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Slow NFS Performance
We moved our office a few weeks ago, and as part of that move, re-ip'd the whole environment from a 10.0.0.x range to a 192.168.0.x range.
Since then, we've had performance issues on Solaris, AIX, and HP-UX NFS clients. Our linux clients are as well-behaved as they ever were.
We get a lot of RPC timeouts, and very slow performance on the NFS mounted directories. Have tried playing with vers=2/vers=3 and tweaking the wsize/rsize params, but so far, no luck.
Looking for any suggestions or ideas... Since the linux environments remain fast, I think we can safely rule out a network or hardware issue, so I'm thinking it's on the nfs clients themselves.
netstat -i shows no collisions on the interfaces themselves.
nfsstat from the client shows a lot of badcalls and badxids:
# nfsstat -rc
Client rpc:
Connection oriented:
calls badcalls badxids timeouts newcreds badverfs timers
27347 2599 537 2563 0 0 0
cantconn nomem interrupts
0 0 17
Connectionless:
calls badcalls retrans badxids timeouts newcreds badverfs
9 1 0 0 0 0 0
timers nomem cantsend
6 0 0
Finally, a truss of a cp from an NFS mount to local disk on the client hangs on the following line:
write(4, 0xFE800000, 8388608) (sleeping...)
We have a fairly heterogenous environment, and the NFS servers in question are a linux-based Snap Server, and a stock Solaris 8 box with clients running linux, solaris, HP-UX, and AIX. None of these issues were present in the old environment, and the linux clients are all still happy.
Looking for any ideas...
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Answers
Doesn't look limk PMTU issues:
# ping -sn nfsserver 9000
PING nfsserver (192.168.0.50): 9000 data bytes
9008 bytes from 192.168.0.50: icmp_seq=0. time=2.96 ms
9008 bytes from 192.168.0.50: icmp_seq=1. time=2.53 ms
...
----nfsserver PING Statistics----
13 packets transmitted, 13 packets received, 0% packet loss
round-trip (ms) min/avg/max/stddev = 2.52/2.565/2.96/0.120
Max size, non fragmenting is 1472 (standard MTU of 1500 less the 28 byte header).
Packets larger than that don't go.
C:\ping -l 1473 -f wise
Pinging wise [192.168.0.50] with 1473 bytes of data:
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Ping statistics for 192.168.0.50:
Packets: Sent = 2, Received = 0, Lost = 2 (100% loss),
did you reset *all* switches (see http:#16417635)
another reason might be a routing problem, check with traceroute from both ends
Can someone shed some light on this? I flipped the interface on one of the nfs servers to the other nic on the assumption that we might have a bad nic.
It autonegotiated to 100-half-duplex (this is a Solaris 8 box) and things suddenly got a lot faster.
This box is plugged directly into a Cisco Catalyst 2950 XL switch... which should talk 100fd, but I can't argue with the results.
Why would 100hd be faster in this case when plugged into a switch?
hmm, sounds like the auto-negotation failed
try to install Ethtool http://freshmeat.net/redir
Catalyst always had serious problems with NWay. Install firmware newer than netcard or force both ends to same media/duplex.
- TCP Previous segment lost -> duplex prob
- TCP Dup ACK -> duplex prob
- TCP Retransmission -> duplex prob
- TCP Out-of-order -> normal work
- TCP Window Update -> normal work
bad checksums would note wire problem or node netcard checksum processor problems
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by: gheistPosted on 2006-04-08 at 08:44:27ID: 16407648
Maybe some TCP extension recently implemented in Linux, or PMTU blackhole.