From: Mel Gorman <mgorman@suse.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <waiman.long@hp.com>, Linux-MM <linux-mm@kvack.org>,
Robin Holt <holt@sgi.com>, Nathan Zimmer <nzimmer@sgi.com>,
Daniel Rahn <drahn@suse.com>, Davidlohr Bueso <dbueso@suse.com>,
Dave Hansen <dave.hansen@intel.com>, Tom Vaden <tom.vaden@hp.com>,
Scott Norton <scott.norton@hp.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 0/14] Parallel memory initialisation
Date: Wed, 15 Apr 2015 15:34:20 +0100 [thread overview]
Message-ID: <20150415143420.GG14842@suse.de> (raw)
In-Reply-To: <20150415142731.GI17717@twins.programming.kicks-ass.net>
On Wed, Apr 15, 2015 at 04:27:31PM +0200, Peter Zijlstra wrote:
> 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?
Calling it cheating is a *bit* harsh as the POST times vary considerably
between manufacturers. While I'm interested in Waiman's answer, I'm told
that those that really care about minimising reboot times will use kexec
to avoid POST. The 100 seconds is 100 seconds, whether that is 25% in
all cases is a different matter.
--
Mel Gorman
SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <waiman.long@hp.com>, Linux-MM <linux-mm@kvack.org>,
Robin Holt <holt@sgi.com>, Nathan Zimmer <nzimmer@sgi.com>,
Daniel Rahn <drahn@suse.com>, Davidlohr Bueso <dbueso@suse.com>,
Dave Hansen <dave.hansen@intel.com>, Tom Vaden <tom.vaden@hp.com>,
Scott Norton <scott.norton@hp.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 0/14] Parallel memory initialisation
Date: Wed, 15 Apr 2015 15:34:20 +0100 [thread overview]
Message-ID: <20150415143420.GG14842@suse.de> (raw)
In-Reply-To: <20150415142731.GI17717@twins.programming.kicks-ass.net>
On Wed, Apr 15, 2015 at 04:27:31PM +0200, Peter Zijlstra wrote:
> 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?
Calling it cheating is a *bit* harsh as the POST times vary considerably
between manufacturers. While I'm interested in Waiman's answer, I'm told
that those that really care about minimising reboot times will use kexec
to avoid POST. The 100 seconds is 100 seconds, whether that is 25% in
all cases is a different matter.
--
Mel Gorman
SUSE Labs
--
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next prev parent reply other threads:[~2015-04-15 14:34 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-13 10:16 [RFC PATCH 0/14] Parallel memory initialisation Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 01/14] memblock: Introduce a for_each_reserved_mem_region iterator Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 02/14] mm: meminit: Move page initialization into a separate function Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 03/14] mm: meminit: Only set page reserved in the memblock region Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 04/14] mm: page_alloc: Pass PFN to __free_pages_bootmem Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 05/14] mm: meminit: Make __early_pfn_to_nid SMP-safe and introduce meminit_pfn_in_nid Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 06/14] mm: meminit: Inline some helper functions Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:16 ` [PATCH 07/14] mm: meminit: Partially initialise memory if CONFIG_DEFERRED_MEM_INIT is set Mel Gorman
2015-04-13 10:16 ` Mel Gorman
2015-04-13 10:17 ` [PATCH 08/14] mm: meminit: Initialise remaining memory in parallel with kswapd Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 10:17 ` [PATCH 09/14] mm: meminit: Minimise number of pfn->page lookups during initialisation Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 10:17 ` [PATCH 10/14] x86: mm: Enable deferred memory initialisation on x86-64 Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 18:21 ` Paul Bolle
2015-04-13 18:21 ` Paul Bolle
2015-04-13 10:17 ` [PATCH 11/14] mm: meminit: Control parallel memory initialisation from command line and config Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 10:17 ` [PATCH 12/14] mm: meminit: Free pages in large chunks where possible Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 10:17 ` [PATCH 13/14] mm: meminit: Reduce number of times pageblocks are set during initialisation Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 10:17 ` [PATCH 14/14] mm: meminit: Remove mminit_verify_page_links Mel Gorman
2015-04-13 10:17 ` Mel Gorman
2015-04-13 10:29 ` [RFC PATCH 0/14] Parallel memory initialisation Mel Gorman
2015-04-13 10:29 ` Mel Gorman
2015-04-15 13:15 ` Waiman Long
2015-04-15 13:38 ` Mel Gorman
2015-04-15 13:38 ` Mel Gorman
2015-04-15 14:50 ` Waiman Long
2015-04-15 14:50 ` Waiman Long
2015-04-15 15:44 ` Mel Gorman
2015-04-15 15:44 ` Mel Gorman
2015-04-15 21:37 ` nzimmer
2015-04-15 21:37 ` nzimmer
2015-04-16 18:20 ` Waiman Long
2015-04-15 14:27 ` Peter Zijlstra
2015-04-15 14:27 ` Peter Zijlstra
2015-04-15 14:34 ` Mel Gorman [this message]
2015-04-15 14:34 ` Mel Gorman
2015-04-15 14:48 ` Peter Zijlstra
2015-04-15 14:48 ` Peter Zijlstra
2015-04-15 16:18 ` Waiman Long
2015-04-15 16:18 ` Waiman Long
2015-04-15 16:42 ` Norton, Scott J
2015-04-15 16:42 ` Norton, Scott J
2015-04-16 7:25 ` Andrew Morton
2015-04-16 7:25 ` Andrew Morton
2015-04-16 8:46 ` Mel Gorman
2015-04-16 8:46 ` Mel Gorman
2015-04-16 17:26 ` Andrew Morton
2015-04-16 17:26 ` Andrew Morton
2015-04-16 17:37 ` Mel Gorman
2015-04-16 17:37 ` Mel Gorman
2015-04-16 7:51 Daniel J Blueman
2015-04-20 3:15 ` Daniel J Blueman
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