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

  • To: "Kip Macy" <kmacy@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
  • Date: Mon, 9 May 2005 06:21:03 +0100
  • Delivery-date: Mon, 09 May 2005 05:20:39 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcVUC92DGsXt1KkzRJ6p1rJ3Mk+2TwASstQw
  • Thread-topic: [Xen-devel] [PATCH] Make HZ a boot-time configurable

> 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


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