Hello.
We have a NFS server which used to run Suse 9.1. Since it was upgraded
to Suse 10.1, it is _very_ slow (nearly unusable for some things). In
particular loging in with KDE in a client PC can take a long time. I
have measured 5 minutes(!) from entering the password to the desktop
appearing instead of the more usual 15-20 seconds.
I now suspect that the problem is with locks since it doesn't seem to
affect everything in the same way.
Some info about our environment:
- the server is a dual processor running kernel 2.6.16.27-0.9-smp
in 64 bit mode.
- the server has 4 SATA disks, configured in 2 RAID-1 arrays, each
one with one ext3 file system. These file systems are the ones
being exported.
- the options in the /etc/exports file are (rw,sync)
- there are some tens of clients with various versions of Suse Linux
(from 10.0 to 10.2). In particular 2 classrooms with 16 computers
each. When 16 students login at the same time, it takes minutes
for kde to start (waiting for file locks ?).
- the network between the server and many of the clients (including
those 2 classrooms) is gigabit ethernet.
- in a client:
# cat /proc/mounts
server:/fs /fs nfs
rw,v3,rsize=32768,wsize=32768,hard,tcp,lock,addr=server 0 0
# netstat -in
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP
TX-OVR Flg
eth1 1500 0 173408 0 0 0 95072 0 0
0 BMNRU
- in the server
# netstat -in
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP
TX-OVR Flg
eth0 1500 0514961025 0 0 0736413957 0 0
0 BMRU
- so, there are no network errors, NFS v3 over tcp is being used and
read and write sizes are 32KB.
Two questions:
1 - Is someone using a Suse 10.1 as a NFS server without problems ?
Do you have a comparable number of clients ? Are you using a SMP kernel ?
2 - Any suggestions about what could be the problem ?
I tried several things to diagnose the problem:
1 - booting again in 9.1 solves the problem. This points strongly to some
problem with 10.1, not a network problem or something outside the server.
2 - we had a problem with quotas not working in 9.1, so I tried to turn off
quotas in 10.1, to see if that was the cause. No change.
3 - I wrote a simple script to test the NFS speed (just some reads and writes).
There was some difference, but not dramatic (10.1 was maybe 1.5x slower than
9.1, not 10x slower).
As I have several servers which are not currently very busy I setup some
users that differ only in which server they are using (9.3, 10.1 or 10.2).
With both 10.1 and 10.2 I was able to recreate the problem. Loging from
4 PCs at the same time it took 1:30 or 1:40 for KDE to start instead of
16 to 20 seconds it took using the 9.3 server. I have just repeated
those tests and I got consistent results.
The 4 clients PCs are running Suse 10.0.
The options used in the mount are the same:
s10.1:/home/s10.1/d1 /home/s10.1/d1 nfs
rw,v3,rsize=32768,wsize=32768,hard,tcp,lock,addr=s10.1 0 0
s10.2:/home/s10.2/d1 /home/s10.2/d1 nfs
rw,v3,rsize=32768,wsize=32768,hard,tcp,lock,addr=s10.2 0 0
s9.3:/home/s9.3/d1 /home/s9.3/d1 nfs
rw,v3,rsize=32768,wsize=32768,hard,tcp,lock,addr=s9.3 0 0
Thanks in advance
--
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