DragonFly users List (threaded) for 2006-06
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Re: usage accounting inconsistencies
--- Danial Thom <danial_thom@xxxxxxxxx> wrote:
> When applying a constant load (v1.5.3-PREVIEW),
> usage is categorized differently in UP mode
> than
> n SMP model.
>
> In UP Mode
>
> CPU-0 state: 0.00% user, 0.00% nice, 0.00%
> sys, 32.14% intr, 67.86% idle
>
> In SMP mode:
>
> CPU-0 state: 0.00% user, 0.00% nice,
> 31.27%
> sys, 0.00% intr, 68.73% idle
> CPU-1 state: 0.00% user, 0.00% nice,
> 0.00%
> sys, 1.56% intr, 98.44% idle
>
> Is this to be expected? It seems to me that if
> the handoff to the receive queue marks the end
> of
> interrupt processing in SMP mode (I assume),
> that
> it also should be measured that way in UP mode.
> It would be nice if they were the same so one
> could get a better handle on the efficiencies
> or
> inefficiencies of the SMP processing.
>
> DT
:
: Nearly all interrupts are run on cpu 0. This
: isn't going to change
: until the APIC interrupt routing infrastructure
: is rewritten.
:
: Matt
If thats the case, then why is cpustat showing
'intr' usage only on CPU-1?
DT
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