On Thu, Feb 08, 2001 at 12:47:39AM +0100, Andrea Franceschini wrote:
> > > All this started after i upgraded my kernel in order to support UDMA/66
> > > devices.
> > >
> > > Using Previous kernel disk/raid performance was not so fast (~10MB/s)
> > > but neither so slow!!

Ok, could you try to limit your IDE disks to UDMA mode 2 instead of 4 ?
This is with 'flags 0xa00' for each of your wd entries in kernel config file.

I'm not conviced I got the VIA Ultra66 stuff rigth :(

> This is my raid configuration:
> 
> START array
> 1 4 0
> 
> START disks
> /dev/wd0e
> /dev/wd2e
> /dev/wd1e
> /dev/wd3e
> 
> START layout
> 32 1 1 5

You may want something larger than 32 here, This mean 16k blocks read/write to
the disk. You'd want something larger - 64 or 128 - to decrease the interrupt
load and increase the IDE bandwith.
The effect of this can be more important at Ultra/66 than Ultra/33.

--
Manuel Bouyer <bouyer@antioche.eu.org>
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