From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: [PATCH 0/2] Improve hpet accuracy
Date: Fri, 13 Jun 2008 08:33:57 +0100
Message-ID: <C477E175.19C24%keir.fraser@eu.citrix.com>
References: <20080612224736875.00000057128@djm-pc>
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To: "dan.magenheimer@oracle.com" <dan.magenheimer@oracle.com>, Dave Winchell <dwinchell@virtualiron.com>, xen-devel <xen-devel@lists.xensource.com>
Cc: Ben Guthro <bguthro@virtualiron.com>
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On 13/6/08 05:47, "Dan Magenheimer" <dan.magenheimer@oracle.com> wrote:

> I wondered what was different between apic=1 vs 0. Using:
> 
> # cat /proc/interrupts | grep 'LOC|timer'; sleep 10; \
>      cat /proc/interrupts | grep 'LOC|timer'
> 
> you can see that there are always 1000 LOC/sec.  But
> with apic=1 there are also about 350 IO-APIC-edge-timer/sec
> and with apic=0 there are 1000 XT-PIC-timer/sec.
> 
> I suspect that the latter of these (XT-PIC-timer) is
> messing up your policy and the former (edge-timer) is not.

I think apic=0 is not a particularly useful configuration though, right?

 -- Keir