Very good results with 2.4.12 on a Dell PowerEdge 2550/PERC 3SI Raid

[Chris Chabot]

Hello All,
I just installed linux kernel 2.4.12 on some test PowerEdge 2550 boxes,
with a PERC 3/Si Raid card (4x 10krpm scsi u160 disks, 128Mb cache,  one
raid5 volume, using domsch/adaptecs aacraid driver).

Previously (using 2.4.2 & 2.4.9) the raid volume had a very disapointing
read spead of around 22 Mb/sec (a single disk is faster!). You can
imagine my suprise when i installed 2.4.12, and the read speed went up
to around 60 Mb / Sec ! 

I tested this speed increase with hdparm, bonnie+, and various 'real
life' applications, and it truely is a lot, i repeat _a lot_ faster for
me.

I don't know what changed in the block layer between then and now, but
please don't change it back ! ;-)

	-- Chris Chabot