On 03/21/2010 04:55 PM, Sebastian Hetze wrote:
On Sun, Mar 21, 2010 at 02:19:40PM +0200, Avi Kivity wrote:On 03/21/2010 02:02 PM, Sebastian Hetze wrote:12:46:02 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 12:46:03 all 0,20 11,35 10,96 8,96 0,40 2,99 0,00 0,00 65,14 12:46:03 0 1,00 11,00 7,00 15,00 0,00 1,00 0,00 0,00 65,00 12:46:03 1 0,00 7,14 2,04 6,12 1,02 11,22 0,00 0,00 72,45 12:46:03 2 0,00 15,00 1,00 12,00 0,00 1,00 0,00 0,00 71,00 12:46:03 3 0,00 11,00 23,00 8,00 0,00 0,00 0,00 0,00 58,00 12:46:03 4 0,00 0,00 50,00 0,00 0,00 0,00 0,00 0,00 50,00 12:46:03 5 0,00 13,00 20,00 4,00 0,00 1,00 0,00 0,00 62,00 So it is only CPU4 that is showing this strange behaviour.Can you adjust irqtop to only count cpu4? or even just post a few 'cat /proc/interrupts' from that guest. Most likely the timer interrupt for cpu4 died.I've added two keys +/- to your irqtop to focus up and down in the row of available CPUs. The irqtop for CPU4 shows a constant number of 6 local timer interrupts per update, while the other CPUs show various higher values: irqtop for cpu 4 eth0 188 Rescheduling interrupts 162 Local timer interrupts 6 ata_piix 3 TLB shootdowns 1 Spurious interrupts 0 Machine check exceptions 0 irqtop for cpu 5 eth0 257 Local timer interrupts 251 Rescheduling interrupts 237 Spurious interrupts 0 Machine check exceptions 0 So the timer interrupt for cpu4 is not completely dead but somehow broken.
That is incredibly weird.
What can cause this problem? Any way to speed it up again?
The host has 8 cpus and is only running this 6 vcpu guest, yes? Can you confirm the other vcpus are ticking at 250 Hz?What does 'top' show running on cpu 4? Pressing 'f' 'j' will add a last-used-cpu field in the display.
Marcelo, any ideas? -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
