linux-kernel - Re: [PATCH 17/17] Add timekeeping documentation

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Message-ID: <4C196570.5080803@redhat.com>
Date:	Wed, 16 Jun 2010 13:59:44 -1000
From:	Zachary Amsden <zamsden@...hat.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	avi@...hat.com, mtosatti@...hat.com, glommer@...hat.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/17] Add timekeeping documentation

On 06/15/2010 10:27 AM, Randy Dunlap wrote:
> On Mon, 14 Jun 2010 21:34:19 -1000 Zachary Amsden wrote:
>
>    
>> Basic informational document about x86 timekeeping and how KVM
>> is affected.
>>      
> Nice job/information.  Thanks.
>
> Just some typos etc. inline below.
>    

Thanks for all the detailed feedback!  I'll include it all in the next 
revision.  I only have one response:
>
>> + low, the count is halted.  If the output is low when the gate is lowered, the
>> + output automatically goes high (this only affects timer 2).
>> +
>> +Mode 3: Square Wave.   This generates a sine wave.  The count determines the
>>      
> a sine wave is a square wave???
>    

Actually, yes.  The hardware output from timer 2 output goes through a 
low pass filter which effectively smooths the square wave to a sine to 
make the PC speaker sound somewhat less annoying.  I didn't have room to 
depict this in the schematic.  Of course, the counter output isn't 
directly a sine wave, and the LPF may not be all that effective, but it 
was the intent.

Zach
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