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[Qemu-devel] [Bug 979714] Re: The pit interrupt still exists even with t
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [Bug 979714] Re: The pit interrupt still exists even with tickless guest |
Date: |
Sat, 14 Apr 2012 06:57:32 -0000 |
Yes, there is some regression in the old kvm-pit code of qemu-kvm. Will
be fixed soon by switching to upstream's kvm-pit.
--
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https://bugs.launchpad.net/bugs/979714
Title:
The pit interrupt still exists even with tickless guest
Status in QEMU:
New
Bug description:
Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows): Linux(RHEL6u1)
kvm.git Commit:4f324a1b
qemu-kvm Commit: b5ed4b6f
Host Kernel Version:3.3.0-rc5
Hardware: Romley-EP, WSM-EP
Bug detailed description:
--------------------------
Start a guest and check into /proc/interrupts, the timer interrupt will
constantly increase while local timer interrups are already increasing.
qemu-kvm commit: 9d636ae7 doesn't have this issue.
The dmesg of the guest shows:
APIC calibration not consistent with PM-Timer: 191ms instead of 100ms
This should be a qemu-kvm bug.
kvm + qemu-kvm = result
4f324a1b + b5ed4b6f = bad
4f324a1b + 9d636ae7 = good
Reproduce steps:
----------------
1. start up a host with kvm kernel
2. qemu-system-x86_64 –m 1024 –smp 2 –net none –hda /root/rhel6u1.img
3. cat /proc/interrupts
Current result:
----------------
interrupt 0 keeps increasing
Expected result:
----------------
interrupt 0 stops at some value and doesn't increase
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