Very Poor NFS Client Performance

[JohnConnolly]

I have just installed a Linux (Red Hat 6.2) client on our LAN. NFS client performance is very poor - about one tenth of the speed of other unix (Nextstep) clients. I've tried changing rsize and wsize (1024, 2048, 4096 and 8192) but see very little difference. The NIC is a 3Com 905B

Any ideas?

John Connolly

 

[JohnConnolly]

After a lot of mucking about with nfs options, nic drivers etc., I've just discovered the whole problem was caused by a bad lan cable - anything up to 20% dropped packets. Should have remembered to check the easy stuff first! Sorry for the pointless question.

John

 

[fluid11]

It wasn't pointless at all. Sometimes we all forget to check the easy things first.

 

[krale]

One (abeit nasty) way to check this kind of stuff is to flood ping the server. When it doesnt reply, it adds a "." . Great way to check wired connections (or the server). Second way is to take a voltmeter and test all 8 strands ...

 

[JohnConnolly]

No, I suppose it wasn't pointless but I felt such a fool... I spotted the dropped packets by pinging the server with ping -s 8192. No dropped packets with the default but 8192 really killed it. By the way, lots of good info (except "check the cable" in

http://nfs.sourceforge.net/nfs-howto/performance.html

John