> -----Original Message----- > From: Paolo Bonzini [mailto:paolo.bonzini@xxxxxxxxx] On Behalf Of Paolo > Bonzini > Sent: Monday, February 20, 2012 3:41 PM > > On 02/20/2012 01:24 AM, Zhang, Yang Z wrote: > > Changes in v2: > > Add UIP check logic. > > Add logic that next second tick will occur in exactly 500ms later > > after setting the clock > > > > Current RTC emulation uses periodic timer(2 timers per second) to update RTC > clock. And it will stop CPU staying at deep C-state for long period. Our experience > shows the Pkg C6 residency reduced 6% when running 64 idle guest. > > The following patch stop the two periodic timer and only updating RTC clock > when guest try to read it. > > > > --- > > Yang Zhang (4): > > RTC: Update the RTC clock only when reading it > > RTC: Add RTC update-ended interrupt support > > RTC: Add alarm support > > RTC: Add UIP(update in progress) check logic > > > > hw/mc146818rtc.c | 447 > +++++++++++++++++++++++++++++++++++++----------------- > > 1 files changed, 308 insertions(+), 139 deletions(-) > > > > best regards > > yang > > > > -- > > To unsubscribe from this list: send the line "unsubscribe kvm" in the > > body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > > http://vger.kernel.org/majordomo-info.html > > > > Thanks, this looks much better! I'll run it through some tests. > > We also should try to keep migration working from older versions using the > load_old callback. Sure, I missed it. Will add it to the version 3. Any other comments? best regards yang -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
