linux-kernel - Re: [RFC 0/2] Delay initializing of large sections of memory

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Message-ID: <CAE9FiQWWj8btGK68j6MO1iYwSXiF54h7SqrHCxKwXW5=fnb_0A@mail.gmail.com>
Date:	Fri, 21 Jun 2013 13:28:11 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Robin Holt <holt@....com>,
	Mike Travis <travis@....com>, Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	linux-doc@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/2] Delay initializing of large sections of memory

On Fri, Jun 21, 2013 at 12:19 PM, Nathan Zimmer <nzimmer@....com> wrote:
> On 06/21/2013 02:10 PM, Yinghai Lu wrote:
>> in this way we can keep all numa etc on the place when online ram, cpu,
>> pci...
>>
>> For example if we have 32 sockets system, most time for boot is with
>> *BIOS*
>> instead of OS. In those kind of system boot is like this way:
>> only first two sockets get booted from bios to OS.
>> later use hot add every other two sockets.
>>
>> that will also make BIOS simpler, and it need to support hot-add for
>> services purpose anyway.
>>
> Yes the hot add path was one option we looked at and it did shorten boot
> times but the goal I had here is to get from power on to having the full
> machine available as quick as possible. Several clients need significant
> portions of ram for their key workloads.  So that guided my thoughts on this
> patch.

you mean boot small number sockets + hot add still take more time?
hot add ram still in serialize mode?

Yinghai
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