NFS extremely slow - rsize/wsize not to blame

[Wim Godden]

Hi,

I have a weird NFS problem which is not due to bad rsize/wsize
parameters (tried all from 1024 up to 16384).

I have an NFS server running kernel 2.4.9 and an NFS client running
kernel 2.4.9. Both have NFS compiled into the kernel. Mounting is no
problem, but transferring files never goes faster than about
100KByte/sec, although the network is a 100Mbit/sec connection over a
switch (and there's no other traffic on the connections).

Any ideas what may cause this ?

Kind greetings,

Wim Godden

[Karl Heyes]

duplex mismatch between your switch and NIC. It will affect all protocols.
make sure the setting is the same for the NIC and switch.

karl.

[Wim Godden]

Both the NIC's and switch are set to full duplex. FTP is no problem at
all, running at 8MByte/sec.

[Karl Heyes]

In article <3B9CB7...@godden.net>, "Wim Godden" <w...@godden.net> wrote:

>> > Any ideas what may cause this ?
>>
>> duplex mismatch between your switch and NIC. It will affect all protocols.
>> make sure the setting is the same for the NIC and switch.
>
> Both the NIC's and switch are set to full duplex. FTP is no problem at all,
> running at 8MByte/sec.

run a tcpdump, see what is causing the delay, server/client?. Are you using
the async option on the server?

karl.

[Wim Godden]

How do I set async ?

Greetings,

Wim

[Karl Heyes]

In article <3BA345...@godden.net>, "Wim Godden" <w...@godden.net> wrote:

>> run a tcpdump, see what is causing the delay, server/client?. Are you using
>> the async option on the server?
>
> How do I set async ?

man exportfs

IIRC the file is /var/lib/nfs/xtab. Theres a howto on nfs.sourceforge.net

karl.