From: Keith Mannthey <kmannth@us.ibm.com>
To: linux-ext4 <linux-ext4@vger.kernel.org>
Subject: Ext4 performance regression: Post 2.6.30
Date: Sun, 28 Mar 2010 23:25:35 -0700 [thread overview]
Message-ID: <1269843935.13369.52.camel@keith-laptop> (raw)
After 2.6.30 I am seeing large performance regressions on a raid setup.
I am working to publish a larger amount of data but I wanted to get some
quick data out about what I am seeing.
The test (FFSB test suite) I am running is basically random direct io
writes. The below data is from 128 threads all doing these random
writes. 1 and 32 thread results are not as drastically bad but 2.6.30
has the strongest results.
Under a mailserver workload I see similar performance impacts at this
same kernel change point. I hope to publish better data soon. Several
other workload types do not show this performance regression.
2.6.30:
Total Results
===============
Op Name Transactions Trans/sec % Trans % Op Weight
Throughput
======= ============ ========= ======= ===========
==========
write : 9015040 29561.46 100.000% 100.000%
115MB/sec
-
29561.46 Transactions per Second
Any kernel past 2.6.30. This is from 2.6.31-rc1:
Total Results
===============
Op Name Transactions Trans/sec % Trans % Op Weight
Throughput
======= ============ ========= ======= ===========
==========
write : 3185920 10120.50 100.000% 100.000%
39.5MB/sec
next reply other threads:[~2010-03-29 6:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-29 6:25 Keith Mannthey [this message]
2010-03-29 15:10 ` Ext4 performance regression: Post 2.6.30 Greg Freemyer
2010-03-31 1:56 ` Keith Mannthey
2010-03-31 4:06 ` Eric Sandeen
2010-03-31 22:02 ` Keith Mannthey
2010-03-31 22:06 ` Greg Freemyer
2010-03-31 22:14 ` Keith Mannthey
2010-03-31 22:55 ` Greg Freemyer
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