Re: [BUG REPORT] TCP/IP weirdness in 2.2.15

[Thomas Pollinger <tpolling@rhone.ch>]

Hi Stephen

>Let me see if I understand this correct:
>
>         Client  Router  Server
>         ------------------------------------
>         Linux   Linux   HPUX            Bad
>         WinNT   Linux   HPUX            Good
>         HPUX    Linux   HPUX            Good
>
>With all Linux boxes version 2.2.something
>
>Is this correct?

Yes, this is right.

>This is slightly different from my situation; I had a Linux client and
>Linux server directly connected to the same switch (3Com Superstack
>II, FWIW)

This is probably a configuration I'm going to try as well: put the cvs 
server on a linux box and have it communicate to different clients. 
However, the configuration I have now simply suggests that there cannot be 
a problem on the IP level as the Linux box as router is working as expected.


>Perhaps if I get time I'll repeat the experiment with (a) the most
>recent Alan pre-2.2 kernel and (b) the most recent 2.4-test kernel...
>
>I'll re-iterate my original request, which was not "it's broke - can
>you fix it" but was "okay, how do I go about tracking this one down?"

At this stage, I am uncertain of the cause of the problem. I am pretty much 
sure that the card, drivers and the IP level should work as expected. It is 
lilkely that there could be a problem with CVS which gets caught in a kind 
of deadlock - however, observing the TCP-packet communication and the 
system calls done by both CVS client and server shows always the same 
result (I put a printf before and after the read/recv call in the client):
         - The clilent is stuck in the read system call on the socket for 
reads and waits forever
         - The server gets EWOULDBLOCK notifications when writing to the 
socket and eventually goes
           to sleep
         - The last packages sent by the server will be resent roughly 
every 30-60 seconds.
           The client either responds no packages accepted or the last 
packages are accepted by the
           client but the system call still blocks.

Regards,
-Thomas

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