Very low disk read performance on 5.x ( was Very low disk performance Highpoint 1820a )

[Steven Hartland]

Ok thanks for that kama good to have some comparison with 4.x
I've changed the subject as this seems definitely like a more generic
issue something that needs to be fixed before 5.4 release?

----- Original Message ----- 
From: "kama" <kama at pvp.se>
> 
> I have just tested on my system between 4.11 and 5.4. Both uses the same
> configuration on the write disk. its a RAID1+0 on Compaq SA6404 (ciss)
> running UFS1. The write to disk is similar on 4.11 and 5.4, but the read
> is 100% slower on 5.4 than 4.11. the R:W condition on 4.11 is 1:1 and on
> 5.4 2:1.
> 
> I have tested this with dd and my own written disktest program. The
> results on both program is similar. so it isn't dev-null issues.
> 
> I have tested with both 1GB files and 10GB files. 1GB files where really
> fast on reading, but i consider them false due to the RAID cache.
> 
> Something is really wrong here...



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