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From: Daniel Ionita <dionita@bitdefender.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] QEMU on windows timing problems
Date: Thu, 21 Jun 2007 19:07:41 +0300	[thread overview]
Message-ID: <368381804.20070621190741@bitdefender.com> (raw)


Hello.

I have a problem with time drifting inside the QEMU machine (running
XP SP2). This is more visible as the load inside the VM increases
(heavy hard-disk activity, almost 100% CPU usage). However, I need to
control some actions inside the VM machine which depend on time. Any
idea how I can increase QEMU's time resolution, to make it more exact?

I need something on the order of seconds. For example, on the latest
tests that I've done, in a total run of 7 minutes QEMU's clock lagged
by 4 minutes (so it's ~50% slower than real time).

Host machine x86, Windows, with kqemu installed. I mention that the
problem is much worse when I run QEMU in a SMP environment, but it is
fixable by setting process affinity to specific CPUs.

Thanks a lot.

-- 
Best regards,
 Daniel                          mailto:dionita@bitdefender.com

             reply	other threads:[~2007-06-21 16:08 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-21 16:07 Daniel Ionita [this message]
2007-06-21 20:20 ` [Qemu-devel] QEMU on windows timing problems Dor Laor

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