Ethereal-users: RE: RE: RE: [Ethereal-users] Can you help me diagnose a performanceproblem?
But my window size is large, so why do segments get ACKd frequently (every
segment in one case, and every 2 segments in the other)?
Steve
> -----Original Message-----
> From: ethereal-users-bounces@xxxxxxxxxxxx [mailto:ethereal-users-
> bounces@xxxxxxxxxxxx] On Behalf Of Stef
> Sent: Friday, 30 July 2004 11:00 PM
> To: Ethereal user support
> Subject: Re: RE: RE: [Ethereal-users] Can you help me diagnose a
> performanceproblem?
>
> On Fri, 30 Jul 2004 14:07:14 +0200, bleonhardt@xxxxxxxxxxx
> <bleonhardt@xxxxxxxxxxx> wrote:
> > Hi,
> >
> > AFAIK,
> >
> > tcp uses windowing, so not every packet should be acknowledged - of
> > course, a ACK of every packet / frame will slow down the connection as
> > there's more traffic on the network than usual ..
> >
> > ... maybe a resize of the window-size could help .. try DrTCP ( just
> google
> > for it ) to change the settings .. then restart your network ( 2k/xp )
> or
> > restart the pc/notebook.
> >
> > -Alex
> >
> > Bruno-Alexander Leonhardt
>
> Right! The TCP receive window size is indicating the other end how
> much data (in bytes) can be buffered during the connection. The
> sending host can only send that much, before waiting for an ACK, so
> this can have a great impact on performance. What strikes me as odd is
> the valule for this, in your example. As far as I know, this should be
> a multiple of MSS (maximum segment size), so that you do not fragment
> fragments, basically.
>
> In any case - a tweak of the above is worth trying (and keeping in
> mind the multiple factor I am talking about - which MSS is derived
> from the MTU of your underlying infrastructure, and should be seen in
> some of the packets (perhaps using windump, if not shown in
> ethereal?!?). Though not specifically XP related, start here, or
> google for the same terms used in this article:
>
> http://www.jsiinc.com/SUBI/tip4000/rh4015.htm
>
> HTH,
> Stef
>
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