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From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: Nick Piggin <npiggin@suse.de>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
	akpm@linux-foundation.org, mingo@elte.hu,
	linux-kernel@vger.kernel.org
Subject: Re: [patch] sched: optimize siblings status check logic in wake_idle()
Date: Sun, 4 Mar 2007 20:24:53 -0800	[thread overview]
Message-ID: <20070304202453.D27368@unix-os.sc.intel.com> (raw)
In-Reply-To: <20070305045831.GA2972@wotan.suse.de>; from npiggin@suse.de on Mon, Mar 05, 2007 at 05:58:31AM +0100

On Mon, Mar 05, 2007 at 05:58:31AM +0100, Nick Piggin wrote:
> On Sun, Mar 04, 2007 at 08:13:09PM -0800, Suresh B wrote:
> > On a 16 node system, we have seen ~1.25% perf improvement on a database workload
> > when we completely short circuited wake_idle(). This patch is trying to comeup
> > with a best compromise to avoid the cache misses and also minimize the latenices,
> > perf impact.
> 
> Hmm, I wonder what if we only wake_idle if the wakeup comes from this
> CPU or a sibling? That's probably going to have downsides in some
> workloads as well, though.

yep. I thought about it and thought this patch is a decent solution.

thanks,
suresh

      reply	other threads:[~2007-03-05  5:01 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-03  4:23 Siddha, Suresh B
2007-03-05  2:35 ` Nick Piggin
2007-03-05  4:13   ` Siddha, Suresh B
2007-03-05  4:58     ` Nick Piggin
2007-03-05  4:24       ` Siddha, Suresh B [this message]

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