Re: NFS server not responding

Trond Myklebust
2003-11-28T16:56:35Z

>>>>> " " == Bogdan Costescu <bogdan.costescu@iwr.uni-heidelberg.de> writes:

> I also see something like 0.8-1% retransmissions and these
> messages on newly installed Fedora Core 1 on some cluster
> nodes, using default r/wsize (8192). As I'm using root-NFS, the
> node is quite useless when this situation happens. I'm sure

Huh? Why should a 1% retransmission make a noticable difference? Be
realistic: we're talking about a delay of 100ms on 1/100 requests...
I get ~2% retransmission rate when I do UDP loopback mounts without
seeing any problems at all: it still compares well to the same mount
using TCP.

Now it may be that the Fedora kernel has some other crap in it that is
screwing up interrupts & other such things (NAPI perhaps?). Has
anybody that is seeing these problems made a comparison with an
equivalent stock Marcelo kernel?

Cheers,
Trond