Re: NFS server not responding

Steve Dickson
2003-12-04T17:16:21Z

Trond Myklebust wrote:

>Nobody on this list is directly responsible for the Fedore Core 1
>kernel, ......
>
>
This not completely accurate.... I am responsible for FC1...
And it is my goal to keep FC1 (and beyond) as stable as possible...

>I have no problems on *any* of the machines in the test-rigs I have at
>my disposition when using a standard 2.4.23 kernel. For the record,
>those few that I have used with the Fedora kernel have been fine too
>(though I haven't made any detailed tests of that)
>
>
I not seen this either... FC1 does have the latest retrans improvements
# 03/10/11 trond.myklebust@fys.uio.no 1.1148.17.3
# UDP round trip timer fix. ...

# 03/10/11 trond.myklebust@fys.uio.no 1.1148.17.2
# A request cannot be used as part of the RTO estimation ...

# 03/07/08 trond.myklebust@fys.uio.no 1.1003.1.58
# Back out some congestion control changes that were causing trouble...

With the only difference being FC1 has a longer RTO_MIN
-#define RPC_RTO_MIN (HZ/30)
+#define RPC_RTO_MIN (HZ/10)

And these patches did show a noticeable improvement in bring down the
number of retrans at least in my testing (w/out being overly verbose)

>So now, what have you tried in order to diagnose this problem?
>
>
ifconfig will show if the driver is dropping frames. netstat -s will show
if there are udp fragmentation issues and ethereal is good at showing
whether the ip stack or network are dropping the packets....

SteveD.