Device polling performance

Jerry McAllister jerrymc at
Mon Sep 27 12:03:40 PDT 2004

> In a message dated 9/25/04 4:12:52 PM Eastern Daylight Time, mike at 
> writes:
> >FreeBSD team for developing a stack that uses no resources.
> .... For the record, what I was saying was that a decent machine (e.g. 2.4 
> PIV) should be able to push 200,000 packets per second with decent NICs 
> (em, or fxp) and with a median packet size (see of about 540 
> bytes, that works out to ~ 100Mb/s.
> No you didn't, you said that 200Kpps would show almost no cpu usage, which
> is utterly ridiculous.
> Mike at previously wrote:
> "Given a decent CPU, you wont see very much of a load average at all in the 
> 200Kpps / 100Mb range."

Note that load average and CPU usage are two intirely different things.
You could have a huge amount of CPU usage with a load average hovering
around zero and somewhat vice versa too - eg high load average without
a great deal of CPU usage - though that would be less common.


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