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Forum Discussion
Pro Pioneer NFS performance problem
For as long as I've had it I've been using NFS on the Pro Pioneer to serve video files to various media players in my house (a Dune HD Base 3.0, a TViX 4100, a Popcorn Hour A-100) with excellent results and no performance issues.
Abruptly, for no reason that I can determine, video files served over NFS by the ReadyNAS are unplayable on any of the media players. Playback stutters and freezes, with multi-second pauses between frames--that's when playback starts at all. This behavior is the same on all three of the media players that are using NFS. Yet the same files served from the Pro via ReadyDLNA (to a PS3) play back perfectly, with no stuttering or any other problems, suggesting that network performance is not an issue.
Nothing has changed in the ReadyNAS configuration as far as I can tell, nor in the configuration of any of the media players. The Pro has six Seagate 2 TB drives configured as X-RAID2, and the SMART status displayed by Frontview shows no disk errors on any of them. The array is 60% full.
I've rebooted the ReadyNAS multiple times without any effect on this performance problem, and I also just updated to the latest 4.2.20 beta (T19) just in case (since the release notes mentioned an NFS enhancement), but the playback stuttering persists.
How can I troubleshoot this further? The ReadyNAS is almost unusable in this state.
Abruptly, for no reason that I can determine, video files served over NFS by the ReadyNAS are unplayable on any of the media players. Playback stutters and freezes, with multi-second pauses between frames--that's when playback starts at all. This behavior is the same on all three of the media players that are using NFS. Yet the same files served from the Pro via ReadyDLNA (to a PS3) play back perfectly, with no stuttering or any other problems, suggesting that network performance is not an issue.
Nothing has changed in the ReadyNAS configuration as far as I can tell, nor in the configuration of any of the media players. The Pro has six Seagate 2 TB drives configured as X-RAID2, and the SMART status displayed by Frontview shows no disk errors on any of them. The array is 60% full.
I've rebooted the ReadyNAS multiple times without any effect on this performance problem, and I also just updated to the latest 4.2.20 beta (T19) just in case (since the release notes mentioned an NFS enhancement), but the playback stuttering persists.
How can I troubleshoot this further? The ReadyNAS is almost unusable in this state.
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StephenB wrote: russrtw wrote: It's been my understanding for years that flow control produces more undesirable results on average.
I've seen that posted, but in my experience it is not true. Packet Loss results in a steep decline in TCP speeds, which can destroy performance. I discovered that when streaming HD video to my NTV550. With flow control off, there was a lot of stuttering. Turning on flow control immediately solved the problem.
Perhaps, but note that in this case it was NFS performance over UDP (not TCP) that was poor until flow control was enabled. There was no noticeable problem with NFS over TCP.
But I didn't run any NFS performance tests apart from video streaming (which behaved adequately with either setting).- In my case, the NTV550 is 100 mbit, so the switch is downspeeding. Without flow control, it was running out of buffering (I guess because the sliding window exceeded the buffering).
In any event, turning on flow control solved both our problems.
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