmcrypt with SSD. No corruption iff write cache off? Marc MERLIN
2012-02-01 17:56 ` Chris Mason
2012-02-02 3:23 ` Marc MERLIN
2012-02-02 12:42 ` Chris Mason
[not found] ` <20120202152722.GI12429@merlins.org>
2012-02-12 22:32 ` Marc MERLIN
2012-02-12 23:47 ` Milan Broz
2012-02-13 0:14 ` Marc MERLIN
2012-02-15 15:42 ` Calvin Walton
2012-02-15 16:55 ` Marc MERLIN
2012-02-15 16:59 ` Hugo Mills
2012-02-22 10:28 ` Justin Ossevoort
2012-02-22 11:07 ` Hugo Mills
2012-02-16 6:33 ` Chris Samuel
2012-02-18 12:33 ` Martin Steigerwald
2012-02-18 12:39 ` Martin Steigerwald
2012-02-18 12:49 ` Martin Steigerwald
2012-07-18 18:13 ` brtfs on top of dmcrypt with SSD -> Trim or no Trim Marc MERLIN
2012-07-18 20:04 ` Fajar A. Nugraha
2012-07-18 20:37 ` Marc MERLIN
2012-07-18 21:34 ` Clemens Eisserer
2012-07-18 21:48 ` Marc MERLIN
2012-07-18 21:49 ` Martin Steigerwald
2012-07-18 22:04 ` Marc MERLIN
2012-07-19 10:40 ` Martin Steigerwald
2012-07-22 18:58 ` brtfs on top of dmcrypt with SSD -> ssd or nossd + crypt performance? Marc MERLIN
2012-07-22 19:35 ` Martin Steigerwald
2012-07-22 19:43 ` Martin Steigerwald
2012-07-22 20:44 ` Marc MERLIN
2012-07-22 22:41 ` brtfs on top of dmcrypt with SSD -> file access 5x slower than spinning disk Marc MERLIN
2012-07-23 6:42 ` How can btrfs take 23sec to stat 23K files from an SSD? Marc MERLIN
2012-07-24 7:56 ` Martin Steigerwald
2012-07-27 4:40 ` Marc MERLIN
2012-07-27 11:08 ` Chris Mason
2012-07-27 18:42 ` Marc MERLIN
[not found] ` <20120801053042.GG12695@merlins.org>
2012-08-01 6:01 ` Marc MERLIN
2012-08-01 6:08 ` Fajar A. Nugraha
2012-08-01 6:21 ` Marc MERLIN
2012-08-01 21:57 ` Martin Steigerwald
2012-08-02 5:07 ` Marc MERLIN
2012-08-02 11:18 ` Martin Steigerwald
2012-08-02 17:39 ` Marc MERLIN
2012-08-02 20:20 ` Martin Steigerwald
2012-08-02 20:44 ` Marc MERLIN
2012-08-02 21:21 ` Martin Steigerwald
2012-08-02 21:49 ` Marc MERLIN
2012-08-03 18:45 ` Martin Steigerwald
2012-08-16 7:45 ` Marc MERLIN
2012-08-02 11:25 ` Martin Steigerwald [this message]
2012-08-01 6:36 ` Chris Samuel
2012-08-01 6:40 ` Marc MERLIN
2012-02-18 16:07 ` brtfs on top of dmcrypt with SSD. No corruption iff write cache off? Marc MERLIN
2012-02-19 0:53 ` Clemens Eisserer
-- strict thread matches above, loose matches on Subject: below --
2012-07-24 6:18 How can btrfs take 23sec to stat 23K files from an SSD? Marc MERLIN
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