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Re: NDT offering up unusually slow results...


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  • From: Mike Iglesias <>
  • To: Richard Carlson <>
  • Cc: Phil Reese <>,
  • Subject: Re: NDT offering up unusually slow results...
  • Date: Tue, 13 Sep 2005 08:17:15 -0700

> Hi Phil;
>
> What version of Linux are you using? Have you tuned the stack
> (/proc/sys/net/ipv4/tcp_*mem)? Also, look at the "More Details"
> window and let me know what CurCwnd, CurRwinRcvd, Duration, and Sndbuf
> values are.
>
> Off the top of my head, either the Linux stack is untuned and the
> server is limiting the throughput, or the NDT has a bug and the test
> is running longer than it should, (and skewing the results).

I've seen this when the ndt process starts getting seg faults, probably
after transfering some data. Unfortunately it's not reproducable
enough to get more information on where it is getting the seg faults.


Mike Iglesias Email:

University of California, Irvine phone: 949-824-6926
Network & Academic Computing Services FAX: 949-824-2069




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