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Re: [Qemu-devel] [PATCH v3 0/7] RTC: New logic to emulate RTC
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/7] RTC: New logic to emulate RTC |
Date: |
Wed, 14 Mar 2012 09:54:16 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
Il 14/03/2012 09:52, 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.
No, why you're keeping roughly the same logic as current QEMU, instead
of the more radical changes that were in v2.
Paolo