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Re: [Qemu-devel] Rethinking missed tick catchup
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] Rethinking missed tick catchup |
Date: |
Wed, 12 Sep 2012 17:42:58 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-09-12 17:06, Gleb Natapov wrote:
>>>> Are there other issues with reinjection that people are aware of? Does
>>>> anything seem obviously wrong with the above?
>>>
>>> We should take the chance and design everything in a way that the HPET
>>> can finally be (left) enabled.
>>
>> I thought the issue with the HPET was access frequency and the cost of
>> heavy weight exits.
>>
>> I don't have concrete data here. I've only heard it second hand. Can
>> anyone comment more?
>>
> There is no any reason whatsoever to emulate HPET for Windows. It will
> make it slower. Hyper-V does not emulate it. For proper time support in
> Windows we need to implement relevant part of Hyper-V spec.
There are two reasons to do it nevertheless:
- QEMU is not Hyper-V. We are emulating the HPET already, and we
expose it by default. So we should do it properly.
- The time drift fix for the RTC is still a hack. Adding a second user
would force us to finally clean it up.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux
Re: [Qemu-devel] Rethinking missed tick catchup, Gleb Natapov, 2012/09/12
- Re: [Qemu-devel] Rethinking missed tick catchup, Anthony Liguori, 2012/09/12
- Re: [Qemu-devel] Rethinking missed tick catchup, Gleb Natapov, 2012/09/13
- Re: [Qemu-devel] Rethinking missed tick catchup, Eric Blake, 2012/09/13
- Re: [Qemu-devel] Rethinking missed tick catchup, Daniel P. Berrange, 2012/09/13
- Re: [Qemu-devel] Rethinking missed tick catchup, Anthony Liguori, 2012/09/13
- Re: [Qemu-devel] Rethinking missed tick catchup, Gleb Natapov, 2012/09/13
- Re: [Qemu-devel] Rethinking missed tick catchup, Avi Kivity, 2012/09/13