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 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
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