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Subjectknfsd 1.2.2 & 2.2.7-ac1 : slow readings
Hello,

I have installed the RH 6.0 and have updated the kernel to 2.2.7-ac1.

I am testing NFS with iozone.

The NFS server is doing rather well with one client (6,8Mo/s with a
2.2.7-ac1 Linux client, 7,3 Mo/s with a FreeBSD client for writing,
5,0 Mo/s during reading for Linux, 4,8 Mo/s for FreeBSD).

Unfortunately, when I run both clients at the same time, reading
performance drops drastically : 700 Ko/s each. During rereading,
the load of the server climbs between 3 and 4.

When I run two iozones locally on the server, I get 3,5 Mo/s on each
iozone (ie, the global rate is around 7 Mo/s, which is consistent).

So, to summary :

1) 1 NFS client : ~ 7 Mo/s writing, 5 Mo/s reading
2) 2 NFS clients: ~ 7 Mo/s writing, 1,5 Mo/s reading (cumulated)

3) 1 local client : ~ 9 Mo/s writing, 7 Mo/s reading
4) 2 local clients : ~ 9 Mo/s writing, 7 Mo/s reading. (cumulated)

Where can the problem (1,5 Mo/s) be ?

A +,
--
Thierry Danis

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