From: Avi Kivity <avi@redhat.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH][RESEND] Time drift again.
Date: Wed, 14 Jan 2009 19:34:48 +0200 [thread overview]
Message-ID: <496E2238.5050309@redhat.com> (raw)
In-Reply-To: <20090114170222.GE6431@shareable.org>
Jamie Lokier wrote:
> Gleb Natapov wrote:
>
>> After my last patch to fix interrupt coalescing was rejected
>> on the basis that it is too intrusive we decided to make the
>> fix much more localized and only fix the problem for RTC time
>> source. Unfortunately it is impossible to fix the problem entirely
>> inside RTC code like Andrzej proposed since Windows reads RTC
>> register C more then once on each time interrupt so it is impossible
>> to count reliably how many interrupt windows actually handled.
>> Proposed solution is localized to I386 target and is disabled by
>> default. To enable it "-rtc-td-hack" flag should be used.
>>
>
> I truly don't understand why the time correction is done by arcane
> guest-specific details like counting register reads, making interrupts
> behave different from real hardware, and only correcting guests which
> use particular clock sources - instead of simply warping virtual time
> (in all the places it's used) which might actually work on all targets
> and all guest OSes.
>
> I don't remember anybody responding to that suggestion.
> Was it a silly one?
>
Maybe it's silly, but I don't even understand it.
What do you mean by "warping virtual time"? I have a hard time with
these words even when used singly.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-01-14 17:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-14 11:59 [Qemu-devel] [PATCH][RESEND] Time drift again Gleb Natapov
2009-01-14 17:02 ` Jamie Lokier
2009-01-14 17:34 ` Avi Kivity [this message]
2009-01-15 13:53 ` Marcelo Tosatti
2009-01-15 20:12 ` Anthony Liguori
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