From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751585AbdISWBt (ORCPT ); Tue, 19 Sep 2017 18:01:49 -0400 Received: from shards.monkeyblade.net ([184.105.139.130]:47566 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751391AbdISWBr (ORCPT ); Tue, 19 Sep 2017 18:01:47 -0400 Date: Tue, 19 Sep 2017 15:01:46 -0700 (PDT) Message-Id: <20170919.150146.960352165896854483.davem@davemloft.net> To: arnd@arndb.de Cc: kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, edumazet@google.com, ncardwell@google.com, ycheng@google.com, soheil@google.com, fw@strlen.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] tcp: avoid bogus warning in tcp_clean_rtx_queue From: David Miller In-Reply-To: References: <20170918204855.170920-1-arnd@arndb.de> <20170919.140250.1393293793761020505.davem@davemloft.net> X-Mailer: Mew version 6.7 on Emacs 25.2 / 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]); Tue, 19 Sep 2017 15:01:47 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann Date: Tue, 19 Sep 2017 23:32:33 +0200 > On Tue, Sep 19, 2017 at 11:02 PM, David Miller wrote: >> What cpu did you test the object code generation upon and does that >> cpu have branch prediction hints in the target you are building for? > > This was a randconfig build targetting ARMv5. I'm pretty sure that has > no such hint instructions. I just tested on sparc64 and it changed the branch prediction: .L2157: - brz,pn %i3, .L1898 ! first_ackt, + brz,pt %i2, .L1898 ! first_ackt, mov -1, %o2 !, seq_rtt_us