Re: ACPI interrupt storm (was Re: Linux 2.4.21rc6-ac1)

[Con Kolivas <kernel@kolivas.org>]

On Sun, 1 Jun 2003 17:23, Zwane Mwaikambo wrote:
> On Sun, 1 Jun 2003, Con Kolivas wrote:
> > I get the same problem here with acpi-20030522 applied to rc6
> > P4 2.53 on an i845 mobo (P4PE).
>
> I think it could be the Bus Mastering event monitoring thing, can you
> shoehorn this (HACK HACK) patch into 2.4?
>
> Index: linux-2.5.70-mm1/drivers/acpi/processor.c
> ===================================================================
> RCS file: /build/cvsroot/linux-2.5.70/drivers/acpi/processor.c,v
> retrieving revision 1.1.1.1
> diff -u -p -B -r1.1.1.1 processor.c
> --- linux-2.5.70-mm1/drivers/acpi/processor.c	27 May 2003 02:19:28
> -0000	1.1.1.1 +++ linux-2.5.70-mm1/drivers/acpi/processor.c	29 May 2003
> 11:32:00 -0000 @@ -711,11 +711,13 @@ acpi_processor_get_power_info (
>  		 * use this in our C3 policy.
>  		 */
>  		else {
> +			goto done;
>  			pr->power.states[ACPI_STATE_C3].valid = 1;
>  			pr->power.states[ACPI_STATE_C3].latency_ticks =
>  				US_TO_PM_TIMER_TICKS(acpi_fadt.plvl3_lat);
>  			pr->flags.bm_check = 1;
>  		}
> +		done:
>  	}
>
>  	/*

Ok I tried this hack. 

Here is vmstat before:
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0      0 494640   4088   6628    0    0     0   240 82011    34  0  1 99  
and after:
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0      0 494700   4052   6608    0    0     0   136 82182    32  0  1 99  

so it managed to give me another 100 or so interrupts on top of the 80k I was 
already getting; ie not much help
at about the same time I got a minor file system corruption but too many 
things happened together so I'm really not sure what that was.

Con