[issue1923] Abysmal NFS performance with IPv6

[Francois Tigeot (via DragonFly issue tracker)]

New submission from Francois Tigeot <ftigeot at wolfpond.org>:

I have recently setup a NFS share with IPv6 addresses on a gigabit lan. The
performance is abysmal: 500 KB/s max.

Both server and client are running DragonFly-2.8.2/x86-64

The same machines on the same lan have no trouble reaching tens of
MB/s with IPv4. Disk speed becomes the limiting factor.

Time spent copying some big files from the server to a local disk:

v4: sent 86109382 bytes  received 31 bytes  24602689.43 bytes/sec
v6: sent 49660678 bytes  received 31 bytes  266277.26 bytes/sec

All mounts were using tcp.

IPv6 transfer speed is about 100 time slower than IPv4.

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messages: 9349
nosy: ftigeot
priority: bug
status: unread
title: Abysmal NFS performance with IPv6

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