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SubjectRE: Production comparison between 2.4.27 and 2.6.8.1
Date
Nick Piggin Wrote:
> I wouldn't worry too much about hdparm measurements. If you
> want to test the streaming throughput of the disk, run dd
> if=big-file of=/dev/null or a large write+sync.
>
> Regarding your worse non-RAID XFS database results, try
> booting 2.6 with elevator=deadline and test again. If yes,
> are you using queueing (TCQ) on your disks?

Done another test.
This time I created a 256Mb ramdisk, formatted it as ext3 and mounted as
data partition.

Results are the following:
2.6.8.1:
A)
real 0m0.437s
user 0m0.036s
sys 0m0.013s

B)
real 0m37.307s
user 0m3.212s
sys 0m1.287s


2.4.7:
A)
real 0m0.437s
user 0m0.024s
sys 0m0.010s

B)
real 0m38.180s
user 0m2.950s
sys 0m1.602s


In this case results are comparable.
What is the difference, so?
2.6 performs better reading from disk.
Avoiding PCI, SATA and disks on this test makes 2.4 and 2.6 perform in
the same way.

Hope this helps.

Massimo Cetra




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