Messages in this thread | | | From | Stephen Hemminger <> | Subject | Re: Network slowdown from 2.6.7 to 2.6.9 | Date | Tue, 23 Nov 2004 10:04:50 -0800 |
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On Mon, 22 Nov 2004 15:38:16 -0800 Harry Edmon <harry@atmos.washington.edu> wrote:
> Tried them all - none of them helped. Use "ntop" I can see that my > throughput on the Intel gigabit ethernet interface on the system maxes > out at 15.2 Mbps with 2.6.9. With 2.6.7 it made it to 35 Mbps. > > Does anyone have any other suggestions as to what to look for to > diagnose this problem?
Well, before the TSO changes, if TSO was enabled then TCP would not obey slow start or do congestion control properly. Did you increase the TCP send/receive buffers (sysctl's net.ipv4.tcp_rmem and net.ipv4.tcp_wmem)? You may just be window limited. Also, 2.6.9 has TCP bugs with TSO that can cause panic's. These have been fixed in 2.6.10-rc2.
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