Date: Thu, 22 Nov 2012 12:22:58 +0100 From: Ingo Flaschberger <if@xip.at> To: Marc Peters <marc@mpeters.org> Cc: freebsd-net@freebsd.org Subject: Re: Low Bandwidth on intercontinental connections Message-ID: <50AE0B12.8000309@xip.at> In-Reply-To: <50ADE5E4.9090708@mpeters.org> References: <50ACF62C.8000408@mpeters.org> <CAOgwaMuUuJ2%2BmKqsFVp=DyVFkfm8Et%2Brnt2iEGDO8i1Kt_kDVA@mail.gmail.com> <50ad087d.1892cc0a.2cce.3bf2@mx.google.com> <50AD1012.7020209@mpeters.org> <50AD14F8.8050001@xip.at> <50ADE5E4.9090708@mpeters.org>
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>> *) check and compare tcpdump
> for the FreeBSD hosts on the receiver side, it showed a lot of window
> size changes and from time to time a lot of duplicate ACKs. i will file
> a PR (as Adrian asked) and see to get a matching tcpdump and SIFTR output.
*) can you check which ping-sizes work?
ping -s 1472
ping -D -s 1472 (should work if you have a mtu of 1500 all over the
way)
*) any offloading/supported used at the network-card?
*) try a rate-shaping queue outgoing (not really good - as shaping works
best on incomming interfaces):
you need dummynet (and ipfw for this example):
ipfw add pipe 1 all from ....
ipfw pipe 1 config bw 10Mbit/s queue 50Kbytes
(adjust queue size ~40ms at rated speed)
Kind regards,
Ingo Flaschberger
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