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Bug #1923

Abysmal NFS performance with IPv6

Added by ftigeot almost 10 years ago. Updated almost 10 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
Due date:
% Done:

0%

Estimated time:

Description

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.

History

#1

Updated by ftigeot almost 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 <>:
>
> 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.

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