* ext3 reservation seems to cause major slowdown in synctest in 2.6.10-rc2 vs 2.6.9
@ 2004-11-15 6:33 Yusuf Goolamabbas
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From: Yusuf Goolamabbas @ 2004-11-15 6:33 UTC (permalink / raw)
To: linux-kernel
I have a P3-500 box /384 MB ram and 2 scsi disks (sda and sdb).
OS is on sda and test partions is on sdb
aic7xxx driver
Using anticipatory schedulor with a tag_depth of 4 (this is set via
modules.conf)
options aic7xxx aic7xxx=global_tag_depth:4
/dev/sdb1 is created with ext3 and htree is enabled. Mounted as /htree
synctest obtained from here (synctest tries to simulate an MTA
behaviour)
http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz
I run the following commands on both 2.6.9 and 2.6.10-rc2
/usr/bin/time -p ./synctest -fu -t 100 -p1 -n1 /htree/nfsexport
timing results
2.6.9
real 57.35
user 1.37
sys 14.26
2.6.10-rc2
real 86.83
user 1.32
sys 14.02
Mounting with noreservation gives the following numbers
real 58.77
user 1.46
sys 14.48
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2004-11-15 6:33 ext3 reservation seems to cause major slowdown in synctest in 2.6.10-rc2 vs 2.6.9 Yusuf Goolamabbas
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