[mythtv-users] Sound jerkiness with latest RedHat kernel

[Calvin Gorriaran]

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I also have this same problem. I found if I DO NOT set...

  /usr/local/bin/test_ioctl -d /dev/video0 -c bitrate=2500000,bitrate_peak=8000000

the problem goes away. I have a 120gig drive so it is a fix for now, but not long...


Calvin





On Sun, Jun 08, 2003 at 06:02:04PM -0400, Flavio Villanustre wrote:
> Hi all,
> 
> I'm currently using kernel 2.4.20-18.9 from RedHat. Since the latest 
> kernel upgrade I started noticing choppy audio and playback slowly lagging 
> behind live TV (after about 20 minutes of live TV, it's about 2 minutes 
> behind).
> 
> I'm using a PVR250 with a Pentium IV 2.4Ghz. CPU usage is really low 
> (below 6% user time and below 4% user time). I'm using an ultra ATA ide 
> subsystem with a dedicated disk for the ringbuffer/store.
> 
> I've have DMA enabled and a few tweaks on the HD:
> /sbin/hdparm -X70 -c1 -W1 -A1 -a128 -u1 /dev/hdb
> 
> I tuned the elevator:
> /sbin/elvtune -r 2048 -w 4096 -b 0 /dev/hdb
> 
> And I reduced the bitrate of the PVR:
> /usr/local/bin/test_ioctl -d /dev/video0 -c bitrate=2500000,bitrate_peak=8000000
> 
> iostat results are:
> avg-cpu:  %user   %nice    %sys   %idle
>            5.00    0.00    4.00   91.00
> 
> Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
> /dev/hdb     0.00 142.00  0.00 36.00    0.00 1424.00     0.00   712.00    39.56 42949613.96    2.78  27.78 100.00
> 
> 
> However I had little success.
> 
> I've seen several messages posted to this mailing list complaining about
> RedHat kernels. Could anybody solve this? Is anybody using latest RedHat
> kernel without problems?
> 
> Thanks and best regards,
> 
> Flavio 
> 
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> 
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