Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Coming late in this thread, I too (just recently) identified problems with drbd on HP DL385 machines with Broadcom NICs. The problem is easily repeatable even on minimal install: just enable xinetd chargen on one machine and suck data from it from the other (something like nc <ip> 19 > /dev/null) and watch iptraf -d on that interface on sending machine. IP checksum error counter goes up at about 10% rate of the packet count. The thing one has to turn off with ethtool is not ip checksum, but tcp segmentation (ethtool -K eth1 tso off). This is what is really making problems. I confirmed it on 1.4.43, 1.4.52d and 1.5.11-rh version of the driver. In january, when I come back to work, I'll repeat tests with 1.6.7 to see if it makes any difference. IMHO it's a shame that neither Broadcom nor HP/Dell did not find such problem in their QA tests and released such broken NICs to the market. -- Jure Pečar http://jure.pecar.org/