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RE: My ADSL saga - Updates
- To: "'Dani Arbel'" <darbel(at-nospam)techunix.technion.ac.il>
- Subject: RE: My ADSL saga - Updates
- From: "Haim Gelfenbeyn" <haim(at-nospam)hageltech.com>
- Date: Thu, 5 Jul 2001 23:54:29 +0300
- Cc: "'ILUG'" <linux-il(at-nospam)linux.org.il>
- Delivered-To: linux.org.il-linux-il@linux.org.il
- Importance: Normal
- In-Reply-To: <Pine.GSO.4.33.0107052350510.3153-100000@techunix.technion.ac.il>
- Organization: Hagel Technologies
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
> 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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