Re: Actual window sized used
Nevermind, I answered my own question. I was misreading the packet trace
apparently. iperf was correct.
----- Original Message -----
From: "Chris McFarling" <cmcfarling_lists --at-- pacificpremedia.com>
To: <iperf-users --at-- dast.nlanr.net>
Sent: Monday, September 19, 2005 6:47 PM
Subject: Re: Actual window sized used
> I did some monitoring with Windows Network Monitor today to try to confirm
> iperfs behavior. First I removed the registry edits that I had made
> previously, essentially setting Windows back to it's default behavior. The
> key removed were:
>
> GlobalMaxTcpWindowSize=17520
> Tcp1323Opts=1
> TcpWindowSize=17520
>
> I then ran iperf with the following params:
>
> server
> iperf -s -p 5001 -w 17520
>
> client
> iperf -w 17520 -n 100M -p 5001 -c server06
>
> On both the client & server, iperf reported that it was using the
requested
> TCP window size. However, the packets captured in Network Monitor showed
> that a window size of 64240 was being used. Which one is correct?
>
> Thanks
>
>
> ----- Original Message -----
> From: "William E. Allcock" <allcock --at-- mcs.anl.gov>
> To: <iperf-users --at-- dast.nlanr.net>
> Sent: Friday, September 09, 2005 4:43 PM
> Subject: Re: Actual window sized used
>
>
> > That is true for the default, but iperf can not override the maximum
> > value set.
> >
> > Bill
> >
> > McConnell Andrew (CDI) wrote:
> > > Whatever window size you set on iperf's command line will override the
> > > OS setting. If you don't specify a window using -w then iperf will use
> > > the window size your OS specifies.
> > >
> > > --Andy
> > >
> > >
> > > -----Original Message-----
> > > From: owner-iperf-users --at-- dast.nlanr.net
> > > [mailto:owner-iperf-users --at-- dast.nlanr.net] On Behalf Of Chris McFarling
> > > Sent: Friday, September 09, 2005 11:28 AM
> > > To: iperf-users --at-- dast.nlanr.net
> > > Subject: Actual window sized used
> > >
> > > Do TCP window parameter settings in the OS affect the window size used
> > > by
> > > iperf? For example, if I make the following registry edits in Win2K:
> > >
> > > GlobalMaxTcpWindowSize=17520
> > > Tcp1323Opts=1
> > > TcpWindowSize=17520
> > >
> > > and the start iperf with the following:
> > >
> > > iperf -s -w 65700
> > >
> > >
> > > will iperf use a 65700 byte window or will it use a 17520 window? It
> > > reports
> > > that is using a window size of 64K but I just want to verify that what
> > > it's
> > > reporting is actually true.
> > >
> > > Thanks
> > >
> > >
> > >
> > >
> >
> > --
> > William E. Allcock
> > Argonne National Laboratory
> > Bldg 221, Office C-115A
> > 9700 South Cass Ave
> > Argonne, IL 60439-4844
> > Office Phone: +1-630-252-7573
> > Office Fax: +1-630-252-1997
> > Cell Phone: +1-630-854-2842
> >
> >
>
>