Date: Fri, 2 Apr 2004 18:07:42 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Sean McNeil <sean@mcneil.com> Cc: freebsd-current@freebsd.org Subject: Re: nfs server issues Message-ID: <20040403000742.GD49311@dan.emsphone.com> In-Reply-To: <1080949413.49158.27.camel@server.mcneil.com> References: <1080882894.5980.26.camel@server.mcneil.com> <20040402163353.GC6724@dan.emsphone.com> <1080940409.3711.1.camel@server.mcneil.com> <20040402215745.GB49311@dan.emsphone.com> <1080949413.49158.27.camel@server.mcneil.com>
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In the last episode (Apr 02), Sean McNeil said: > On Fri, 2004-04-02 at 13:57, Dan Nelson wrote: > > In the last episode (Apr 02), Sean McNeil said: > > > OK, here is a tcpdump. It is confusing. It looks like after the > > > first fragment is received it is looking up some bazaar IP > > > address.... > > > > > > 13:02:57.566952 free.mcneil.com.1360032988 > server.mcneil.com.nfs: 136 readdir fh 1002,54097/7890231 4096 bytes @ 0x000000000 (DF) > > > 13:02:57.567266 server.mcneil.com.nfs > free.mcneil.com.1360032988: reply ok 1472 readdir (frag 1645:1480@0+) > > > 13:02:57.567268 0.0.0.1 > 0.0.10.7: (frag 1645:4@1480) > > > > Weird. Is this at the server or the client? > > This is a client-side dump. Both server and client have MTU of 1500. > > Server side says: > > 15:37:44.292564 IP free.mcneil.com.851449566 > server.mcneil.com.nfs: 136 readdir fh 1002,54097/7890231 4096 bytes @ 0x0 > 15:37:44.292705 IP server.mcneil.com.nfs > free.mcneil.com.851449566: reply ok 1472 readdir > 15:37:44.292711 IP server.mcneil.com > free.mcneil.com: udp > > Is there something in a packet that tells rpc/nfs to reassemble with > something other than the source/destination info? Neither RPC or NFS are involved with fragmentation. That's all done at the UDP level. I wonder if it's a NIC problem. Can you try a different card (maybe even a different brand of card if possible)? another interesting test would be to get a hub and a 3rd machine, then do dumps with the hub on the server's port, and then the client's port. If you get garbled frags in both places, I'd lean toward a NIC problem on the server. If your card supports checksum offloading, try disabling it (ifconfig xx0 -rxcsum -txcsum). -- Dan Nelson dnelson@allantgroup.com
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