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Re: [Qemu-devel] Slow clock in guest OS

From: Sergey Bychkov
Subject: Re: [Qemu-devel] Slow clock in guest OS
Date: Fri, 25 Jan 2008 13:51:58 +0200

----- Original Message ----- From: "Mulyadi Santosa" <address@hidden>
To: <address@hidden>
Sent: 25.01.2008 5:11

I can't understand why clock in guest OS (Windows 2003) goes very slow.

Are you sure the rtc freq has been made to 1024?
# cat /proc/sys/dev/rtc/max-user-freq
should yield 1024 before you ran qemu.

If yes, then we should hunt into another possibilities...

Yes, it helps, in some extent.
With rtc/max-user-freq set to 1024 and "-clock rtc" option VM now works like in 0.8.2 version. Clock is slower than in host, but Windows Time server could correct this, if started.
Busy host or guest CPU slows down clock.

Sometimes VM hangs on start. Htop shows that qemu uses 100% of second CPU in user mode. Internal QEMU VNC server listens port but doesn't accepts connections, so vncviewer hangs too. If used GUI, is shows monitor prompt, that doesn't accept any keyboard input. Could be killed by Ctrl-C in console or 'kill -9'. May be it's different problem but they happen both on the same host hardware.

Sergey Bychkow
ICQ: 21014758
FTN: 2:450/118.55

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