From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752252AbbJENrm (ORCPT ); Mon, 5 Oct 2015 09:47:42 -0400 Received: from shards.monkeyblade.net ([149.20.54.216]:40231 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751104AbbJENrk (ORCPT ); Mon, 5 Oct 2015 09:47:40 -0400 Date: Mon, 05 Oct 2015 07:03:14 -0700 (PDT) Message-Id: <20151005.070314.997252169637059167.davem@davemloft.net> To: nschichan@freebox.fr Cc: linux@arm.linux.org.uk, mgherzan@gmail.com, daniel@iogearbox.net, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. From: David Miller In-Reply-To: <1443798407-19154-1-git-send-email-nschichan@freebox.fr> References: <1443798407-19154-1-git-send-email-nschichan@freebox.fr> X-Mailer: Mew version 6.4 on Emacs 23.4 / 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, 05 Oct 2015 06:47:40 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicolas Schichan Date: Fri, 2 Oct 2015 17:06:47 +0200 > For ARMv7 with UDIV instruction support, generate an UDIV instruction > followed by an MLS instruction. > > For other ARM variants, generate code calling a C wrapper similar to > the jit_udiv() function used for BPF_ALU | BPF_DIV instructions. > > Some performance numbers reported by the test_bpf module (the duration > per filter run is reported in nanoseconds, between "jitted:" and > "PASS": > > ARMv7 QEMU nojit: test_bpf: #3 DIV_MOD_KX jited:0 2196 PASS > ARMv7 QEMU jit: test_bpf: #3 DIV_MOD_KX jited:1 104 PASS > ARMv5 QEMU nojit: test_bpf: #3 DIV_MOD_KX jited:0 2176 PASS > ARMv5 QEMU jit: test_bpf: #3 DIV_MOD_KX jited:1 1104 PASS > ARMv5 kirkwood nojit: test_bpf: #3 DIV_MOD_KX jited:0 1103 PASS > ARMv5 kirkwood jit: test_bpf: #3 DIV_MOD_KX jited:1 311 PASS > > Signed-off-by: Nicolas Schichan Applied, thanks.