rtc: lost some interrupts at 1024Hz.
Whenever I start a guest, I get kernel log filled with "rtc: lost some interrupts at 1024Hz".
What's the reason for it?
I searched the archives, and it looks that this problem did already happen for a couple of people.
Also in my case, it looks that KVM is not the problem here, but Qemu.
Searching Qemu forums revealed one such report with no reply[1].
Searching Qemu-devel list revealed one report, with no solution[2]
Because of that, the performance is really bad.
Is there a solution for that? I use kvm-intel, if needed, I can attach kernel .config.
[1] http://qemu-forum.ipi.fi/viewtopic.php?t=1468
[2] http://lists.gnu.org/archive/html/qemu-devel/2006-07/threads.html#00193
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Quoted 3 lines · Tomasz Chmielewski
Whenever I start a guest, I get kernel log filled with "rtc: lost some interrupts at 1024Hz".
Does rebooting the host machine with nolapic on the kernel command line help?
What sort of system are you using?
Regards,
Anthony Liguori
Quoted 13 lines
What's the reason for it?
I searched the archives, and it looks that this problem did already happen for a couple of people.
Also in my case, it looks that KVM is not the problem here, but Qemu.
Searching Qemu forums revealed one such report with no reply[1].
Searching Qemu-devel list revealed one report, with no solution[2]
Quoted 11 lines
Because of that, the performance is really bad.
Is there a solution for that? I use kvm-intel, if needed, I can attach kernel .config.
[1] http://qemu-forum.ipi.fi/viewtopic.php?t=1468
[2] http://lists.gnu.org/archive/html/qemu-devel/2006-07/threads.html#00193
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Quoted 7 lines · Anthony Liguori
Quoted 3 lines · Tomasz Chmielewski
Whenever I start a guest, I get kernel log filled with "rtc: lost some interrupts at 1024Hz".
Does rebooting the host machine with nolapic on the kernel command line help?
It turned out, this option needs to be enabled:
Processor type and features --->
[*] Provide RTC interrupt
(or CONFIG_HPET_EMULATE_RTC=y in .config).
With it enabled, I don't have these messages anymore, and performance is much much better.
Quoted 1 line
What sort of system are you using?
# uname -a Linux syn5 2.6.21-rc6 #3 SMP Fri Apr 13 16:37:31 CEST 2007 x86_64 Intel(R) Xeon(R) CPU 3050 @ 2.13GHz GNU/Linux
KVM-18.
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