Messages in this thread | | | Date | Tue, 18 Jul 2006 12:30:30 -0500 | From | Roger Heflin <> | Subject | newer MPT speed issue on Linux |
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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.
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