something like:
echo 64 > /proc/sys/net/ipv4/tcp_app_win
to fix the window to 64k
run tcpdump to see what it actualy advertizes as the window size.
Dani
On Thu, 5 Jul 2001, Haim Gelfenbeyn wrote:
> > so ry to double the window size ....
>
> Umm... Maybe I'm not expressing myself clear. But my question was how do
> I do exactly that. If I knew, I wouldn't ask.
> Haim.
>
>
> >
> > On Thu, 5 Jul 2001, Haim Gelfenbeyn wrote:
> >
> > > >
> > > > Haim,
> > > > The default window on linux is 64k. should be enough and over
> > > > the b/w you
> > > > have from your ISP (if RTT is ~300 ms then 64K window is
> > > > about 200Kb/s .
> > > > Does tour ISP give you this much?).
> > > > Dani
> > >
> > > Yes indeed. When I start one download from some U.S-based
> > site, I get
> > > around 150-200 kbps, however when I start several downloads from the
> > > SAME site, I can get up to 1.5-1.8 Mbps. Barak's
> > advertising is "2 mbps
> > > downstream", I never got that much, but I do get close sometimes.
> > >
> > > Now 300 ms is very good, I often get twice as slow, so
> > let's see, 64 K @
> > > 600 ms, we will get around 100 Kb/sec = 800 kbps : half of
> > what I can
> > > easily get. I defenitely see place for improvement.
> > >
> > > Haim.
> > >
> > > >
> > > > On Thu, 5 Jul 2001, Haim Gelfenbeyn wrote:
> > > >
> > > > > Hello,
> > > > > As far as I understand, changing MTU on a router should
> > not prevent
> > > > > clients with higher MTU working. I mean that if some
> > router receives
> > > > > packet it cannot pass as-is, it should return some kind of
> > > > ICMP error,
> > > > > and the client should re-send the packet with smaller MTU.
> > > > So if it's
> > > > > true and the problem is with MTU on Netvision router, then
> > > > either the
> > > > > router is misconfigured, or incoming icmp is incorrectly
> > > > blocked with
> > > > > firewall rules on client.
> > > > >
> > > > > Other (but close) topic:
> > > > > ADSL connection can be described as high-bandwidth
> > > > high-latency (to U.S.
> > > > > networks at least), therefore transfer times can be
> > improved greatly
> > > > > with larger TCP receive window. I saw that changing RWIN on
> > > > Windows can
> > > > > gain 30% in download speeds with ADSL. Anybody knows if
> > > > receive window
> > > > > is worth tweaking on Linux, and if yes, how to do it
> > > > correctly. I took a
> > > > > look at kernel documentation, and then in the /proc, but
> > > > there are too
> > > > > many parameters there, and I cannot see any apparent
> > > > results by changing
> > > > > them. I'm using 2.4.5 kernel.
> > > > >
> > > > > Haim Gelfenbeyn.
> > > > >
> > > > >
>
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