Right now (with I believe an older MVPMC) I am using 20061223 with
2048 size on NFS and not having any stuttering issues, I was having
issues before with a size of 4096.
I would telnet into one of the boxes and check the error counts
with ifconfig and see if the errors are rising when you have the
stuttering going on, that was what I saw on mine when the blocksize
was 4096.
I am able using cat to get about 1.5MBytes per second or around
12Mbits/second, the highest stream that the mvpmc hardware
will decode is advertised as 12Mbits per second, what is the
bit rate of the streams giving you trouble (how close is it
to the 8.5mbits/second that you can get across the network?).
I tested with 3.3 just now via "time cat filename > /dev/null"
and get a speed on mine of about 12Mbits/second with 0.3.3,
is this a similar test to what you used?
doing "cat /proc/mounts" my nfs mounts look like this:
10.1.1.1:/video /video nfs
rw,v3,rsize=2048,wsize=2048,hard,udp,nolock,addr=10.1.1.1 0 0
Roger
Jeff McCarty wrote:
> I've been having sporadic problems with mvpmc skipping and stuttering
> for the past several months, and finally took some time to investigate.
>
> I've found that the maximum throughput for NFS mounted volumes
> dropped significantly for me, from about 13mb/s to 8.5mb/s, when
> updating from v0.3.0 to 0.3.1. Upgrading to 0.3.2 and then 0.3.3
> didn't improve performance any.
>
> Unfortunately, I also updated MythTV from 0.19 to 0.20 when 0.3.1
> came out, so I can't go back.
>
> I've been using the nfsmount.sh script to mount my nfs volumes, but
> tried manually setting the rsize to 1024, 2048, or 4096 without any
> improvement. I've also tried the --rtwin 4096 flag on the mvpmc
> executable without any improvement.
>
> I've got tons of DVD's ripped to mpeg2 streams with mp2 audio that
> used to play flawlessly. When I watch the buffers during playback, I
> see them empty very quickly, and never seem to fill back up, even
> when the throughput drops well below 8.5mb/s.
>
> MythTV streams seem to be OK if I use the myth protocol, but mounting
> the recordings directory via NFS runs into the same problem.
>
> Are there any other things I can try adjusting to get a speed boost?
> Is 8.5mb/s typical with the current version of mvpmc?
>
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