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Re: How to set the size of the send buffer?

From: Guido Reina <>
Date: Wed, 30 Oct 2002 09:13:29 +0100

Is the Windows's MTU shared by all connections? (or can I have specific
values for each connection?)

Thanks again.

----- Original Message -----
From: "Rick Jones" <>
To: <>
Sent: Wednesday, October 23, 2002 6:44 PM
Subject: Re: How to set the size of the send buffer?

> Guido Reina wrote:
> >
> > Thanks for your explanations. The problem we have is slighty
> > different. We have different lines with differents Qualitys. The
> > problem is , if the line has a lot of noise (Poor Quality) for us is
> > better to copy by small fragments instead big chunks. In fact the
> > final idea is to calculate in real time the number of failed attemps
> > and then if one of the destinations achieved a lot of them, then try
> > to adjust the buffers to low size to avoid the noise in the line. This
> > well be done dinamically.
> >
> > Thanks a lot for your pattient, but as you see this problem is very
> > specific and we are working with this kind of problems during several
> > years and i see if i do it manually (To reduce the buffer) it's works
> > really fine.
> Do you know which lines are of poor quality and which are not? If so,
> then on the sender, add specific host/network routes for the
> networks/hosts reached through those lines, specifying a smaller Path
> MTU. TCP will then use a smaller segment size, but you can keep the
> large TCP window.
> You get the smaller TCP segments which will be less likely on average to
> have a bit error in them, but can keep the window sized such that you
> have a decent shot at getting a fast retransmit
> Another way to go is at the router for each of those noisy lines, reduce
> the MTU and let "normal" Path MTU discovery give you the small TCP
> segment size.
> rick jones
> --
> Wisdom Teeth are impacted, people are affected by the effects of events.
> these opinions are mine, all mine; HP might not want them anyway... :)
> feel free to post, OR email to raj in but NOT BOTH...
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Received on 2002-10-30