Date: Wed, 21 Dec 2011 15:54:30 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: Unbalanced timer interrupts under VMWare? Message-ID: <jcsrv7$fuf$1@dough.gmane.org> In-Reply-To: <20111221134852.GT67687@mdounin.ru> References: <jcsebc$d7n$1@dough.gmane.org> <20111221134852.GT67687@mdounin.ru>
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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.
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