Re: Measuring tools - top and interrupts

[Danial Thom]

> Network traffic is usually IO bound, not CPU
> bound. The load figures
> top shows tell something about the amount of
> work the CPU has to do,
> not about how busy your PCI bus (or whatever
> bus the NIC lives on) is.
> 
> IIRC the networking layer in 2.6 differs quite
> a lot from 2.4, so the
> load average figures can be quite misleading.
> 

For the record, *most* of the work are I/O calls
(ie reading and writing registers), which are not
in the "background". I/O calls become more and
more expensive as the bus becomes saturated as it
takes longer to get the bus to do the operation. 

DT

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