From: "Ristuccia, Brian" <[EMAIL PROTECTED]> Date: Wed, 25 Apr 2007 16:11:51 -0400
> > I'm seeing a > > problem where the kernel attempts to send packets with a MSS > > larger than the one negotiated when the TCP connection is > > established. Even after ICMP "can't fragment" messages > > arrive, the kernel still attempts to increase the MSS rather > > aggressively. The end result is extremely poor throughput > > when sending to a network with a smaller MTU. > > I've tracked this problem to the TSO feature in the bnx2 driver. Turning > off TSO with "ethtool -K eth1 tso off" seems to work around the problem. > It appears that the bnx2 device is not using the correct mss when > performing segmentation offload. Thanks for narrowing it down like that. Michael can you have a look? Is the bnx2 firmware using the MTU setting in the device and ignoring the passed in MSS or something like that? Thanks. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
