[j-nsp] Speed

[Alex Arseniev]

Use TCP Optimizer to increase WSCALE/RWIN on Windows hosts to achieve better 
TCP perf
http://www.speedguide.net/downloads.php
Thanks
Alex

----- Original Message ----- 
From: "Saku Ytti" <saku at ytti.fi>
To: <juniper-nsp at puck.nether.net>
Sent: Monday, April 08, 2013 8:13 AM
Subject: Re: [j-nsp] Speed


> On (2013-04-08 03:46 +0200), Johan Borch wrote:
>
>> of a single session with a RTT of only 8ms? The performance is the same 
>> if
>> I use 2 switches and the clients directly connected as if i use routers
>> between. Any idea what it could be?
>
> bw * delay = window
>
> so
>
> window / delay = bw
>
> 64k*8 / 0.008 = 64000kbps = 64Mbps
>
> To achieve 40Mbps, you'd need
>
> 40M*1000/8 * 0.008 = 48kB window
>
> make sure with tshark what your actual window size is, don't trust iperf.
> Best thing is to configure OS TCP stack to window scaling and dont touch
> iperf window settings, I don't know why, but they just seem to break 
> stuff.
>
> Also never measure network with TCP, measure network with UDP, measure TCP
> stack of hosts with TCP.
>
> -- 
>  ++ytti
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
>