linux-kernel - Re: [RFC PATCH 0/14] Parallel memory initialisation

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Message-ID: <20150415142731.GI17717@twins.programming.kicks-ass.net>
Date:	Wed, 15 Apr 2015 16:27:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <waiman.long@...com>
Cc:	Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org>,
	Robin Holt <holt@....com>, Nathan Zimmer <nzimmer@....com>,
	Daniel Rahn <drahn@...e.com>,
	Davidlohr Bueso <dbueso@...e.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Tom Vaden <tom.vaden@...com>,
	Scott Norton <scott.norton@...com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/14] Parallel memory initialisation

On Wed, Apr 15, 2015 at 09:15:50AM -0400, Waiman Long wrote:
> I had included your patch with the 4.0 kernel and booted up a 16-socket
> 12-TB machine. I measured the elapsed time from the elilo prompt to the
> availability of ssh login. Without the patch, the bootup time was 404s. It
> was reduced to 298s with the patch. So there was about 100s reduction in
> bootup time (1/4 of the total).

But you cheat! :-)

How long between power on and the elilo prompt? Do the 100 seconds
matter on that time scale?
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