NFS latency/locking(?) problems

Nullity · Jan 31, 2017, 8:23 PM

(I doubt it's a pfSense problem.)

I'm new to NFS but I've read everything I can find.

My problem is that when I saturate my 100Mbit NFS link with an NFS file transfer then try to "ls" the target directory it occasionally lags up to 20 seconds before listing the directory. I tried lowering the block size down to 1K and it did kinda lower the lag to 3 seconds but that still seems way too high. The throughput is fine.

Server is Ubuntu 16.04.1 LTS
Client is ArchLinux.
NFSv4
TCP

Any help is appreciated.

Harvy66 · Feb 1, 2017, 5:38 PM

All over LAN or WAN traffic?

Nullity · Feb 1, 2017, 7:24 PM

@Harvy66:

All over LAN or WAN traffic?

All LAN.

Oh, I forgot to mention that pings and all other services still have normal latency (< 1ms) during link saturation. It's just NFS that lags.

Harvy66 · Feb 2, 2017, 1:15 PM

Could Nagle on the client or server be creating an artificial 100ms delay? Even then, you'd think it would be a common issue.