[mythtv-users] Horrendous RAID-6 performance

[Billy Macdonald]

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!