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Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy lo
From: |
David S. Ahern |
Subject: |
Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load. |
Date: |
Thu, 06 Nov 2008 10:28:44 -0700 |
User-agent: |
Thunderbird 2.0.0.16 (X11/20080723) |
Dor Laor wrote:
> Gleb Natapov wrote:
>> On Fri, Oct 31, 2008 at 02:17:19PM -0500, Anthony Liguori wrote:
>>
>>> Gleb Natapov wrote:
>>>
>>>> Qemu device emulation for timers might be inaccurate and
>>>> causes coalescing of several IRQs into one. It happens when the
>>>> load on the host is high and the guest did not manage to ack the
>>>> previous IRQ. The problem can be reproduced by copying of a big
>>>> file or many small ones inside Windows guest. When you do that guest
>>>> clock start to lag behind the host one.
<snip>
>>
>>
>>> How do
>>> Linux guests behave with this?
>>>
>> Linux guests don't use pit or RTC for time keeping. They are completely
>> unaffected by those patches.
>>
>>
> It will probably also drift with clock=pit in the guest kernel cmdline.
It is my understanding that for linux guests using a 2.4 kernel (e.g.,
RHEL3) the PIT is the only option.
david
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., (continued)
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., andrzej zaborowski, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., andrzej zaborowski, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Anthony Liguori, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., andrzej zaborowski, 2008/11/07
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/08
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Paul Brook, 2008/11/06
Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/05
Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load.,
David S. Ahern <=
Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Anthony Liguori, 2008/11/05
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Jamie Lokier, 2008/11/05
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Anthony Liguori, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Paul Brook, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Anthony Liguori, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Anthony Liguori, 2008/11/06
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Gleb Natapov, 2008/11/08
- Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load., Dor Laor, 2008/11/08