[Bug 232204] 11.2-RELEASE on Raspberry Pi2 ignoring one CPU.
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Fri Oct 12 14:33:39 UTC 2018
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232204
Bug ID: 232204
Summary: 11.2-RELEASE on Raspberry Pi2 ignoring one CPU.
Product: Base System
Version: 11.2-RELEASE
Hardware: arm
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: arm
Assignee: freebsd-arm at FreeBSD.org
Reporter: steve at oldmillretro.co.uk
I have 2 Raspberry Pi2s running FreeBSD 11.2-RELEASE, one is using the latest
image
(https://download.freebsd.org/ftp/releases/ISO-IMAGES/11.2/FreeBSD-11.2-RELEASE-arm-armv6-RPI2.img.xz),
the other I have built from source (r338421). Both seemed to function perfectly
with no stability issues but I noticed some odd load values. Despite being
98%-100% idle, the systems show load values in the region of but never less
than 1.00. After some brief investigation only CPU 0,1 and 3 are being utilised
despite all 4 cores being discovered on boot. CPU 2 remains 100% idle at all
times on both machines.
root at pi2:~ # sysctl hw.ncpu
hw.ncpu: 4
Running top -P at idle shows :-
last pid: 9083; load averages: 1.09, 1.09, 1.03 up 3+01:04:56 06:25:53
21 processes: 1 running, 20 sleeping
CPU 0: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
CPU 1: 5.3% user, 0.0% nice, 0.0% system, 0.0% interrupt, 94.7% idle
CPU 2: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
CPU 3: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
Mem: 4464K Active, 31M Inact, 72M Wired, 29M Buf, 688M Free
Swap:
Running top -P with make -j8 buildworld :-
last pid: 10475; load averages: 8.62, 3.53, 2.06 up 3+01:16:06 14:29:56
67 processes: 12 running, 55 sleeping
CPU 0: 73.7% user, 0.0% nice, 12.5% system, 13.7% interrupt, 0.0% idle
CPU 1: 89.0% user, 0.0% nice, 11.0% system, 0.0% interrupt, 0.0% idle
CPU 2: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
CPU 3: 82.0% user, 0.0% nice, 6.7% system, 11.4% interrupt, 0.0% idle
Mem: 113M Active, 92M Inact, 93M Wired, 38M Buf, 498M Free
Swap:
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