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RE: [Xen-devel] asterisk, ztdummy, and usb (and HZ = 100 under xen ???)

  • To: <Xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Fri, 20 May 2005 11:54:06 +1000
  • Delivery-date: Fri, 20 May 2005 01:53:35 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcVc0btLPjbh0lvTSRqDuStXM+bLOgACDbrAAAEnpNA=
  • Thread-topic: [Xen-devel] asterisk, ztdummy, and usb (and HZ = 100 under xen ???)

The x86 arch sets the kernel internal timer to 1000HZ by default, but
xen seems to set it to 100HZ (2.4 default).

The ztdummy driver makes the assumption that under 2.6, HZ = 1000, but
this isn't the case under xen which is probably the cause of all my

Is there a problem with me changing this, or is there a dynamic way to
change this???



> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: Friday, 20 May 2005 11:20
> To: James Harper; Xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] asterisk, ztdummy, and usb
> Reading the docs more closely, it looks like the ztdummy module under
> 2.6 kernel uses the rtc to generate interrupts at the required
> precision. What sort of rtc interface does xen give the domains?
> Thanks
> James

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