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Message-ID: <45A71DEA.9020307@redhat.com> Date: Fri, 12 Jan 2007 00:34:34 -0500 From: Rik van Riel <riel@...hat.com> To: Avi Kivity <avi@...ranet.com> CC: Ingo Molnar <mingo@...e.hu>, kvm-devel <kvm-devel@...ts.sourceforge.net>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: kvm & dyntick Avi Kivity wrote: > dyntick-enabled guest: > - reduce the load on the host when the guest is idling > (currently an idle guest consumes a few percent cpu) You do not need dynticks for this actually. Simple no-tick-on-idle like Xen has works well enough. While you're modifying the timer code, you might also want to add proper accounting for steal time. Time during which your guest had a runnable process, but was not actually running itself, should not be accounted against the currently running process. I wonder if it would be possible to simply copy some of the timer code from Xen. They have the timing quirks worked out very well and their timer_interrupt() is pretty nice code. (Now I need to buy myself another VT box so I can help out with KVM :)) http://virt.kernelnewbies.org/ParavirtBenefits has some other features you may want to have :))) -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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