From: Arjan van de Ven <arjan@linux.intel.com>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-kernel@vger.kernel.org, Alan Piszcz <ap@solarrain.com>
Subject: Re: IRQ Balance Question for Single but Multi-Core Processors
Date: Sun, 24 Jun 2007 14:45:45 -0700 [thread overview]
Message-ID: <467EE609.9050908@linux.intel.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706241627470.5819@p34.internal.lan>
Justin Piszcz wrote:
> Question regarding the IRQ balance daemon and the 2.6.x kernel.
>
> For a single-processor but dual or quad core CPU, should one be running
> the IRQ balancing daemon, will it result in increased performance?
it's a tradeoff.
for cores/threads that share cache, there's no point to run a daemon
all the time, they share so many resources that things don't really
matter.....
irqbalance will, as a result, set up a one time static mapping and
then exit on such systems; this will give a "reasonable" spread of
interrupts, but won't cost you any cpu after that.
On "real" smp systems, the performance and power tradeoffs are
different and there irqbalance will keep an eye on things over time...
prev parent reply other threads:[~2007-06-24 21:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-24 20:29 IRQ Balance Question for Single but Multi-Core Processors Justin Piszcz
2007-06-24 20:54 ` Jan Engelhardt
2007-06-24 21:45 ` Arjan van de Ven [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=467EE609.9050908@linux.intel.com \
--to=arjan@linux.intel.com \
--cc=ap@solarrain.com \
--cc=jpiszcz@lucidpixels.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox