Public bug reported:
I may have found a bug as when trying to boot up an QEMU VM with the
following command: "qemu-system-mips -M malta -m 512 -hda hda.img
-kernel vmlinux-4.19.0-10-4kc-malta -initrd initrd.img-4.19.0-10-4kc-
malta -append "root=/dev/sda1 console=ttyS0" -nographic -device
e1000,netdev=user.0 -netdev user,id=user.0,hostfwd=tcp::5555-:22 -smp
cores=12,threads=1,sockets=1", it will use up all of the CPU cores on
the host, but not bootup?
Kernel log also shows:
[ 100.303136] perf: interrupt took too long (2506 > 2500), lowering
kernel.perf_event_max_sample_rate to 79750
[ 107.656869] perf: interrupt took too long (3195 > 3132), lowering
kernel.perf_event_max_sample_rate to 62500
[ 117.668390] perf: interrupt took too long (4033 > 3993), lowering
kernel.perf_event_max_sample_rate to 49500
[ 217.166763] perf: interrupt took too long (5126 > 5041), lowering
kernel.perf_event_max_sample_rate to 39000
[ 231.910132] perf: interrupt took too long (6445 > 6407), lowering
kernel.perf_event_max_sample_rate to 31000
[ 250.170677] perf: interrupt took too long (8087 > 8056), lowering
kernel.perf_event_max_sample_rate to 24500
[ 285.391451] perf: interrupt took too long (10126 > 10108), lowering
kernel.perf_event_max_sample_rate to 19750
[ 778.588911] perf: interrupt took too long (12770 > 12657), lowering
kernel.perf_event_max_sample_rate to 15500
[ 1554.825129] perf: interrupt took too long (15982 > 15962), lowering
kernel.perf_event_max_sample_rate to 12500
[ 1622.838910] hrtimer: interrupt took 14758063 ns
[ 1712.932777] INFO: NMI handler (perf_event_nmi_handler) took too long to run:
0.000 msecs
[ 1712.932780] perf: interrupt took too long (59793 > 19977), lowering
kernel.perf_event_max_sample_rate to 3250
System details:
OS: Ubuntu 20.04
QEMU emulator version 4.2.0 (Debian 1:4.2-3ubuntu6.3)
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Project changed: launchpad => qemu
** Project changed: qemu => qemu (Ubuntu)
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https://bugs.launchpad.net/bugs/1890069
Title:
QEMU is not allowing multiple cores with mips architecture
Status in qemu package in Ubuntu:
New
Bug description:
I may have found a bug as when trying to boot up an QEMU VM with the
following command: "qemu-system-mips -M malta -m 512 -hda hda.img
-kernel vmlinux-4.19.0-10-4kc-malta -initrd initrd.img-4.19.0-10-4kc-
malta -append "root=/dev/sda1 console=ttyS0" -nographic -device
e1000,netdev=user.0 -netdev user,id=user.0,hostfwd=tcp::5555-:22 -smp
cores=12,threads=1,sockets=1", it will use up all of the CPU cores on
the host, but not bootup?
Kernel log also shows:
[ 100.303136] perf: interrupt took too long (2506 > 2500), lowering
kernel.perf_event_max_sample_rate to 79750
[ 107.656869] perf: interrupt took too long (3195 > 3132), lowering
kernel.perf_event_max_sample_rate to 62500
[ 117.668390] perf: interrupt took too long (4033 > 3993), lowering
kernel.perf_event_max_sample_rate to 49500
[ 217.166763] perf: interrupt took too long (5126 > 5041), lowering
kernel.perf_event_max_sample_rate to 39000
[ 231.910132] perf: interrupt took too long (6445 > 6407), lowering
kernel.perf_event_max_sample_rate to 31000
[ 250.170677] perf: interrupt took too long (8087 > 8056), lowering
kernel.perf_event_max_sample_rate to 24500
[ 285.391451] perf: interrupt took too long (10126 > 10108), lowering
kernel.perf_event_max_sample_rate to 19750
[ 778.588911] perf: interrupt took too long (12770 > 12657), lowering
kernel.perf_event_max_sample_rate to 15500
[ 1554.825129] perf: interrupt took too long (15982 > 15962), lowering
kernel.perf_event_max_sample_rate to 12500
[ 1622.838910] hrtimer: interrupt took 14758063 ns
[ 1712.932777] INFO: NMI handler (perf_event_nmi_handler) took too long to
run: 0.000 msecs
[ 1712.932780] perf: interrupt took too long (59793 > 19977), lowering
kernel.perf_event_max_sample_rate to 3250
System details:
OS: Ubuntu 20.04
QEMU emulator version 4.2.0 (Debian 1:4.2-3ubuntu6.3)
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