Re: QEMU PIC indirection patch for in-kernel APIC work

Dong, Eddie
2007-04-05T13:50:27Z

Dor Laor wrote:
>
> Do you know why Xen guy choose of implementing it in Xen? Why didn't
> they rip Qemu implementation?
>
With PIC in Xen, CPU2K gets 6.5% performance gain in old 1000HZ linux
kernel, KB gets 14% gain. We also did a shared PIC model which share
PIC state among Qemu & VMM with less LOC in VMM, it can get
similar performance gain (5.8% in my test).
BTW, at that time, PIT is in VMM already.
Eddie