[{"id":1761544,"web_url":"http://patchwork.ozlabs.org/comment/1761544/","msgid":"<59A9282F.5080906@iogearbox.net>","list_archive_url":null,"date":"2017-09-01T09:28:15","subject":"Re: [PATCH net-next 3/3] bpf: Only set node->ref = 1 if it has not\n\tbeen set","submitter":{"id":65705,"url":"http://patchwork.ozlabs.org/api/people/65705/","name":"Daniel Borkmann","email":"daniel@iogearbox.net"},"content":"On 09/01/2017 08:27 AM, Martin KaFai Lau wrote:\n> This patch writes 'node->ref = 1' only if node->ref is 0.\n> The number of lookups/s for a ~1M entries LRU map increased by\n> ~30% (260097 to 343313).\n>\n> Other writes on 'node->ref = 0' is not changed. In those cases, the\n> same cache line has to be changed anyway.\n>\n> First column: Size of the LRU hash\n> Second column: Number of lookups/s\n>\n> Before:\n>> echo \"$((2**20+1)): $(./map_perf_test 1024 1 $((2**20+1)) 10000000 | awk '{print $3}')\"\n> 1048577: 260097\n>\n> After:\n>> echo \"$((2**20+1)): $(./map_perf_test 1024 1 $((2**20+1)) 10000000 | awk '{print $3}')\"\n> 1048577: 343313\n>\n> Signed-off-by: Martin KaFai Lau \n\nAcked-by: Daniel Borkmann ","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":"ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=)","Received":["from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xkDSN59Hgz9t2x\n\tfor ;\n\tFri, 1 Sep 2017 19:28:20 +1000 (AEST)","(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751803AbdIAJ2S (ORCPT );\n\tFri, 1 Sep 2017 05:28:18 -0400","from www62.your-server.de ([213.133.104.62]:41208 \"EHLO\n\twww62.your-server.de\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751755AbdIAJ2Q (ORCPT\n\t); Fri, 1 Sep 2017 05:28:16 -0400","from [92.105.166.74] (helo=localhost.localdomain)\n\tby www62.your-server.de with esmtpsa (TLSv1.2:DHE-RSA-AES256-SHA:256)\n\t(Exim 4.85_2) (envelope-from )\n\tid 1dniFL-0000D9-E4; Fri, 01 Sep 2017 11:28:15 +0200"],"Message-ID":"<59A9282F.5080906@iogearbox.net>","Date":"Fri, 01 Sep 2017 11:28:15 +0200","From":"Daniel Borkmann ","User-Agent":"Mozilla/5.0 (X11; Linux x86_64;\n\trv:31.0) Gecko/20100101 Thunderbird/31.7.0","MIME-Version":"1.0","To":"Martin KaFai Lau , netdev@vger.kernel.org","CC":"Alexei Starovoitov , kernel-team@fb.com","Subject":"Re: [PATCH net-next 3/3] bpf: Only set node->ref = 1 if it has not\n\tbeen set","References":"<20170901062713.1842249-1-kafai@fb.com>\n\t<20170901062713.1842249-4-kafai@fb.com>","In-Reply-To":"<20170901062713.1842249-4-kafai@fb.com>","Content-Type":"text/plain; charset=windows-1252; format=flowed","Content-Transfer-Encoding":"7bit","X-Authenticated-Sender":"daniel@iogearbox.net","X-Virus-Scanned":"Clear (ClamAV 0.99.2/23750/Fri Sep 1 06:39:59 2017)","Sender":"netdev-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"netdev@vger.kernel.org"}},{"id":1761724,"web_url":"http://patchwork.ozlabs.org/comment/1761724/","msgid":"<376e7393-143b-aca6-4cb5-0d8987bbe8b3@fb.com>","list_archive_url":null,"date":"2017-09-01T14:22:52","subject":"Re: [PATCH net-next 3/3] bpf: Only set node->ref = 1 if it has not\n\tbeen set","submitter":{"id":68234,"url":"http://patchwork.ozlabs.org/api/people/68234/","name":"Alexei Starovoitov","email":"ast@fb.com"},"content":"On 8/31/17 11:27 PM, Martin KaFai Lau wrote:\n> This patch writes 'node->ref = 1' only if node->ref is 0.