linux-kernel - Re: [RFC, PATCH 1/3] introduce SYS_CLONE

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Message-ID: <m1r6qtyskk.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 09 Apr 2007 18:35:39 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Robin Holt <holt@....com>
Cc:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC, PATCH 1/3] introduce SYS_CLONE_MASK

Robin Holt <holt@....com> writes:

> OK.  I just got the OK from management.  The system we were booting was
> for research only.  We had NR_CPUS=num_online_cpus()=4096 which were
> non-hyperthreaded.  With no attached I/O and the tweak I originally
> posted plus one change Jack has already gotten accepted, the machine
> booted in approx 12 minutes.

How much of that time was between the time the kernel was loaded
and before user space was started?

Twelve minutes sounds like a long time for a boot, if you aren't fsck'ing
filesystems.

Eric
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