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RE: [Xen-devel] [PATCH] Make HZ a boot-time configurable

To: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] Make HZ a boot-time configurable
From: Kip Macy <kmacy@xxxxxxxxxx>
Date: Sun, 8 May 2005 22:26:34 -0700 (PDT)
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That would be ideal, I wasn't aware that that was up for discussion.


                                -Kip

On Mon, 9 May 2005, Ian Pratt wrote:

> 
> > I understand the trade-offs that xen is currently optimized 
> > for. However, I don't think that HZ=100 is right for all 
> > places and all times. I also think that users would 
> > appreciate it if they didn't have to go edit config.h and 
> > re-compile if they wanted to change HZ. For those using xen 
> > as a platform for development it probably makes sense if HZ 
> > is the same as the kernel they intend to ship. For example, 
> > very early on in testing with HZ=1000 I hit an interrupt race 
> > condition in XenFreeBSD that I have never seen before.
> 
> I'd really prefer to kill the periodic ticker in Xen altogether. If
> domains want a periodic ticker they should just set their alarm timer
> appropriately.
> 
> Ian
> 
> 
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> 

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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