Avi Kivity wrote: > On 07/06/2009 04:42 PM, Dong, Eddie wrote: >> EOI is one of key VM Exit at high bandwidth IO such as VT-d >> with 10Gb/s NIC. This patch accelerate guest EOI emulation >> utilizing HW VM Exit information. >> > > Won't this fail if the guest uses STOSD to issue the EOI? > Good catch, should we use an exclusion list for the opcode? Or use decode cache for hot IP (RO in EPT for gip)? We noticed huge amount of vEOI in 10Gb/s NIC which is ~70KHZ for EOI. With SR-IOV, it could go up much more to even million level. Decode and emulation cost 7K cycles, while short path may only spend 3-4K cycles. Eddie-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
