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Date: Mon, 28 Jan 2002 11:19:58 -0500
From: Thomas Hood <jdthood@mail.com>
Subject: Re: 2.4.18-pre7 slow ... apm problem
In-Reply-To: <E16VBgH-0000Z4-00@the-village.bc.nu>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, Stephen Rothwell <sfr@canb.auug.org.au>
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On Mon, 2002-01-28 at 08:18, Alan Cox wrote:
> We don't know how VMware switches between virtual machines. If that
> switch is done behind Linux back, then VMware is effectively special.
> It is virtualising the system and it has to virtualise APM status too.
> If its doing the switch when it is a current foreground process then
> it wouldnt explain the problem

VMware is essentially a hardware emulator, so if the guest OS is
idling the CPU it should only be idling the virtual CPU, not the
real one.  

Having said that, VMware emulates a lot of hardware by making
use of facilities that Linux provides.  It emulates a super-VGA
card by making use of X, for example.  Do you suppose that
VMware emulates CPU slowing by slowing the real CPU?  I hope not.

Since VMware is closed source software we needn't worry our
heads too much about this problem.  VMware users have a 
workaround: set idle_threshold to 100.

Can we get more info about the keyboard repeat rate slowing?

--
Thomas

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