From: Herbert Xu <[EMAIL PROTECTED]> Date: Fri, 21 Dec 2007 17:29:27 +0800
> On Fri, Dec 21, 2007 at 01:27:20AM -0800, David Miller wrote: > > > > It's two shifts, and this gets scheduled along with the other > > instructions on many cpus so it's effectively free. > > > > I don't see why this is even worth mentioning and discussing. > > I totally agree. Two shifts are way better than a branch. We take probably a thousand+ 100+ cycle cache misses in the TCP stack on big window openning ACKs. Instead of discussing ways to solve that huge performance killer we're wanking about two friggin' integer shifts. It's hilarious isn't it? :-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
