Expected file transfer speeds over Gigabit?

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Date: Fri, 22 Oct 2004 14:25:38 -0400

Hi,

If anyone has done any timed testing or benchmarking for file transfers
between two machines running Windows 2000 Server with GigE adapters, I
was wondering if you could post your results?

I'm doing some testing between two servers with Xeon processors and
Intel NICs, with two large compressed files, and am getting results from
about 11 Mbytes/sec to 26 Mbytes/sec, depending upon what software I use
for testing the transfers. The test files are about 700 Mbytes and
about 4 Gbytes. The systems are booted from RAID'ed SAN volumes, and
I've measured the 'drive' performance using HDTach and Sandra, and got
about 90 Mbytes/sec average speed, so 'disk' speed should be a small
factor.

I've been testing with FTP and with Robocopy (from the Windows Resource
Kit). I've done some tweaking of Registry, with little or no
improvement, but the results above were on clean, untweaked installs.

I've also done pure network testing using netperf, etc., and got about
300 Mbits/sec using default parameters, and 900+ Mbits/sec using
non-default parameters, but now I'm trying to see how 'real' transfer
performance would be.

For FTP, on the server side, I'm using the MS FTP server, and for the
client side, I've used both the MS command line FTP client and the NCFTP
client.

The 26 Mbytes/sec results were using Robocopy, and in all cases, CPU
Utilization is less than 10% using both Perfmon and Task Manager, so CPU
load doesn't appear to be an issue.

If anyone has done any similar testing, I'd be very interested in
hearing about your results, as I'm trying to 'sanity check' what I'm
finding, i.e., that, at best, it's only possible to get about 1/4 - 1/3
of the true network bandwidth.

Thanks,
Jim

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