linux-kernel - Re: Do we need to call calibrate_delay() for all cores/hyperthreads on a socket?

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Date:	Fri, 3 Dec 2010 16:41:09 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Robin Holt <holt@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...nel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>
Subject: Re: Do we need to call calibrate_delay() for all
 cores/hyperthreads on a socket?

> If, on the other hand, we do it per core, it ends up only reducing boot
> time by 121 seconds.  An improvement for sure, but not good enough to
> make me really happy ;).

If you parallelize it you can be even faster.
-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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