Re: Expected file transfer speeds over Gigabit?

From: Buddy Ackerman (buddy_nospam_at_buddyackerman.com)
Date: 10/28/04 

Date: Thu, 28 Oct 2004 10:12:41 -0500

I have a similar question. I have three servers using Tyan Dual Athlon MP
processor motherboards (with two processors each) that have gigabit Ethernet
ports on the motherboard. They are Intel(R) PRO/1000 MT Server Adapter
interfaces (and I keep up with the driver updates through Windows Update so
I assume that I have the latest drivers). I am using a 5 port Linksys
switch (don't know the exact model but it was pretty cheap, about $100).
I'm only getting about 10MB/sec transfer speed on file transfers between the
machines (based on a file manager copy operation). I used the Network
Monitor to get the transfer rate information. I was expecting something
along the lines of 50MB/sec transfer speed. Why is it so slow? Is it the
cheap switch or are there some network setting that I can change to improve
the performance?

--Buddy

"Roland Hall" <nobody@nowhere> wrote in message
news:eAlmSvSuEHA.3320@TK2MSFTNGP15.phx.gbl...
> "ohaya" wrote in message news:417950A2.33EC2E4F@cox.net...
> : 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.
>
> Now tell us about the infrastructure of your interconnectivity equipment
> since that might be where your bottleneck is and it is a controlled
> environment or are you in the middle of production?
>
> I'll have additional follow-up questions after your reply.
>
> --
> Roland Hall
> /* This information is distributed in the hope that it will be useful, but
> without any warranty; without even the implied warranty of merchantability
> or fitness for a particular purpose. */
> Online Support for IT Professionals -
> http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech
> How-to: Windows 2000 DNS:
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201
> FAQ W2K/2K3 DNS:
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;291382
>
>

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