[xfs-masters] [Bug 14208] XFS 5x slower than other filesystems when used as /var/tmp

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=14208





--- Comment #7 from Török Edwin <edwintorok at gmail.com>  2009-09-22 19:12:26 ---
(In reply to comment #6)
> Well with the truncat case xfs spends a lot of time writing files, at only
> ~8-10Mb/s,

most of which is writing to the log (the log is contigous, why isn't it writing
faster?), and much slower in the actual data (maybe because there isn't much
actual data written): 500Kb/s.

> sda               0.20         0.00         0.10          0          0
> sdb               0.20         0.00         0.10          0          0
> sdc             131.80         0.00       535.20          0       2676
> sdd               0.80         0.00         4.80          0         24
> sde               1.00         0.80         4.80          4         24
> sdf             132.00         0.00       536.00          0       2680
> sdg             131.20         0.00      8396.80          0      41984

sdg is the drive holding the log.

This disk can do 80Mb/s sustained write speed (by using dd):
sdg             156.80         0.00     80281.60          0     401408

I would have expected log I/O to be about 40-60Mb/s, but its 8Mb/s.

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