On Monday, October 08, 2012 11:32:54 PM Hans de Goede wrote: > Hi, > > On 10/08/2012 10:18 PM, Shawn Starr wrote: > > On Monday, October 08, 2012 10:10:49 PM Hans de Goede wrote: > >> Hi, > >> > >> On 10/08/2012 06:11 PM, Johannes Stezenbach wrote: > >> > >> <mega snip> > >> > >> > I also wonder if this is not a generic problem > >>> > >>> for all emulated hw if the driver uses some timeout? > >> > >> Yes it likely is, because the emulated timer interrupt will > >> try to make up for time lost when the vm was not running > >> (in either hypervisor or guest mode), while as hw emulation > >> code which has been pre-empted for what ever reason my > >> simply need some more actual running time before it can > >> complete the task as hand, at which point the timeout > >> will trigger sooner then the hw emulation can handle the > >> task ... > >> > >> Note that with the EHCI emulation we also can have the > >> 2 (guest and hw-emulation time) get out of sync in the > >> other way. When we got behind in processing frames > >> on the periodic schedule compared to "real-time" we would > >> catch up too fast, causing the guest to see large > >> jumps in the frindex register, which it does not like. > >> > >> So all of this really is a precarious balancing act, and > >> to get back to the subject of the thread, the latency > >> spikes some of the kernels debugging options can cause, > >> can upset the balance... > > > > Hello folks, > > > > I am using a non-debug kernel (because debug kernels are seriously > > sluggish). I may elect to get kernel-3.6.0-3.fc18 or kernel-3.6.1-1.fc18 > > from koji also since 3.6 is final now. > > > > Currently using: 3.6.0-0.rc7.git0.1.fc18.x86_64 > > Hmm, so were you using this at the time you hit the bug you reported > earlier too ? And can you reproduce that bug or was it a one > time occurence ? >
Need to retry, I triggered this with yahoo IM client in VM. I'll just go to 3.6.1 and try this again this week. When I did trigger this with 3.6.0-0.rc7.git0.1.fc18, it was repeatable. Thanks, Shawn. > Regards, > > Hans
