Re: Iperf results vary when roles of client and server are interchanged

[Paul Hyder <Paul.Hyder --at-- noaa.gov>]

I've never had much luck tuning Windows, had results like yours and decided
to just use Linux.  You don't provide details of how much you tuned the
Win 2000 but if you haven't already done so take a look at
    http://rdweb.cns.vt.edu/public/notes/win2k-tcpip.htm

As noted (at http://www.psc.edu/networking/projects/tcptune/#Win2k) it is about the
best summary/checklist of the registry edits that might be applicable.
    Paul Hyder
    NOAA Forecast Systems Laboratory

ayan ghosh wrote:
> Hi mate,
>  I tried running Iperf in 2 laptops(Win 2000) but got only 10 mbps thorughput using a Ethernet Cable. I have checked the network settings of the laptops and it is configured for 100 mbps. Do you know any reason why this could happen?
> Ayan
>
> chidambaram <cperiyak --at-- yahoo.com> wrote:
> Hello,
>
> I have a windowsXP machine and a linux machine 
> connected back-to-back on gig interface.
> The interfaces are auto-negotiate and are running as
> 1000Mbps Full duplex.
>
> When I run iperf with windows as client and unix as
> server I get 660 Mbps throughput.
>
> But if I reverse the role of client and server I get
> very less throughput.Ie if I make windows as Server 
> and linux as Client I get 185 Mbps.I tried varying the
> TCP Windows size and it doesnt seem to have any
> impact.
>
> Could someone help me to figure out why I see this
> kind
> of varying behavior.
>
> Thanks
>
>
> 		
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