On 12/14/11 20:59, YongHyeon PYUN wrote:
AFAIK the firmware of controller has no known TSO issue so it
indicates a bug in driver.
What makes me wonder is ICMP ECHO packet should not be affected by
TSO and I have no clue at this moment.
I wasn't talking about ICMP ECHO.
What happened was:
a) the client connected to my server, advertising a TCP MSS of X;
b) my server started sending with packets larger than X (possibly it
misinterpreted MSS size???);
c) an ICMP packet arrived, asking my server to send packets no larger
than Y (I guess it was ignored);
d) my server kept resending the same (too big) packets;
e) it eventually reduced packet size, but it was still larger than Y;
...
Wireshark showed some wrong checksums (I believe on the ICMP packet, but
I might remember wrong).
Of course this made a bell ring and removing TSO solved everything.
(Here, I assume you've
captured packets on receiver side since bpf sees packets before
hardware computes checksum.)
Yes, although I don't have them anymore.
If you have a reliable way that reproduces the issue, let me know.
I can turn TSO on again, save the packets and send them to you.
I just hope nothing changes on the Internet in between the server and
the client.
Let me know if you need/want this and I'll arrange in the next few days.
bye & Thanks
av.
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