On Tue, Apr 29, 2008 at 01:18:10PM +0200, Peter Ankerstål wrote: > Im using a built in re(4) card and it seems like its causes data-corruption > as soon as it gets some load (or after a few hours online) > > The machine is running FreeBSD 7.0R: > > FreeBSD ninja 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Wed Apr 16 22:49:15 CEST > 2008 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/NINJA amd64 > > (using a RELENG_7 kernel updated today) > > > If I download alot of files with wget or something everything works fine > for a while until the download just stalls and tcpdump reports "bad cksum" > > 13:04:25.839408 IP (tos 0x0, ttl 64, id 23912, offset 0, flags [DF], proto > TCP (6), length 1500, bad cksum 0 (->f40a)!) host1.http > host2.53895: . > 115065:116513(1448) ack 1421 win 8326 <nop,nop,timestamp 2316944721 > 2174233192> > and so on > again and again until the connection times out.
tcpdump reporting "bad cksum" can occur due to TX/RX checksum offloading. Do you not see this message normally, but only when the problem begins? Have you tried turning off TX/RX offloading to see if the erroneous behaviour goes away? Have you tried disabling RFC1323 to see if that's actually what's responsible for the stalls you're seeing? sysctl net.inet.tcp.rfc1323=0 I'd recommend staying away from Realtek NICs. Pick up an Intel Pro/1000 GT or PT. Realtek has a well-known history of issues. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
