Jody Steadman wrote: > Hi All, > > When try to connect to the sites > http://www.stiftung-warentest.de/online/ and http://www.bosch.de, I get > DUP ACKs in the session and it never completes. > > At first, I thought it was either a site or an upstream provider > problem. I tried from other locations outside my company and other > machines within the company. Everything works fine. > > I ran a tcpdump on the connection and noticed the DUP ACKs and started > trying different things suggested by mailing lists, etc. I tried > changing the MTU and congestion algorithms. Nothing worked. > > I enabled timestamping so I could an idea of the time span. The > connection completed, but was really slow. The DUP ACKs are still > present in the dump when timestamping is used, but I'm not sure why > timestamping would make a difference. Maybe someone can point that out? > > What prompted me to send a message to this list is the fact it worked on > an earlier kernel version, but not on the newer ones. > > Here is the dirt from the tcpdump and my config. I'm happy to provide > any additional information. Any help would be greatly appreciated. Things to try can be: tcp_abc = 0 tcp_sack = 1 and disable TSO with: ethtool -K eth0 tso off You can try them all and see if it helps, if it does it would be useful if you could narrow it down. It's a bit hard to read the current tcpdump, could you send me (in private) a copy of the raw tcpdump file? Baruch - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
