From: "David S. Miller" <davem@redhat.com>
To: andrea@suse.de
Cc: akpm@digeo.com, davidsen@tmr.com, haveblue@us.ibm.com,
habanero@us.ibm.com, mbligh@aracnet.com,
linux-kernel@vger.kernel.org
Subject: Re: userspace irq balancer
Date: Mon, 26 May 2003 17:15:27 -0700 (PDT) [thread overview]
Message-ID: <20030526.171527.35691510.davem@redhat.com> (raw)
In-Reply-To: <20030527000639.GA3767@dualathlon.random>
From: Andrea Arcangeli <andrea@suse.de>
Date: Tue, 27 May 2003 02:06:39 +0200
On Mon, May 26, 2003 at 04:43:00PM -0700, David S. Miller wrote:
> softirq load? How much weight will softirq load get compared to
normally the softirq runs after the hardirq (commoncase) and you want to
run those softirq computations on the idle cpu too (i.e. no userspace
running so offload hardirq and in turn softqirq to it) No difference.
softirq is like hardirq just longer and with hardirq enabled. One more
reason to offload it to an idle cpu.
One hardirq can equate to thousands of packets worth of softirq load,
especially with NAPI. And you cannot even know what this ratio is
(packets processed per hardware IRQ load). It can be anywhere from
1 to 1000. And you absolutely do not want to behave identically
for all such values.
How can you even claim to be taking this into account in a logical
manner if you cannot even tell me how you will determine how much
softirq load is created by a hardware irq?
next prev parent reply other threads:[~2003-05-27 0:04 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-21 21:43 Nakajima, Jun
2003-05-22 0:29 ` Gerrit Huizenga
2003-05-22 1:28 ` Martin J. Bligh
2003-05-22 1:44 ` Gerrit Huizenga
2003-05-22 2:03 ` William Lee Irwin III
2003-05-22 2:04 ` William Lee Irwin III
2003-05-22 2:12 ` Zwane Mwaikambo
2003-05-22 3:57 ` Martin J. Bligh
2003-05-22 17:24 ` Bill Davidsen
2003-05-22 22:44 ` David S. Miller
2003-05-26 22:24 ` Andrea Arcangeli
2003-05-26 23:26 ` Andrew Morton
2003-05-26 23:34 ` Andrea Arcangeli
2003-05-26 23:43 ` David S. Miller
[not found] ` <20030527000639.GA3767@dualathlon.random>
2003-05-27 0:15 ` David S. Miller [this message]
2003-05-27 0:41 ` Andrea Arcangeli
2003-05-27 0:48 ` David S. Miller
2003-05-27 1:09 ` Andrea Arcangeli
2003-05-27 1:13 ` David S. Miller
2003-05-27 1:26 ` Andrea Arcangeli
2003-05-27 6:11 ` David S. Miller
2003-05-27 11:53 ` Andrea Arcangeli
2003-05-27 22:04 ` David S. Miller
2003-05-27 22:27 ` Andrea Arcangeli
2003-05-27 23:55 ` David S. Miller
2003-06-13 6:22 ` David S. Miller
2003-06-13 18:23 ` Andrea Arcangeli
2003-05-27 1:16 ` Dave Jones
2003-05-27 1:17 ` David S. Miller
2003-05-27 9:07 ` Arjan van de Ven
2003-05-27 9:10 ` David S. Miller
2003-05-27 1:28 ` Andrea Arcangeli
2003-05-27 1:53 ` William Lee Irwin III
2003-05-27 1:59 ` Andrew Morton
2003-05-27 2:10 ` William Lee Irwin III
2003-05-27 2:15 ` Zwane Mwaikambo
2003-05-27 2:44 ` William Lee Irwin III
2003-05-27 2:45 ` Zwane Mwaikambo
2003-05-27 4:22 ` William Lee Irwin III
2003-05-27 2:15 ` Andrea Arcangeli
2003-05-27 2:14 ` Andrea Arcangeli
2003-05-27 2:26 ` William Lee Irwin III
2003-05-27 1:17 ` Andrea Arcangeli
2003-05-27 1:20 ` David S. Miller
2003-05-27 1:33 ` Andrea Arcangeli
2003-05-22 14:18 ` James Cleverdon
2003-05-22 14:43 ` William Lee Irwin III
2003-05-22 15:30 ` James Cleverdon
2003-05-22 15:45 ` William Lee Irwin III
-- strict thread matches above, loose matches on Subject: below --
2003-05-24 1:10 Nakajima, Jun
2003-05-21 18:28 Keith Mannthey
2003-05-21 23:39 ` Keith Mannthey
2003-05-22 8:17 ` Arjan van de Ven
2003-05-21 16:31 James Bottomley
2003-05-21 20:16 ` Arjan van de Ven
2003-05-20 15:41 Nakajima, Jun
2003-05-21 13:54 ` James Cleverdon
2003-05-21 22:56 ` Zwane Mwaikambo
[not found] <200305191314.06216.pbadari@us.ibm.com>
2003-05-19 22:07 ` Dave Hansen
2003-05-19 22:11 ` Arjan van de Ven
2003-05-19 22:22 ` Dave Hansen
2003-05-20 3:25 ` David S. Miller
2003-05-20 3:46 ` William Lee Irwin III
2003-05-20 5:03 ` Dave Hansen
2003-05-20 5:53 ` Martin J. Bligh
2003-05-20 6:13 ` David S. Miller
2003-05-20 6:36 ` Dave Hansen
2003-05-20 6:40 ` David S. Miller
2003-05-20 14:07 ` Andrew Theurer
2003-05-20 14:21 ` Jeff Garzik
2003-05-20 14:35 ` Andrew Theurer
[not found] ` <20030520.163833.104040023.davem@redhat.com>
2003-05-21 14:58 ` Martin J. Bligh
2003-05-21 22:55 ` David S. Miller
2003-05-21 11:00 ` Kai Bankett
2003-05-20 14:01 ` Martin J. Bligh
2003-05-20 9:00 ` Arjan van de Ven
2003-05-20 9:14 ` William Lee Irwin III
2003-05-20 9:17 ` Andrew Morton
[not found] ` <20030520.172230.102567463.davem@redhat.com>
2003-05-21 14:27 ` James Cleverdon
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