linux-kernel - Re: [RFC 2/2] Make x86 calibrate

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Message-ID: <20110331111323.GA24672@elte.hu>
Date:	Thu, 31 Mar 2011 13:13:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	Robin Holt <holt@....com>, Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC 2/2] Make x86 calibrate_delay run in parallel.


* Avi Kivity <avi@...hat.com> wrote:

> How important is udelay() for hardware timing these days, btw?

Seems popular enough:

  earth4:~/tip> git grep -w udelay drivers/ | wc -l
  4843

And while it's probably less important than it used to be, we cannot really 
know for sure. This is one of the rare occasions where some modest amount of 
fear, uncertainty and doubt is justified.

Thanks,

	Ingo
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