Hello,
I am have tested with Sles9.1sp1, Sp3, and kernel.org 2.6.17.6 and
here are some results:
SLES9.1sp1 (kernel only) 100-120MB/second writes 75-80MB/second reads
SLES9.0sp3 20-30MB/second writes
2.6.17.6 20-30MB/second writes 140-150MB/second reads
This is with the LSI Logic / Symbios Logic FC929X Fibre Channel Adapter
(rev 81)
All 3 are with a SLES9sp3 distribution and are on the same machine with
only the kernel
being changed. The test is a simple "dd if=/dev/zero of=/dev/dk001/two
bs=65536 &"
with vmstat being used to determine io speed. Bonnie++ is getting
similar results
to what dd is generating when writing to a filesystem.
The fiber channel card is hooked to a external raid5 chassis, and it
being accessed
though LVM.
Are there some parameters that I am missing that could speed the writes up?
The reads on the newer driver are a nice improvement, but the writes on
the newer driver are horrible in my testing.
Roger
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