From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753441AbbCWTOJ (ORCPT ); Mon, 23 Mar 2015 15:14:09 -0400 Received: from shards.monkeyblade.net ([149.20.54.216]:57345 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753188AbbCWTOH (ORCPT ); Mon, 23 Mar 2015 15:14:07 -0400 Date: Mon, 23 Mar 2015 15:14:04 -0400 (EDT) Message-Id: <20150323.151404.1989243978087546169.davem@davemloft.net> To: torvalds@linux-foundation.org Cc: akpm@linux-foundation.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT] Sparc From: David Miller In-Reply-To: References: <20150323.125537.767987027704780801.davem@davemloft.net> X-Mailer: Mew version 6.5 on Emacs 24.1 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Mon, 23 Mar 2015 12:14:06 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Linus Torvalds Date: Mon, 23 Mar 2015 10:12:30 -0700 > Oh well. I'm actually somewhat surprised this didn't hit anything > else. Doesn't networking also end up doing overlapping memmove() on > the skb data occasionally? The only case I can think of is when {en,de}capsulating VLANs in software. But those are really small header sized copies, and would never trigger the unrolled loop which requires len >= 128. A quick grep shows something similar for wireless WEP/WPA, but not only are these small copies too but I don't have any wireless on any of my sparc boxes :-) It really is just SLAB/SLUB with large NR_CPU configurations.