\n> The number of lookups/s for a ~1M entries LRU map increased by\n> ~30% (260097 to 343313).\n>\n> Other writes on 'node->ref = 0' is not changed. In those cases, the\n> same cache line has to be changed anyway.\n>\n> First column: Size of the LRU hash\n> Second column: Number of lookups/s\n>\n> Before:\n>> echo \"$((2**20+1)): $(./map_perf_test 1024 1 $((2**20+1)) 10000000 | awk '{print $3}')\"\n> 1048577: 260097\n>\n> After:\n>> echo \"$((2**20+1)): $(./map_perf_test 1024 1 $((2**20+1)) 10000000 | awk '{print $3}')\"\n> 1048577: 343313\n>\n> Signed-off-by: Martin KaFai Lau \n\nAcked-by: Alexei Starovoitov ","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=fb.com header.i=@fb.com header.b=\"MpZHGaw0\";\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=fb.onmicrosoft.com header.i=@fb.onmicrosoft.com\n\theader.b=\"ISnOeqg8\"; 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Fri, 1 Sep 2017 07:22:54 -0700","from [IPv6:2620:10d:c082:1055:e425:8a81:8696:617]\n\t(2620:10d:c090:200::4:1c67) by\n\tBL2PR15MB0961.namprd15.prod.outlook.com\n\t(2603:10b6:201:15::23) with Microsoft SMTP Server (version=TLS1_2,\n\tcipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.20.13.10;\n\tFri, 1 Sep 2017 14:22:52 +0000"],"DKIM-Signature":["v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com;\n\th=subject : to : references\n\t: cc : from : message-id : date : mime-version : in-reply-to :\n\tcontent-type : content-transfer-encoding; s=facebook;\n\tbh=kOZ6IOJNAOefpdRZVyaMXQhX5cAk8dJM4lHCqCnlG+Q=;\n\tb=MpZHGaw0B1UpH6e0WEOHaR63naFH5RO1qFRt2D7YhJzQ0GBYr4t2yPg+EnKS2Rbc+1uy\n\tbq3vMaXV0p7K1Mw7t+JctsZLg3DHIdiT1ZNcY2GoHREe98qN4NWFZW2a+toF4iqawsV1\n\tdXb91c9llNgoF4l2UHGkqyHKu+Q4BRYxK+k= ","v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.onmicrosoft.com; \n\ts=selector1-fb-com;\n\th=From:Date:Subject:Message-ID:Content-Type:MIME-Version; \n\tbh=kOZ6IOJNAOefpdRZVyaMXQhX5cAk8dJM4lHCqCnlG+Q=;\n\tb=ISnOeqg8WIalvMoVzWqtx0Q6HJOI8LzuoVRn1t9OiSt+cshohRGApF460s03LJevQE3rAdosg8z7KR/SziRywtPbUP24n803aBO42S7ADqB8xRna/BvKR2qkhEqu0XmyjR7JCUTZHDaJiCp5fs6QjvNigN5wpZtaJ5JL1lnsRAg="],"Subject":"Re: [PATCH net-next 3/3] bpf: Only set node->ref = 1 if it has not\n\tbeen set","To":"Martin KaFai Lau , ","References":"<20170901062713.1842249-1-kafai@fb.com>\n\t<20170901062713.1842249-4-kafai@fb.com>","CC":"Daniel Borkmann , ","From":"Alexei Starovoitov ","Message-ID":"<376e7393-143b-aca6-4cb5-0d8987bbe8b3@fb.com>","Date":"Fri, 1 Sep 2017 07:22:52 -0700","User-Agent":"Mozilla/5.0 (Macintosh; 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