Please confirm: top(1) cpu time broken on FreeBSD 6.1 (RELEASE/STABLE) SMP ?

[Martin Blapp]

Hi all,

I'm currently seeing strang things going on on all our
upgraded SMP 2 CPU boxes. 4 Boxes are upgraded from 5.5 to
6 STABLE, one box is running 6.1 RELEASE.

All of them have SMP kernels, just using the provided GENERIC and SMP
kernel config files. Mergemaster has been done on all
boxes.

If a box is full loaded top(1) shows:

CPU states: 41.7% user,  0.0% nice,  7.7% system,  0.6% interrupt, 50.0% idle

I can buildworld -j 100, do verything what I want. The
sum of idle time never goes below 50.0% idle ! And the sum
of total CPU time never goes over 50.0%.

So I wonder if just top is broken (in 6.1 RELEASE too), or if this
is a SCHED4BSD bug.

Can someone confirm this issue ? We see it on IBL X-Series 346 Boxes,
as on IBM 306M Dual Core SMP systems.

Martin

Martin Blapp, <mb at imp.ch> <mbr at FreeBSD.org>
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