[Click] SMP Click - a doubt

[Eddie Kohler]

Hi Giorgio,

On Apr 2, 2004, at 3:15 AM, Giorgio Calarco wrote:

> Hi all,
>
> I'm making some performance tests using a 2-CPU
> (Xeon 3GHz) system + Click (as a standard router).
> I disabled Hyperthreading and compiled the patched
> kernel (2.4.18) with the SMP option enabled.
>
> After that, i have configured and compiled click 1.3pre1
> with the following options:
>
>  --enable-adaptive --enable-intel-cpu --enable-multithread=2 
> --disable-userl
> evel
>
> I have a big big doubt: can the "enable-adaptive" option be used 
> together
> with
> the "enable-multithread" one ? Is it effective ? If so,
> are the min-cpu-share nad max-cpu-share values applied to both 
> processors ?

We have not tested this configuration, but it should work.  (The current
code does set the CPU share values to all threads.)

> I ask this since if i monitor the CPUs activity using top, the
> min-cpu value seems not to be strictly applied.
> When I do not inject any packet into the router, CPU#0
> is almost idle, while CPU#1 works respecting the min-cpu threshold.
> On the opposite, when I inject traffic, CPU#0 is kept busy, while
> CPU#1 is idle most of the time (at least that what seems to happen,
> consider that top has got 1 sec granularity).
>
> Thus, is that what I should expect to happen ?

Two things:

1. Can you run this test on click-1.4pre1 and tell us what happens?
2. Do the min- and max-cpu thresholds work without --enable-multithread?

Eddie