Date: Fri, 25 Nov 2011 09:51:25 +0100 From: Raul <raul@turing.b2n.org> To: freebsd-stable@freebsd.org Subject: Re: TCP Reassembly Issues Message-ID: <4ECF570D.4070105@turing.b2n.org> In-Reply-To: <1A5B3A48-7DF3-4018-A244-152BDE96299A@lassitu.de> References: <CAPNZ-Wq38=F3o2hYuYF_unBj3SZQ52XhVhdcwQ8PE_vU9xc2YA@mail.gmail.com> <CABLqceRyohFFYtdnW%2Bt%2B63kwk00cbkJVz3oXWqrR=xijkg14CA@mail.gmail.com> <4ECE9914.6020502@turing.b2n.org> <CAPNZ-WrQdjFEErt6K1uEndSc082q8Q48VHvtbP=5cNXFw7H7Rg@mail.gmail.com> <1A5B3A48-7DF3-4018-A244-152BDE96299A@lassitu.de>
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El 24/11/2011 23:06, Stefan Bethke escribió:
[....]
> I regularly copy large files off my Tivo trans-atlantic (125ms RTT),
> and TCP connections currently stall after about 500 megs, never
> recovering. I suspect this is connected, as it started immediately
> after upgrading the machine to 9-stable.
I've not seen not recovering nor completely stalled (mpd tcpmssfix
related?).
What I see is a normal start, normal bandwidth increase, peak
performance using all available bandwidth and after that bandwidth drops
to a 'unreasonable' level and stay there most of time during transfer.
Numbers always depend on too much factors, but to illustrate how
dramatic it is:
[....]
%ping -c100 XX.au
PING XX.au (136.186.XX.XX): 56 data bytes
...
100 packets transmitted, 100 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 352.036/354.258/374.731/3.593 ms
[....]
downloading by ftp an iso image from that host (wget), transfer peaks at
about 1.4MBytes/sec before falling up to 2,9?KBytes/sec where most
transfer happens.
Please note, this numbers come from a pppoe link (DSL) established by
mpd55 with *'tcpmsswilink'*:
[....]
%cat /usr/local/etc/mpd5/mpd.conf | grep fix
set iface enable tcpmssfix
[....]
I hope that shed some light.
Regards,
Raúl.
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