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Message-ID: <19971217175721.26785@lemis.com>
Date: Wed, 17 Dec 1997 17:57:21 +1030
From: Greg Lehey <grog@lemis.com>
To: sthaug@nethelp.no
Cc: hackers@FreeBSD.ORG
Subject: Re: 3com 3c509 card
References: <19971217113801.53802@lemis.com> <19822.882343067@verdi.nethelp.no>
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In-Reply-To: <19822.882343067@verdi.nethelp.no>; from sthaug@nethelp.no on Wed, Dec 17, 1997 at 08:17:47AM +0100
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On Wed, Dec 17, 1997 at 08:17:47AM +0100, sthaug@nethelp.no wrote:
>> I've been doing some experiments with ftps on my local network, but
>> the results have been puzzling, and until I know what's going on, I'm
>> not going to go into too much detail.  But I've noticed that I'm
>> getting very high interrupt times on a P5/133 (up to over 50%) when
>> receiving large files (40 MB).  I've also noticed that the transfer
>> starts at about 1 MB/s, but after about 10 MB there are problems, and
>> the final transfer rate is often less than 500 kB/s.  This is not what
>> I measured on the same systems about a year ago.  I may follow up on
>> this if I find time.
>
> If you're trying to measure measure network performance, why don't you
> use a tool which is suitable for the job? FTP is definitely not a good
> tool for this job.

Good idea.  This wasn't so much "testing" as confirmation of what I
had seen before.  The results surprised me, so I took a closer look.

> I'd suggest ttcp or NetPerf.

Thanks.  Where do I get them?

> Btw, I've measured more than a megabyte/s myself with NE2000 clones
> (Kingston) on a 486, using ttcp.

Yes, there's more to this than meets the eye.  But I don't know if I
have time to look at it.

Greg