lkml.org 
[lkml]   [2002]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH][RFC] per isr in_progress markers

On Sun, 8 Sep 2002, Linus Torvalds wrote:

> As far as I can tell, the only time when this might be an advantage is
> an SMP machine with multiple devices sharing an extremely busy irq line.
> Then the per-isr in-progress bit allows multiple CPU's to actively
> handle several of the devices at the same time.
>
> Or is there some other case where this is helpful?

it could also improve latency of a faster interrupt source that shares its
irq line with a slow (but still frequent) handler. (such as SCSI or ne2k.)
This is both on UP and on SMP.

although this might be less of an issue these days.

Ingo

-
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 13:28    [W:0.072 / U:2.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site