Re: Interesting TCP issue

On Jan 22, 9:15, Uwe Doering wrote:
} Subject: Re: Interesting TCP issue
} Steve Watt wrote:
} > In <459AD141.5010502@xxxxxxxxxxxx>, Julian Elischer wrote:
} >
} > [ Snip discussion of symptoms of window scaling broken when
} > talking to at least the skype mail servers. ]
} >
} >> we have seen this since 4.x
} >> I think a fix may be in 7.0 but I'm not sure..
} >> I thin kthere is a problem when the far end sets the window down to 1
} >> but scales it by a factor of 2^{big number}.
} >>
} >> Andre, can you check out this problem and MFC the correct fix
} >> if it is indeed the same problem in 6.2?
} >
} > It is the same problem; I took the (one-line) fix as indicated by
} >
} >> http://cvs.ironport.com/cgi-bin/viewcvs.cgi/freebsd/src/sys/netinet/tcp_syncache.c.diff?r1=1.84&r2=1.85
} >
} > (well, not cvs.ironport.com, which doesn't seem to exist at the moment),
} > and applied the diff from 1.84 to
} > 1.85 and to a 6.2-PRERELEASE box updated around 25 Dec 06.
} > It works like a charm.
} >
} > I would vote to MFC 1.85 now that 6.2 is out.
}
} I wonder whether it is that easy. As far as I can tell the commit to
} HEAD actually comprised changes to three files:

I wonder as well, but that single diff fixes the problem I was running
into with the skype mail servers.

} http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/tcp_input.c.diff?r1=1.290&r2=1.291
} http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/tcp_syncache.c.diff?r1=1.84&r2=1.85
} http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/tcp_var.h.diff?r1=1.127&r2=1.128
}
} How about the modifications in 'tcp_input.c'? Are they relevant to the
} problem this thread is about? If so, assessing the correctness of an
} MFC might prove to be a little harder.

Looking at it, yeah, those probably need to be picked up in some form as
well. I didn't look closely at the tcpdump after, only observing that
it worked where it didn't before.

Hmm.

--
Steve Watt KD6GGD PP-ASEL-IA ICBM: 121W 56' 57.5" / 37N 20' 15.3"
Internet: steve @ Watt.COM Whois: SW32-ARIN
Free time? There's no such thing. It just comes in varying prices...
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Relevant Pages

  • Re: Interesting TCP issue
    ... }> talking to at least the skype mail servers. ... can you check out this problem and MFC the correct fix ... but that single diff fixes the problem I was running ... assessing the correctness of an} MFC might prove to be a little harder. ...
    (freebsd-net)
  • Re: Interesting TCP issue
    ... } Steve Watt wrote: ... can you check out this problem and MFC the correct fix ... but that single diff fixes the problem I was running ... assessing the correctness of an} MFC might prove to be a little harder. ...
    (freebsd-net)