[mythtv-users] Horrendous RAID-6 performance

[Derek Stark]

I could try to quote all of this in-line, and probably fail...

Have you tried changing the tuning params listed here?
http://www.mythtv.org/wiki/index.php/LVM_on_RAID#Performance_Enhancements_.2F_Tuning

D.

On Fri, Mar 28, 2008 at 5:37 PM, Yan Seiner <yan at seiner.com> wrote:
>
>  John Drescher
>
> >>  Well, now that you mention it....  Nothing is using the system, but
>  >> it's
>  >>  still running at 67% wait states?  WTF?  What's it waiting for?  How do
>  >> I
>  >>  find the process that's waiting?
>  >>
>  >>  top - 15:18:08 up 2 days,  7:34,  2 users,  load average: 3.12, 3.66,
>  >> 4.23
>  >>  Tasks: 219 total,   2 running, 217 sleeping,   0 stopped,   0 zombie
>  >>  Cpu(s):  3.1%us,  1.0%sy,  0.0%ni, 28.7%id, 66.8%wa,  0.0%hi,  0.5%si,
>  >>  0.0%st
>  >>  Mem:   2062908k total,  2046844k used,    16064k free,    18712k
>  >> buffers
>  >>  Swap:  3903712k total,   574648k used,  3329064k free,   720916k cached
>  >>
>  >>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  >>   7137 motion    20   0  259m  12m  792 S    6  0.6 369:57.08 motion
>  >>   7376 root      20   0 1126m 100m  11m S    1  5.0  24:15.67
>  >> mythbackend
>  >>   7109 root      20   0  129m  50m 7148 S    1  2.5   4:21.79 Xorg
>  >>   4960 root      15  -5     0    0    0 S    0  0.0   4:34.77 bond0
>  >>   7399 root      15  -5     0    0    0 S    0  0.0   1:06.07 kdvb-fe-0
>  >>     1 root      20   0 10392  664  632 S    0  0.0   0:04.14 init
>  >>     2 root      15  -5     0    0    0 S    0  0.0   0:00.02 kthreadd
>  >>
>  >>
>  > What is the motion process? And do you see your system is using 574MB of
>  > swap?
>
>  motion is a motion detector program.  It monitors cameras and makes movies
>  when it detects motion.
>
>  I get no change to the waitstates even with motion and myth dead....
>
>  I'm not sure why the system is using that much swap.
>
>  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.
>
>  --Yan
>
>
>  --
>  Windows is like a canary in a coal mine, it's the first thing to die on
>  your network.
>
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