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? > > - I've been doing a bit of research on this.
I too had problems with stuttering on moving to 0.3.3. I noticed it was especially problematic when there was other traffic. througput tests gave me 6-8 mb/s at best, often 1-2 mb/s. My network also consists of a master backend, slave back/frontend. I'd recently upgraded the slave from RH9 to FC5 (mythdora). Tried a number of different rsizes - from 1024 - 4096. I discover this doc http://www.netapp.com/library/tr/3183.pdf Since then I've used this setup firebird:/home/video/myth-video /video nfs rw,v3,rsize=4096, wsize=4096, hard,tcp,nolock,addr=firebird 0 0 Note 2 differences - rsize=4096 and crucially tcp (rather than udp). whilst udp is more effiicient, tcp is much better on congested and multi-speed networks. With these settings I get consistent 13mb/s. I'd like to propose we change nfsmount. -malc- p.s. I have an original MVP. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Mvpmc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mvpmc-users mvpmc wiki: http://mvpmc.wikispaces.com/
