Hi Everyone, I need to do some profiling on Xen Virtual machine. I have a query here: * Like VMWare, Can Xen Guest emulates the TSC CPU register??? if Yes, then how is the performance of this TSC register as I read that VmWare very poorly emulates the TSC register. I am using Xen-26.18 kernel image from xen -3.1.0 package Thanks for your comments. Cheers:) Himanshu ---------------------------------------------- _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Tom Horsley
2007-Nov-02 21:49 UTC
Re: [Xen-users] Xen support for emulating TSC register!!
On Fri, 2 Nov 2007 16:19:29 -0400 "techy geek" <techygeek72@gmail.com> wrote:> Hi Everyone, > > I need to do some profiling on Xen Virtual machine. I have a query here: > > * Like VMWare, Can Xen Guest emulates the TSC CPU register??? if Yes, then > how is the performance of this TSC register as I read that VmWare very > poorly emulates the TSC register.I suspect "poor" describes Xen as well. I keep seeing messages on the console of various HVM''s I have which say something about unstable TSC values off by some 6 or 7 digit number of cycles. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Can Anyone let me know how to enable/disbale the TSC Emulation register on Xen Guest (XenU)??? Suppose I wanna use the apparent time of Host OS instead of using emulated TSC register, how can I configure to use it?? Cheers:) Himanshu On 11/2/07, Tom Horsley <tom.horsley@att.net> wrote:> > On Fri, 2 Nov 2007 16:19:29 -0400 > "techy geek" <techygeek72@gmail.com> wrote: > > > Hi Everyone, > > > > I need to do some profiling on Xen Virtual machine. I have a query > here: > > > > * Like VMWare, Can Xen Guest emulates the TSC CPU register??? if Yes, > then > > how is the performance of this TSC register as I read that VmWare very > > poorly emulates the TSC register. > > I suspect "poor" describes Xen as well. I keep seeing messages on the > console of various HVM''s I have which say something about unstable TSC > values off by some 6 or 7 digit number of cycles. > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users