Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 25 Oct 2002 02:43:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 25 Oct 2002 02:43:13 -0400 Received: from 167.imtp.Ilyichevsk.Odessa.UA ([195.66.192.167]:18183 "EHLO Port.imtp.ilyichevsk.odessa.ua") by vger.kernel.org with ESMTP id ; Fri, 25 Oct 2002 02:43:10 -0400 Message-Id: <200210250643.g9P6hop13980@Port.imtp.ilyichevsk.odessa.ua> From: Denis Vlasenko Reply-To: vda@port.imtp.ilyichevsk.odessa.ua To: Russell King , Roy Sigurd Karlsbakk , netdev@oss.sgi.com, Kernel mailing list Subject: Csum and csum copyroutines benchmark Date: Fri, 25 Oct 2002 09:36:22 -0200 X-Mailer: KMail [version 1.3.2] Cc: libc-alpha@sources.redhat.com References: <200210231218.18733.roy@karlsbakk.net> <20021024125030.A7529@flint.arm.linux.org.uk> <200210241249.g9OCnOp09750@Port.imtp.ilyichevsk.odessa.ua> In-Reply-To: <200210241249.g9OCnOp09750@Port.imtp.ilyichevsk.odessa.ua> MIME-Version: 1.0 Content-Type: Multipart/Mixed; boundary="------------Boundary-00=_M8CJKWOO7ADE2Z7MBTJ3" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15129 Lines: 226 --------------Boundary-00=_M8CJKWOO7ADE2Z7MBTJ3 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8bit /me said: > I'm experimenting with different csum_ routines in userspace now. Short conclusion: 1. It is possible to speed up csum routines for AMD processors by 30%. 2. It is possible to speed up csum_copy routines for both AMD and Intel three times or more. Roy, do you like that? ;) Tests: they checksum 4MB block and csum_copy 2MB into second 2MB. POISON=0/1 controls whether to perform correctness tests or not. That slows down test very noticeably. What does glibc use for memset/memcmp? for() loop?!! With POISON=1 ntqpf2_copy bugs out, see its source. I left it in to save repeating my work by others. BTW, i do NOT understand why it does not work. ;) Anyone with cluebat? IMHO the only way to make it optimal for all CPUs is to make these functions race at kernel init and pick the best one. tests on Celeron 1200 (100 MHz, x12 core) ========================================= Csum benchmark program buffer size: 4 Mb Each test tried 16 times, max and min CPU cycles are reported. Please disregard max values. They are due to system interference only. csum tests: kernel_csum - took 717 max, 704 min cycles per kb. sum=0x44000077 kernel_csum - took 4760 max, 704 min cycles per kb. sum=0x44000077 kernel_csum - took 722 max, 704 min cycles per kb. sum=0x44000077 kernelpii_csum - took 539 max, 528 min cycles per kb. sum=0x44000077 kernelpiipf_csum - took 573 max, 529 min cycles per kb. sum=0x44000077 pfm_csum - took 1411 max, 1306 min cycles per kb. sum=0x44000077 pfm2_csum - took 875 max, 762 min cycles per kb. sum=0x44000077 copy tests: kernel_copy - took 5738 max, 3423 min cycles per kb. sum=0x99aaaacc kernel_copy - took 3517 max, 3431 min cycles per kb. sum=0x99aaaacc kernel_copy - took 4385 max, 3432 min cycles per kb. sum=0x99aaaacc kernelpii_copy - took 2912 max, 2752 min cycles per kb. sum=0x99aaaacc ntqpf_copy - took 2010 max, 1700 min cycles per kb. sum=0x99aaaacc ntqpfm_copy - took 1749 max, 1701 min cycles per kb. sum=0x99aaaacc ntq_copy - took 2218 max, 2141 min cycles per kb. sum=0x99aaaacc BAD copy! <-- ntqpf2_copy is buggy :) see its source 'copy tests' above are with POISON=1 These are with POISON=0: kernel_copy - took 2009 max, 1935 min cycles per kb. sum=0x44000077 kernel_copy - took 2240 max, 1959 min cycles per kb. sum=0x44000077 kernel_copy - took 2197 max, 1936 min cycles per kb. sum=0x44000077 kernelpii_copy - took 2121 max, 1939 min cycles per kb. sum=0x44000077 ntqpf_copy - took 667 max, 548 min cycles per kb. sum=0x44000077 ntqpfm_copy - took 651 max, 546 min cycles per kb. sum=0x44000077 ntq_copy - took 660 max, 545 min cycles per kb. sum=0x44000077 ntqpf2_copy - took 644 max, 548 min cycles per kb. sum=0x44000077 Done Tests on Duron 650 (100 MHz, x6,5 core) ======================================= Csum benchmark program buffer size: 4 Mb Each test tried 16 times, max and min CPU cycles are reported. Please disregard max values. They are due to system interference only. csum tests: kernel_csum - took 1090 max, 1051 min cycles per kb. sum=0x44000077 kernel_csum - took 1080 max, 1052 min cycles per kb. sum=0x44000077 kernel_csum - took 1178 max, 1058 min cycles per kb. sum=0x44000077 kernelpii_csum - took 1614 max, 1052 min cycles per kb. sum=0x44000077 kernelpiipf_csum - took 976 max, 962 min cycles per kb. sum=0x44000077 pfm_csum - took 755 max, 746 min cycles per kb. sum=0x44000077 pfm2_csum - took 749 max, 745 min cycles per kb. sum=0x44000077 copy tests: kernel_copy - took 1251 max, 1072 min cycles per kb. sum=0x99aaaacc kernel_copy - took 1363 max, 1072 min cycles per kb. sum=0x99aaaacc kernel_copy - took 1352 max, 1072 min cycles per kb. sum=0x99aaaacc kernelpii_copy - took 1132 max, 1014 min cycles per kb. sum=0x99aaaacc ntqpf_copy - took 514 max, 480 min cycles per kb. sum=0x99aaaacc ntqpfm_copy - took 495 max, 482 min cycles per kb. sum=0x99aaaacc ntq_copy - took 1153 max, 948 min cycles per kb. sum=0x99aaaacc BAD copy! <-- ntqpf2_copy is buggy :) see its source 'copy tests' above are with POISON=1 These are with POISON=0: kernel_copy - took 1145 max, 871 min cycles per kb. sum=0x44000077 kernel_copy - took 879 max, 871 min cycles per kb. sum=0x44000077 kernel_copy - took 876 max, 871 min cycles per kb. sum=0x44000077 kernelpii_copy - took 1019 max, 845 min cycles per kb. sum=0x44000077 ntqpf_copy - took 2972 max, 229 min cycles per kb. sum=0x44000077 ntqpfm_copy - took 248 max, 245 min cycles per kb. sum=0x44000077 ntq_copy - took 460 max, 452 min cycles per kb. sum=0x44000077 ntqpf2_copy - took 390 max, 340 min cycles per kb. sum=0x44000077 Done -- vda --------------Boundary-00=_M8CJKWOO7ADE2Z7MBTJ3 Content-Type: application/x-bzip2; name="timing_csum_copy.tar.bz2" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="timing_csum_copy.tar.bz2" QlpoOTFBWSZTWbxlnuQAOIl/vPu3PcB////////f//////8AEAIBAAFQAoUIYCK++faaUEABqQtW 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