From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Sangtae Ha" Subject: Re: A Linux TCP SACK Question Date: Sat, 5 Apr 2008 17:17:45 -0400 Message-ID: <649aecc70804051417l4cf9b30asec8ca8d55e79e051@mail.gmail.com> References: <1e41a3230804040927j3ce53a84u6a95ec37dff1b5b0@mail.gmail.com> <000001c8967c$496efa20$c95ee183@D2GT6T71> <000b01c89699$00e99590$c95ee183@D2GT6T71> <000f01c896a1$3022fec0$c95ee183@D2GT6T71> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_11764_14107941.1207430265267" Cc: "=?ISO-8859-1?Q?Ilpo_J=E4rvinen?=" , "John Heffner" , Netdev To: wenji@fnal.gov Return-path: Received: from yw-out-2324.google.com ([74.125.46.29]:46005 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753674AbYDEVRq (ORCPT ); Sat, 5 Apr 2008 17:17:46 -0400 Received: by yw-out-2324.google.com with SMTP id 5so124295ywb.1 for ; Sat, 05 Apr 2008 14:17:45 -0700 (PDT) In-Reply-To: <000f01c896a1$3022fec0$c95ee183@D2GT6T71> Sender: netdev-owner@vger.kernel.org List-ID: ------=_Part_11764_14107941.1207430265267 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Can you run the attached script and run your testing again? I think it might be the problem of your dual cores balance the interrupts on your testing NIC. As we do a lot of things with SACK, cache misses and etc. might affect your performance. In default setting, I disabled tcp segment offload and did a smp affinity setting to CPU 0. Please change "INF" to your interface name and let us know the results. Sangtae On Fri, Apr 4, 2008 at 6:14 PM, Wenji Wu wrote: > > >...Assuming it wasn't disabled already. If you find that there's > >significant difference, you could try also with SACK+basic FRTO (set > >the tcp_frto sysctl to 1). > > No, still the same. I tried tcp_frto with 0, 1, 2. > > SACK On is worse than SACK off. > > wenji > > > -- > > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > ------=_Part_11764_14107941.1207430265267 Content-Type: application/x-sh; name=tuning.sh Content-Transfer-Encoding: base64 X-Attachment-Id: f_feooricd0 Content-Disposition: attachment; filename=tuning.sh IyEvYmluL3NoCgojIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjCiMgU2FuZ3RhZSBIYSAKIyA8c2Fu Z3RhZS5oYUBnbWFpbC5jb20+CiMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMKCiMjIyMjIyMjIyMj IyMjIyMjIyMjIyMjIyMKIyBJbnRlcmZhY2UKIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIwpJTkY9 ZXRoMwoKIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIwojIE1heGltdW0gQnVmZmVyCiMjIyMjIyMj IyMjIyMjIyMjIyMjIyMjIyMKTUFYQlVGX09OPTAKTUFYQlVGPTEzNDIxNzcyOCAjIE1heGltdW0g VENQIGJ1ZmZlciBzaXplICgxMjhNQikKCiMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMKIyBNYXhp bXVtIEJhY2tsb2cgCiMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMKTUFYQkFDS0xPR19PTj0wCk1B WEJBQ0tMT0c9MzAwMCAjIE1heGltdW0gYmFja2xvZwoKIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMj IwojIEludGVyZmFjZSBSaW5nIFBhcmFtcyAKIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIwpSSU5H X09OPTAKVFhfUklORz00MDk2ICMgVFggcmluZyBidWZmZXIgc2l6ZQpSWF9SSU5HPTQwOTYgIyBS WCByaW5nIGJ1ZmZlciBzaXplCgojIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjCiMgVFNPIChUQ1Ag U2VnbWVudCBPZmZsb2FkKSAKIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIwpUU09fT049MQpUU089 b2ZmICMgVFNPKFRDUCBTZWdtZW50IE9mZmxvYWQpIG9mZi9vbgoKIyMjIyMjIyMjIyMjIyMjIyMj IyMjIyMjIwojIFNNUCBhZmZpbml0eSAgCiMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMKU01QX0FG RklOSVRZPTEKSU5UPWBjYXQgL3Byb2MvaW50ZXJydXB0cyB8IGdyZXAgJElORiB8IGN1dCAtZCA6 IC1mIDFgCkNQVT0xICMgcm91dGUgdGhlIHR4L3J4IGludGVycnVwdHMgdG8gMXN0IENQVQogICAg ICAjIHRoZSBudW1iZXIgaXMgMl4obi0xKSBmb3IgdGhlICduJ3N0IENQVSAKCiMgd2Ugb25seSB0 b3VjaCB0aGUgbWF4aW11bSBUQ1AgYnVmZmVyIHNpemUsCiMgc28gbm9ybWFsIHVzZXJzIHdpbGwg YmUgb2sgZm9yIHRoaXMgY2hhbmdlCmlmIFsgJE1BWEJVRl9PTiAtZXEgMSBdOyB0aGVuCi9zYmlu L3N5c2N0bCAtdyBuZXQuY29yZS5ybWVtX21heD0kTUFYQlVGCi9zYmluL3N5c2N0bCAtdyBuZXQu Y29yZS53bWVtX21heD0kTUFYQlVGCi9zYmluL3N5c2N0bCAtdyBuZXQuaXB2NC50Y3Bfcm1lbT0i NDA5NiA4NzM4MCAkTUFYQlVGIgovc2Jpbi9zeXNjdGwgLXcgbmV0LmlwdjQudGNwX3dtZW09IjQw OTYgNjU1MzYgJE1BWEJVRiIKL3NiaW4vc3lzY3RsIC13IG5ldC5pcHY0LnRjcF9ub19tZXRyaWNz X3NhdmU9MQpmaQoKIyBtYXggYmFja2xvZwppZiBbICRNQVhCQUNLTE9HX09OIC1lcSAxIF07IHRo ZW4KL3NiaW4vc3lzY3RsIC13IG5ldC5jb3JlLm5ldGRldl9tYXhfYmFja2xvZz0kTUFYQkFDS0xP RwpmaQoKIyByeCBhbmQgdHggcmluZyBidWZmZXIgc2l6ZQppZiBbICRSSU5HX09OIC1lcSAxIF07 IHRoZW4KL3Vzci9zYmluL2V0aHRvb2wgLUcgJElORiByeCAkUlhfUklORwovdXNyL3NiaW4vZXRo dG9vbCAtRyAkSU5GIHR4ICRUWF9SSU5HCmZpCgojIHRzbyBvbi9vZmYKaWYgWyAkVFNPX09OIC1l cSAxIF07IHRoZW4KL3Vzci9zYmluL2V0aHRvb2wgLUsgJElORiB0c28gJFRTTwpmaQoKIyBTTVAg YWZmaW5pdHkgc2V0dGluZwppZiBbICRTTVBfQUZGSU5JVFkgLWVxIDEgXTsgdGhlbgplY2hvICRD UFUgPiAvcHJvYy9pcnEvYGV4cHIgJElOVGAvc21wX2FmZmluaXR5CmZpCg== ------=_Part_11764_14107941.1207430265267--