On Wed, 2007-06-20 at 19:06 -0400, Jeff Garzik wrote:
> Carlo Wood wrote:
> > hdparm -tT gives over 160 MB/s for my tripple 10k rpm Raptor RAID5
> > on 2.6.18, as expected.
> >
> > In 2.6.22-rc5 this dropped to only 60 MB/s !
> >
> > Is this a known issue?
> >
> > I also measured it with bonnie; I get 108 MB/s reading speed on
> > 2.6.18 and only 68 MB/s on 2.6.22-rc5.
>
> More info needed... kernel config, before-and-after dmesg output, lspci
> output.
also do a
echo 60 > /proc/sys/vm/dirty_ratio
first to see if that helps
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