On Mon, 10 Jun 2002, Thomas McLaughlin wrote: > Thanks for the reply. > I have now tried turning on NFS debugging as suggested and ran tcpdump > but this did not seem to give any info on the problem. The logs entries just > stopped without any errors or looked like the file had copied ok with status > set to ok. I can see from the tcpdump output that packets are fragmented > when I user a buffwer size of 4096. > There is nothing even obviousy different in the log files/tcpdump output > when the copy does work (using a buffer size of 1024). In fact I can sometimes > copy my test file once when I first restart nfs using the higher buffer size > and then I get the error each time I try and copy.
Hmmm, could you put the logs + tcpdumps on a web page somewhere so I can have a look at them? Preferably logs where the transfer works, and ones where it fails. > It has been suggested that that it could be a problem with one of the network > cards/packets so should I not have seen problem with other applications such > as ftp (which is ok)? Does this use a smaller packet size? Sometimes. ftp uses TCP, which tries to fill packets for bulk transfer of data. However (by default) it wont cause IP fragmentation. There are also issues around slow-start and congestion avoidance, for example, which limit the maximum transfer initially. But transferring any half-decent sized files should "open the window" (ie get full available bandwidth). > Both machines are running Mandrake 8.2 with no firewall software running > however my machine is running vmware and jabber daemon but does not > appear to be causing problems. AFAIK, vmware does have its own network driver, which does some clever packet "injects" tricks. If possible, I'd try running without vmware, but I doubt its the culprit here. Paul. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Particle Physics (Theory & Experimental) Groups Paul Millar Department of Physics and Astronomy [EMAIL PROTECTED] University of Glasgow [EMAIL PROTECTED] Glasgow, G12 8QQ, Scotland http://www.astro.gla.ac.uk/users/paulm +44 (0)141 330 4717 A54C A9FC 6A77 1664 2E4E 90E3 FFD2 704B BF0F 03E9 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -------------------------------------------------------------------- http://www.lug.org.uk http://www.linuxportal.co.uk http://www.linuxjob.co.uk http://www.linuxshop.co.uk --------------------------------------------------------------------
