Messages in this thread | | | Subject | Re: [PATCH] Add I/O hypercalls for i386 paravirt | From | Benjamin Herrenschmidt <> | Date | Mon, 27 Aug 2007 19:54:41 +0200 |
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On Wed, 2007-08-22 at 16:25 +1000, Rusty Russell wrote: > On Wed, 2007-08-22 at 08:34 +0300, Avi Kivity wrote: > > Zachary Amsden wrote: > > > This patch provides hypercalls for the i386 port I/O instructions, > > > which vastly helps guests which use native-style drivers. For certain > > > VMI workloads, this provides a performance boost of up to 30%. We > > > expect KVM and lguest to be able to achieve similar gains on I/O > > > intensive workloads. > > > > Won't these workloads be better off using paravirtualized drivers? > > i.e., do the native drivers with paravirt I/O instructions get anywhere > > near the performance of paravirt drivers? > > This patch also means I can kill off the emulation code in > drivers/lguest/core.c, which is a real relief.
Hrm... how do you deal with X doing IOs ?
Ben.
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