Hi, All: Does the guest OS need to detect hyperthreading? One would think that the hypervisor decides what to schedule on what CPU, and the job of the guest is not to be too smart for its own good. So, my first reaction was to comment detect_ht() altogether. Fedora Core 5 has the code in detect_ht(), though I have no idea what the results of this are on HT CPUs, if they match the reality. Thanks, -- Pete _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On 29 May 2006, at 23:22, Pete Zaitcev wrote:> Does the guest OS need to detect hyperthreading? One would think that > the hypervisor decides what to schedule on what CPU, and the job of > the guest is not to be too smart for its own good. So, my first > reaction was to comment detect_ht() altogether. > > Fedora Core 5 has the code in detect_ht(), though I have no idea what > the results of this are on HT CPUs, if they match the reality.We fake out core and sibling maps in our own drivers/xen/core/smpboot.c. identify_cpu() is called only for the first VCPU, mainly to get common info like CPU make and model and features. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On 5/29/06, Pete Zaitcev <zaitcev@redhat.com> wrote:> Fedora Core 5 has the code in detect_ht(), though I have no idea what > the results of this are on HT CPUs, if they match the reality.X86_HT is disabled in arch/i386/Kconfig in the xen-unstable Linux kernel. christian _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel