From: Jesse Barnes <jbarnes@engr.sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: "Martin J. Bligh" <mbligh@aracnet.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
John Hawkes <hawkes@sgi.com>
Subject: Re: [PATCH] reduce inter-node balancing frequency
Date: Sat, 17 Jul 2004 12:44:11 -0400 [thread overview]
Message-ID: <200407171244.11008.jbarnes@engr.sgi.com> (raw)
In-Reply-To: <40F8965E.6070809@yahoo.com.au>
On Friday, July 16, 2004 11:00 pm, Nick Piggin wrote:
> Out of interest, what sort of performance problems are you seeing with
> this high rate of global balancing? I have a couple of patches to cut down
> runqueue locking to almost zero in interrupt paths, although I imagine the
> main problem you are having is pulling a cacheline off every remote CPU
> when calculating runqueue loads?
John might remember the details, I didn't get a backtrace this time. When we
boot with the default values on a 512p system, it livelocks shortly after
init starts. I *think* what's happening is that a the global rebalance value
is shorter than the time it takes to do the global rebalance, due to
cacheline contention.
Jesse
next prev parent reply other threads:[~2004-07-17 16:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-15 22:29 [PATCH] reduce inter-node balancing frequency Jesse Barnes
2004-07-16 0:14 ` Martin J. Bligh
2004-07-16 0:38 ` Jesse Barnes
2004-07-16 1:48 ` Nick Piggin
2004-07-16 1:58 ` Jesse Barnes
2004-07-16 5:40 ` Martin J. Bligh
2004-07-16 5:53 ` Nick Piggin
2004-07-16 14:45 ` Jesse Barnes
2004-07-16 15:04 ` Chris Wedgwood
2004-07-16 15:30 ` Jesse Barnes
2004-07-17 3:00 ` Nick Piggin
2004-07-17 16:44 ` Jesse Barnes [this message]
2004-07-16 14:42 ` Jesse Barnes
2004-07-18 13:12 ` Jes Sorensen
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=200407171244.11008.jbarnes@engr.sgi.com \
--to=jbarnes@engr.sgi.com \
--cc=hawkes@sgi.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mbligh@aracnet.com \
--cc=nickpiggin@yahoo.com.au \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.