From: Paolo Bonzini <pbonzini@redhat.com>
To: "Zhang, Yang Z" <yang.z.zhang@intel.com>
Cc: "aliguori@us.ibm.com" <aliguori@us.ibm.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Jan Kiszka <jan.kiszka@web.de>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] [PATCH v3 0/7] RTC: New logic to emulate RTC
Date: Wed, 14 Mar 2012 09:54:16 +0100 [thread overview]
Message-ID: <4F605CB8.20200@redhat.com> (raw)
In-Reply-To: <A9667DDFB95DB7438FA9D7D576C3D87E095B91@SHSMSX101.ccr.corp.intel.com>
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
next prev parent reply other threads:[~2012-03-14 8:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 0:00 [Qemu-devel] [PATCH v3 0/7] RTC: New logic to emulate RTC Zhang, Yang Z
2012-03-14 8:34 ` Paolo Bonzini
2012-03-14 8:52 ` Zhang, Yang Z
2012-03-14 8:54 ` Paolo Bonzini [this message]
2012-03-15 0:06 ` Zhang, Yang Z
2012-03-15 9:34 ` Paolo Bonzini
-- strict thread matches above, loose matches on Subject: below --
2012-03-02 6:58 Zhang, Yang Z
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