search for: opt_softtsc

Various versions of Linux under various circumstances select TSC as the primary clocksource for the kernel. This is especially true for uniprocessor kernels, but also in some cases for multiprocessor kernels. In most cases, this is because a processor bit (tsc_invariant? constant_tsc?) is passed through directly from the hardware via Xen and tested by the hvm guest and the result implies that

...red directly in the TSC offset fields of the vmx/smv control structures. Since pt_freeze_time and pt_thaw_time use hvm_get/set_guest_time, they now no longer freeze TSC time for a guest. So, for timer_mode 0, TSC time is no longer frozen when a VCPU is not running. Unless you''re using opt_softtsc, in which TSC exactly tracks the per-domain values. I have no love for timer_mode 0 (it has serious issues on SMP), but was this change intentional? Or am I perhaps missing something? - Frank _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com h...