From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: "Màrius Montón" <marius.monton@uab.cat>
Subject: Re: [Qemu-devel] time inside qemu
Date: Fri, 29 Dec 2006 18:10:41 +0000 [thread overview]
Message-ID: <200612291810.41992.paul@codesourcery.com> (raw)
In-Reply-To: <45955621.2030301@uab.cat>
On Friday 29 December 2006 17:53, Màrius Montón wrote:
> Hi,
>
> As I understand, OSes running inside qemu "have" notion of time: (its
> date and time works, time(1) command works, etc.).
> My question is about how qemu manages time. I need to stop and start
> again this "virtual-time".
qemu doesn't maintain virtual time, it just uses the real host time.
> I just tried with cpu_disable_ticks() and cpu_enable_ticks(). It seems
> to work partially: at least now system date and time are out of sync..
I suspect you'll find that for anything other than very coarse user (ie. user
stop/continue) these are effectively useless.
Any benchmark/performance measurements you make inside qemu are meaningless.
qemu performance bears no relation whatsoever to the performance
characteristics of real hardware.
Paul
next prev parent reply other threads:[~2006-12-29 18:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-29 16:22 [Qemu-devel] time inside qemu Màrius Montón
2006-12-29 17:43 ` Paul Brook
2006-12-29 17:53 ` Màrius Montón
2006-12-29 18:10 ` Paul Brook [this message]
2007-04-16 14:41 ` Marius Monton
2007-04-16 15:12 ` Paul Brook
2007-04-17 14:05 ` Marius Monton
2007-04-17 14:22 ` Paul Brook
2007-04-16 21:59 ` Eduardo Felipe
2006-12-31 14:52 ` Markus Schiltknecht
-- strict thread matches above, loose matches on Subject: below --
2006-12-29 11:13 Màrius Montón
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