lkml.org 
[lkml]   [2007]   [Jun]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Device hang when offlining a CPU due to IRQ misrouting
From
> There exists a similar scenario.  Set the IRQ affinity to a
bunch of
> CPUs, watch /proc/interrupts to see which CPU is actually
servicing the
> interrupts, then offline that CPU. The kernel does not
reroute the IRQ
> to any of the other CPUs and the device also hangs.
>
> The furthest that I've dug is that it works on 2.6.17 and is
broken in
> 2.6.22-rc3 and 2.6.21. Will git-bisect further, but I
wanted to know if
> anyone else has seen this sort of problem. afaik, this
seems to happen
> with both IOAPIC and MSI interrupts, possibly more.
Hi,
As a side note, on my very old SMP machine, 2.6.20 correctly
load-balance IRQs across CPU but 2.6.21 not. I know that
in-kernel IRQ load balancer is marked as deprecated and
somewhat broken, but with your report it make me think it
could be a bug in the IRQ rerouting part in my case too and
not necessary in the load-balancer (decision) part.

Emmanuel.

---

Créez votre adresse électronique prenom.nom@laposte.net
1 Go d'espace de stockage, anti-spam et anti-virus intégrés.

-
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: 2007-06-02 00:03    [W:0.048 / U:0.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site