[CentOS] compaq R4000 update (hogging interrupts)

Wed Dec 14 15:50:31 UTC 2005
Johnny Hughes <mailing-lists at hughesjr.com>

On Wed, 2005-12-14 at 08:49 -0500, Jerry Geis wrote:
> After a couple hours last night....
> 
> doing a "killall -SIGUSR1 cpuspeed" bumps up the /proc/cpuinfo
> information for cpu mhz to 2393 Mhz. I did notice a little increase
> after that. However, the machine is still sluggish.
> 
> I did a "hdparm -c 1 /dev/hda" but really did not notice any difference.
> 
> I tried to download fglrx64_6_8_0_8.16.20-1.x86_64.rpm from ati
> (also 8.20.8) and get the screen to be in 1280x800. This did not work.
> The screen pops up initially for the boot process but then goes black.
> I waited quite some time but nothing ever showed on screen.
> Screen is still 800x600.
> 
> Anyone have experience with the ati radeon 200M Express setup?
There is a bug in the newest xorg with ATI cards ... 

This may provide some help:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=170008

> 
> Anyway at this time I am disappointed so far. the reason for buying
> this model (performance and portable) does not seem to be performing
> very well.
> 
> I continue to search for ways to setup the screen and find these lost 
> cycles...
> 

Turn off cpuspeed altogether ...

chkconfig cpuspeed off

(reboot)

> One thing in dmesg output is :
> 
> ACPI: PCI interrupt link IRQs 10 11 *0, disabled????? Not sure what this 
> is about.
> 
> ************ I just noticed something else in dmesg... (entire dmesg 
> posted below)
> 
> waring: many lost ticks.
> Your time source seems to be instable or some driver is hogging interutps
> rip __do_softirq+0x41/0xa2
> 
> Any ideas on that?

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