lkml.org 
[lkml]   [2001]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectNumbers: ext2/ext3/reiser Performance (ext3 is slow)

Hello !

On my test to optimize mysql-Performance I noticed, that the sql-bench is
significantly slower when the tables are stored on a partition with
reiserfs than ext2. I assume this is normal due to the overhead of journal
in write-intensiv tasks. I reran the test with ext3 and was shocked how
slow the bench was then. Here are the numbers for my old K6/400 with
scsi-disks.

Time to complete sql-bench

ext2 176min
reiser 203min (+15%)
ext3 310min (+76%) (first test with 2.4.14-ext3 319min)

I ran all tests multiple times. Since I used the same Kernels this
is not an vm-issue. I tested on 2.4.14, 2.4.14+ext3 and 2.5.15-pre2.
Since the sql-bench is not an pure fs-test the fs should only play a
minor role. +76% time on this test means to mean that either ext3 is
horible slow or has a severe bug.
For those who know sql-bench I say, that test-insert seems to be the worst
case. It shows
Total time: 5880 wallclock secs for ext2 and 13277 for ext3.
swap was disabled during test.

Anyone has an idea, why this ext3 "fails" at this specific test while on
normal fs-benchmarks it is much better ?

Oktay

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:13    [W:0.057 / U:1.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site