lkml.org 
[lkml]   [2000]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: 2.2.15 driver OK on UP - no ints on SMP (SOLVED)
Date
Followup to:  <3964E2EB.C338FAB@timpanogas.com>
By author: "Jeff V. Merkey" <jmerkey@timpanogas.com>
In newsgroup: linux.dev.kernel
>
> Linus,
>
> When we were putting SMP on NetWare, we discovered that using the IOAPIC
> hardware for UP systems was almost 4% faster than the 8259-PIC for LAN
> drivers (since it has a dedicated ICC bus to pass interrupt messages to
> a local APIC). Something to consider....
>

The problem is that most UP mobos don't *have* IOAPIC's... Linux will
use them if they're there (most commonly on SMP mobos with only one
slot populated, or on mobos which have UP and SMP versions.)

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:57    [W:0.046 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site