lkml.org 
[lkml]   [2004]   [Mar]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] nmi_watchdog=2 and P4-HT
Philippe Elie <phil.el@wanadoo.fr> wrote:
>
> Hi,
>
> Actually with nmi_watchdog=2 and a P4 ht box the nmi is reflected
> only on logical processor 0, it's better to get it on both.

What do you mean by "reflected"? That the NMi is delivered to both
siblings but only appears in /proc/interrupts as being delivered to the
zeroeth?

> Note, if you test this patch, than on all x86 SMP and nmi_watchdog=2
> nmi occurs at 1000 hz (if the cpu is loaded) not at the intended 1 hz
> rate but that's a distinct problem.

nmi_watchdog=2 is local apic, and nmi_watchdog=1 is I/O apic, is that
correct?

I am showing the current behaviour:


nmi_watchdog=1: 1000 NMI/second, accounted to both siblings
nmi_watchdog=2: one NMI/second, accounted to sibling 0 only.

with your patch:

nmi_watchdog=1: 1000 NMI/second, accounted to both siblings
nmi_watchdog=2: 1000 NMI/second, accounted to both siblings

All of these are wrong, aren't they? We'd like to see one NMI per second,
on all siblings. I gues that's not possible for the IO APIC?

From the above it appears that you have a solution planned for the local
APIC at least, yes?
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:01    [W:0.059 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site