Very poor performance of NFS on version 4.51-beta1 when doing random access to a file on a USER share.
- Sequential access over NFS to USER share is perfect, and the Unraid CPU utilization is very low.
- Random access via NFS directly to the DISK share works perfectly as well.
When playing a movie (using Popcorn Hour) over NFS USER share, and trying to jump to a far location in the movie, the playback stutter.
The same movie works ok, when played from a DISK share on the Unraid.
I checked the Unraid CPU utilization using "top" and "vmstat". When the movie was stuttering remotely the Unraid CPU utilization was almost 100%.
Most of the CPU utilization was in the "wa: Time spent waiting for IO".