At 05:22 PM 7/15/2002, Jason R Thorpe wrote:
>On Tue, Jul 16, 2002 at 02:07:46AM +0200, Erik =C4ngg=E5rd wrote:
>
>  > Thanks for the tip, I'll compile a kernel with the power svaving stuff=
=20
> turned
>  > off when I get to work tomorrow and see if that makes any difference.=
=20
> As for the
>  > for the DOZE vs. NAP thing, if I understand the MPC7450 User's Manual=
=20
> correctly,
>  > it is not possible for software to put the CPU in DOZE mode on a 7450=
=20
> (as it is
>  > on a 7410). I guess that's why the netbsd code uses NAP for 7450=
 instead.
>
>Right, I understand that.  My tought in pointing it out was that perhaps
>NAP mode is more aggressive in saving power than DOZE mode, which is why
>you don't see this problem on the 7410.

BTW, NAP works fine on the 7450.  But on the Xserve with a 7455 NAP caused
very long latencies for interrupts.  Disabling powersave made things work
as expected.


--=20
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message