On Sun, 21 Jan 2007, Max Laier wrote: > On Sunday 21 January 2007 13:25, Bruce Evans wrote: > > On Sun, 21 Jan 2007, Max Laier wrote: > > > On Sunday 21 January 2007 07:25, Bruce Evans wrote: > > >> nfs writes much less well with bge NICs than with other NICs (sk, > > >> fxp, > > > > > > Do you use hardware checksumming on the bge? There is an XXX in > > > bge_start_locked() that looks a bit suspicious to me. > > > > I use the default for that. Wouldn't checksum problems show up as > > errors somwhere? > > Did you look at the code in question? It is concerned with fragmented > packet chains (which NFS over UDP usually generated) and only commits to > sending them, if there are enough descriptors available at once. This > can easily explain burstyness. > > Can you just try to disable the delayed checksums via "ifconfig -txcsum"? > Should be an easy enough test. >
I realize that Bruce has already identified the problem as being with the cabling, however I wanted to add a warning that disabling hardware checksums for bge cards is not a good idea. You can find my analysis of data corruption bugs caused by using bge cards without checksum offloading in the archives: http://lists.freebsd.org/pipermail/freebsd-net/2004-January/002530.html Kelly -- Kelly Yancey - [EMAIL PROTECTED] | [EMAIL PROTECTED] _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
