Unbalanced timer interrupts under VMWare?
I have a strange situation on a VMWare 5-hosted machine: # vmstat -i interrupt total rate irq1: atkbd0 74 0 irq6: fdc011 0 irq15: ata1 17 0 irq18: em0 42122 1 cpu0:timer 2246291 54 irq256: mpt0 141402 3 cpu1:timer280800 6 Total2710717 65 The cpu0 timer interrupt rate is 54 Hz and cpu1 rate is 6 Hz. The same is visible when monitoring the system in real time with systat -vm. This is a default FreeBSD 9 RC3 amd64 system, HZ is the default 100. Unless the tickless kernel project has advanced more than I think, this looks like a problem... so I looked elsewhere and it turns out I cannot get more than about 55 interrupts/s with the disk controller either. Any ideas? I have another host running VMware 5 but only an 8-stable machine in it, which works fine. Does anyone else run 9.x on VMware 5? The host is a Xeon X3360 CPU (4 cores, no HTT, 2.8 GHz). ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: Unbalanced timer interrupts under VMWare?
Hello! On Wed, Dec 21, 2011 at 12:02:04PM +0100, Ivan Voras wrote: I have a strange situation on a VMWare 5-hosted machine: # vmstat -i interrupt total rate irq1: atkbd0 74 0 irq6: fdc011 0 irq15: ata1 17 0 irq18: em0 42122 1 cpu0:timer 2246291 54 irq256: mpt0 141402 3 cpu1:timer280800 6 Total2710717 65 The cpu0 timer interrupt rate is 54 Hz and cpu1 rate is 6 Hz. The same is visible when monitoring the system in real time with systat -vm. This is a default FreeBSD 9 RC3 amd64 system, HZ is the default 100. Unless the tickless kernel project has advanced more than I think, It is, actually. Many thanks to mav@ for his amazing work. $ sysctl kern.eventtimer.periodic kern.eventtimer.periodic: 0 $ vmstat -i | grep timer cpu0:timer 72769640 47 And down to 37 i/s as seen in systat -vm. Idle virtual machine now takes 2 times less CPU on my laptop as seen from the host. this looks like a problem... so I looked elsewhere and it turns out I cannot get more than about 55 interrupts/s with the disk controller either. Happily goes to 6k i/s here (though it's under VirtualBox and a bit old -current, not 9.0). (Just in case: note that vmstat report rate since boot, systat -vm may be better to look at current values.) Any ideas? I have another host running VMware 5 but only an 8-stable machine in it, which works fine. Does anyone else run 9.x on VMware 5? The host is a Xeon X3360 CPU (4 cores, no HTT, 2.8 GHz). Maxim Dounin ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: Unbalanced timer interrupts under VMWare?
On 21.12.2011. 14:48, Maxim Dounin wrote: Hello! On Wed, Dec 21, 2011 at 12:02:04PM +0100, Ivan Voras wrote: Unless the tickless kernel project has advanced more than I think, It is, actually. Many thanks to mav@ for his amazing work. $ sysctl kern.eventtimer.periodic kern.eventtimer.periodic: 0 $ vmstat -i | grep timer cpu0:timer 72769640 47 Ah, great! I missed that commit :) Thanks mav! And down to 37 i/s as seen in systat -vm. Idle virtual machine now takes 2 times less CPU on my laptop as seen from the host. this looks like a problem... so I looked elsewhere and it turns out I cannot get more than about 55 interrupts/s with the disk controller either. Happily goes to 6k i/s here (though it's under VirtualBox and a bit old -current, not 9.0). Yes, it looks like it's not related to the tickless mode, the disk IO is slow even when kern.eventtimer.periodic=1. Something else is broken. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
