On Mon, Oct 27, 2008 at 04:36:38PM +0800, Zhang, Xiantao wrote: > Isaku Yamahata wrote: > > On Fri, Oct 24, 2008 at 09:59:58AM +0800, Zhang, Jingke wrote: > >> 3. IPF-Xen can not boot up domain with dom_id > 62 (not > >> regression, should be there for a long time) > > > > Long ago, I posted the patch to address this issue. > > Probably there are two ways. (Is there other better way?) > > > > a.) abandon the rid partitioning, and flush mTLB every time vcpu > > context switch. > > Current kvm adopts this method, we didn't find any performance regression > through benchmark. But sine the architecture difference between xen and kvm, > so maybe should investigate more through enough benchmark data.
Sounds interesting. > > (some bits of rid space needs to be reserved for real mode > > emulation.) > > > > b.) keep the rid partitioning and allow rid collision. > > When vcpu context switch, check the rid collision and > > flush mTLB if necessary. > > > > Benchmark would be necessary to decide which one is better and > > to estimate performance degradation. > > I implemented b). However no one has implemented a). > > So no further step was taken. > > I thought Jingke isn't saying this topic. What he found maybe he failed to > create the domain when the domain is created and destoryed continuously for > more 62 times. Seems the issue is from the the algorithm for deallocating > rid blocks doesn't work, when destroying the guest. Oh I see. Thank you for the explanation. -- yamahata _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
