[mythtv-users] Horrendous RAID-6 performance
Billy Macdonald
billymacdonald at gmail.com
Mon Mar 31 03:53:46 UTC 2008
On Sun, Mar 30, 2008 at 7:24 PM, Yan Seiner <yan at seiner.com> wrote:
> John Drescher wrote:
> >> Could it be a tickless kernel problem? I just went through the kernel
> >> config and that's the only thing I can think of that looks vaguely
> >> unusual.
> >>
> >>
> > That is definitely possible and it could be causing an interrupt
> > problem causing poor disk performance. I would try building a kernel
> > with tickless off or use an older known working kernel.
> >
> Well, I just came back from a weekend trip.
>
> selene:/data/home/yan# hdparm -Tt /dev/md10
>
> /dev/md10:
> Timing cached reads: 2480 MB in 2.00 seconds = 1240.82 MB/sec
> Timing buffered disk reads: 770 MB in 3.01 seconds = 255.50 MB/sec
>
> no wait states, cpu usage is down to nothing....
>
See, a good vacation fixes all sorts of problems!
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