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RE: [Xen-users] How to raise HZ to 1000 properly?

To: "David Muench" <davemuench@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] How to raise HZ to 1000 properly?
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Wed, 23 Nov 2005 10:12:43 -0000
Cc: ian.pratt@xxxxxxxxxxxx
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Thread-index: AcXv1eLP/j/VHqXDTXCWaHmGHAdA4AAQHqlA
Thread-topic: [Xen-users] How to raise HZ to 1000 properly?
> I've been redoing my Asterisk domU, and decided to do it 
> correctly this time. This time I'm using zaptel and ztdummy, 
> and that requires HZ to be set to 1000. I've managed to do 
> this, and Asterisk works great with ztdummy, but I don't 
> think I did it correctly. I've changed 
> include/asm-xen/asm/param.h thusly:
> #ifdef __KERNEL__
> # define HZ             1000            /* Internal kernel 
> timer frequency */
> # define USER_HZ        1000            /* .. some user interfaces are
> in "ticks" */
> # define CLOCKS_PER_SEC         (USER_HZ)       /* like times() */
> #endif
> #ifndef HZ
> #define HZ 1000
> #endif
> And like I said, it works. But my bogomips are now 25100.28, 
> whereas my other domU's are more like 2300-2400.
> What's the right way to do this?

To get the acuracy you need you'll need to adjust the parameter in
xen/include/asm-x86/config.h too


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