[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] domU to dom0 switch question
On Fri, Apr 2, 2010 at 10:13 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
Thanks for reply. Sorry for unclear question. I read from the Xen paper dom0 is used for I/O backend driver - you also explain it - thanks. So if some domU wants to I/O, *and only one physical CPU*, domU gets unscheduled - dom0 scheduled - yes? My question 1 is, apart from I/O backend driver, is dom0 used for anything else? I assume application running on domU no I/O. Any other reason why domU will require the help of dom0. My question 2 is, domU requests some service (like page table update) using hypercall. Will this (executing the hypercall and related code) need dom0? My questions because, I want to understand the increased number of context switches and TLB cost (as reported in the paper "The cost of virtualization" by Ulrich Drepper) in the case of Xen. Thanks. J _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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