Date: Mon, 07 Sep 2009 09:05:30 -0400 From: Mike Tancsa <mike@sentex.net> To: Willem Jan Withagen <wjw@digiware.nl> Cc: net@freebsd.org Subject: Re: UDP output performance Message-ID: <200909071301.n87D1kqY062913@lava.sentex.ca> In-Reply-To: <4AA4F11C.4060200@digiware.nl> References: <4AA14018.3010102@digiware.nl> <5bc218350909041002x670460c8nf202a714182d1bf6@mail.gmail.com> <4AA4F11C.4060200@digiware.nl>
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At 07:40 AM 9/7/2009, Willem Jan Withagen wrote:
>Well this turns out to be a pilot error, in that I created such a
>complex bandwidth evaluation that on buffer full the packet got
>tossed in the application.
>:(
>
>Just stripping that out, and just do a
>
>try send
>while(not send) {
> usleep(1 packet-time);
> try again;
>}
There are some nice simples tool in /usr/src/tools/tools/netrate that
are great for generating arbitrary bandwidth via udp packets you
might want to have a look at.
---Mike
>
>Reduced my packet loss to < 0.1% and I'm able to squeeze a nice >
>900 Mbit/s out of a single em(4) port. Still no packets begin
>dropped in netstat -i.
>
>So now I'm off hunting for 'bugs' in snmp, cacti, mrtg to see why
>they don't like the counters. Even when I'm using the 64bit counters
>I get really spiky bandwidth results. Equal to those when using 32
>bits counters, so certainly things are not as I think they are.
>
>Other thing is to see how Lin* is performing on this test.
>So trying to install ubuntu 9.04.
>
>--WjW
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Sentex Communications, mike@sentex.net
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