On 5 Feb 2019, at 13:12, Jason Tibbitts wrote: >>>>>> "JLT" == Jason L Tibbitts <tibbs@xxxxxxxxxxx> writes: > > JLT> I wonder, though; is that likely to be the root of the problem I'm > JLT> seeing? The commit description talks about this as a performance > JLT> regression, but I'm seeing a complete loss of NFS functionality. > > It turns out that 4.20.6 (which has the patch in question) does not > appear to solve my issue. At least, I've still had a few complete NFS > hangups on machines running 4.20.6 though I haven't had a chance to > closely inspect one yet. > > As before, any hints about how I could best debug this issue would be > appreciated. Hi Jason, you can enable the NFS and SUNRPC tracepoints to get a better idea of what the client was doing right before the hang or what the client is trying to do during the hang: echo "sunrpc:*" >> /sys/kernel/debug/tracing/set_event echo "nfs:*" >> /sys/kernel/debug/tracing/set_event Examine or provide the contents of /sys/kernel/debug/tracing/trace. Ben
