linux-kernel - Re: [patch v2] epoll use a single inode ...

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Message-ID: <Pine.LNX.4.64.0703060917500.5963@woody.linux-foundation.org>
Date:	Tue, 6 Mar 2007 09:19:30 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch v2] epoll use a single inode ...



On Tue, 6 Mar 2007, Eric Dumazet wrote:
> 
> Something like :
> 
> [PATCH] : Use reciprocal divides in sprintf()

Try this on Core 2, and I suspect that you'll find that the hardware is 
actually *faster* than doing the shift/test, function call and the 
two multiplies.

> Using reciprocal divides permits to change each divide by two multiplies, less 
> expensive on current CPUS.

Are you sure?

		Linus
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