Re: TCP performance on GBE LAN

From: Dmitry Yusupov
Date: Thu Mar 03 2005 - 12:27:45 EST


On Thu, 2005-03-03 at 02:20 -0800, sai narasimhamurthy wrote:
> Hi,
> I just do not understand why the throughputs indicated
> by IPERF on a GBE LAN is so very low!!! I am speaking
> of throughputs around 50-100 Mb/s!! I understand all
> the optimizations of jumbo frames(I have max'd it!)
> and large windows etc(which shouldnt actually matter
> in a LAN since the RTTs are so very low) . The two
> machines I am working on are not even 10 meters
> away!!!:))
>
> My iSCSI application is heavily hampered by TCP. I am
> working with the 2.6.10 kernel..(has any one faced low
> throughputs in a GBE with 2.6.10? let me know ) .

depends on which iSCSI application you are using.
There is new, very fast implementation of iSCSI Initiator for Linux
kernel: www.open-iscsi.org. Take a look.

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