[email protected] wrote: > At 10:23 PM 3/20/2009, Tom Metro wrote: >> On the other hand, until I tweaked my back-end to run its monthly >> RAID rebuilds at a lower priority, I'd see persistent "starving >> buffer" problems for the duration of the rebuild. As another poster >> mentioned, poor disk I/O performance can lead to these symptoms. > > Given that it runs for several hours sometimes with no issues it > would seem odd it would be a disk IO problem. The buffer pretty much > just sits there full until I start to see problems, and no amount of > stopping the video resolves the problem. Pause will refill the > buffer, but once unpaused it almost instantly empties. Once it's > stuttering it doesn't recover. (at least over intervals of a half > hour or so, which should clearly resolve a buffering problem. > > The system is WD Green Caviar drives, non-RAIDed. One single drive is > used exclusively for Myth. I get no SMART issues, or errors in > /var/log/messages. > > If you have pointers for debug beyond what I've posted so far I'd > appreciate any insights. > > Rick > >
If something were running on the drive (a cron job, a big copy) that would explain the behavior. And rebooting would "FIX" it since it would kill the job. On mine I have some jobs that copy around large files a couple of times a day, those jobs did not cause stuttering...they completely stopped the mvpmc until the job finished. I finally went in and used rsync with a -bwlimit option to limit how hard it hits the disk. Since the mvpmc had very small buffers it cannot tolerate it taking very long for data to get to it, so is very sensitive to io delay on the backend. ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Mvpmc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mvpmc-users mvpmc wiki: http://mvpmc.wikispaces.com/
