From: Sean Neakums <sneakums@zork.net>
To: linux-kernel@vger.kernel.org
Subject: Re: irq balancing; kernel vs. userspace
Date: Sun, 20 Apr 2003 19:55:03 +0100 [thread overview]
Message-ID: <6ur87xkni0.fsf@zork.zork.net> (raw)
In-Reply-To: <1050863476.1412.11.camel@laptop.fenrus.com> (Arjan van de Ven's message of "20 Apr 2003 20:31:16 +0200")
Arjan van de Ven <arjanv@redhat.com> writes:
> On Sun, 2003-04-20 at 15:23, Sean Neakums wrote:
>> I thought I'd play with the userspace IRQ-balancer, but booting with
>> noirqbalance seems not to not balance. Possibly I misunderstand how
>> this all fits together.
>
> this looks like you haven't started the userspace daemon (yet)
I just cranked it up, and now I see:
$ cat /proc/interrupts
CPU0 CPU1
0: 9627420 12189635 IO-APIC-edge timer
1: 4165 4347 IO-APIC-edge i8042
2: 0 0 XT-PIC cascade
4: 282749 315988 IO-APIC-edge serial
8: 2 1 IO-APIC-edge rtc
9: 3 2 IO-APIC-level eth1
10: 19270 20109 IO-APIC-level via82cxxx, eth0
11: 34913 19457 IO-APIC-level aic7xxx
12: 8777 8835 IO-APIC-edge i8042
NMI: 0 0
LOC: 21817495 21817494
ERR: 0
MIS: 0
I was confused at first because I was thinking of IRQ balancing as
balancing IRQs *across* CPUs. This kind of balancing seems to be
about spreading IRQ *sources* across CPUs. I guess it's good for
caches and whatnot for IRQs to be consistently serviced by the same
CPU.
Anyway, it seems to be working. Thanks!
--
Sean Neakums - <sneakums@zork.net>
next prev parent reply other threads:[~2003-04-20 18:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-20 3:11 Linux 2.5.68 Linus Torvalds
2003-04-20 4:57 ` Ben Collins
2003-04-20 13:23 ` irq balancing; kernel vs. userspace Sean Neakums
2003-04-20 18:31 ` Arjan van de Ven
2003-04-20 18:37 ` Kevin P. Fleming
2003-04-20 19:10 ` Arjan van de Ven
2003-04-20 18:55 ` Sean Neakums [this message]
2003-04-20 20:11 ` Zwane Mwaikambo
[not found] ` <Pine.LNX.4.50.0304201605360.17265-100000@montezuma.mastece nde.com>
2003-04-20 20:43 ` (OT) md5sum proving to be an EXCELLENT memory test Stephen Satchell
2003-04-20 21:58 ` Leonard Milcin, Jr
2003-04-20 23:45 ` Stephen Satchell
[not found] ` <3EA3EC75.35988618@gmx.de>
2003-04-21 13:46 ` Stephen Satchell
2003-04-23 19:33 ` 2.5.68: net/decnet/dn_route.c doesn't compile Adrian Bunk
2003-04-23 19:46 ` Steven Whitehouse
2003-04-22 21:54 irq balancing; kernel vs. userspace Bill Davidsen
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