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Re: [Qemu-devel] [PATCH v3 0/7] RTC: New logic to emulate RTC
From: |
Zhang, Yang Z |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/7] RTC: New logic to emulate RTC |
Date: |
Wed, 14 Mar 2012 08:52:22 +0000 |
> -----Original Message-----
> From: Paolo Bonzini [mailto:address@hidden
> Sent: Wednesday, March 14, 2012 4:35 PM
> To: Zhang, Yang Z
> Cc: address@hidden; Jan Kiszka; address@hidden;
> address@hidden; Marcelo Tosatti
> Subject: Re: [PATCH v3 0/7] RTC: New logic to emulate RTC
>
> Il 14/03/2012 01:00, Zhang, Yang Z ha scritto:
> > Is there any comments with the version 3?
>
> Can you explain why you dropped the logic to set the timer to the next
> event?
Do you mean why I change the rtc logic? The reason is that: When a guest is
idle, the main activity inside qemu is the rtc update timer(2 per second). In
our experience(running 64 rhel6u1 guests), it will decrease pkg C6 residency
about 6%(6% means 2 watts in my box). And normally, the guest will not use the
update-end interrupt and alarm. So there has no need to run a periodic timer
when guest isn't using it.
best regards
yang