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

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Date:	Tue, 6 Mar 2007 19:47:25 -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:
> 
> I did a user space program, attached to this mail.
> 
> I rewrote the reciprocal_div() for i386 so that one multiply is used.

Ok, this is definitely faster on Core 2 as well, so "numbers talk, 
bullshit walks". No more objections.

(That said, I bet you could do even better for octal and hex numbers, so 
if you *really* want to speed things up, you should just make a 
special-case routine for each base (there's just three of them), and you 
can then also optimize the base-10 thing much better (you can do two 
digits at a time by dividing by 100, etc)

		Linus
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