Abysmal NFS performance with IPv6
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.
Updated by ftigeot about 10 years ago
On Thu, Nov 25, 2010 at 01:16:16PM +0000, Francois Tigeot (via DragonFly issue tracker) wrote:
> New submission from Francois Tigeot <firstname.lastname@example.org>:
> I have recently setup a NFS share with IPv6 addresses on a gigabit lan. The
> performance is abysmal: 500 KB/s max.
This issue is not NFS-specific: the same performance gap can be seen when
copying files with rsync/ssh between LAN machines.