From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: TCP rx window autotuning harmful at LAN context Date: Wed, 11 Mar 2009 01:41:03 -0700 (PDT) Message-ID: <20090311.014103.163410266.davem@davemloft.net> References: <20090310160040.GA93054@bts.sk> <20090310.091816.178102814.davem@davemloft.net> <20090311082920.GA20543@bts.sk> Mime-Version: 1.0 Content-Type: Text/Plain; charset=utf-8 Content-Transfer-Encoding: base64 Cc: johnwheffner@gmail.com, netdev@vger.kernel.org To: md@bts.sk Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:57027 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751077AbZCKIlR (ORCPT ); Wed, 11 Mar 2009 04:41:17 -0400 In-Reply-To: <20090311082920.GA20543@bts.sk> Sender: netdev-owner@vger.kernel.org List-ID: RnJvbTogTWFyaWFuIMSOdXJrb3ZpxI0gPG1kQGJ0cy5zaz4NCkRhdGU6IFdlZCwgMTEgTWFyIDIw MDkgMDk6Mjk6MjAgKzAxMDANCg0KPiBGb3IgdGhlIGxhc3QgdGltZToNCg0KVGhhbmtmdWxseS4u Lg0KDQo+IHNldHRpbmcgVENQIHdpbmRvdyB0byBCRFAgaXMgd2VsbC1rbm93biBhbmQgZ2VuZXJh bGx5IGFjY2VwdGVkDQo+IHByYWN0aWNlLiBBdXRvdHVuaW5nIGRvZXMgTk9UIHJlc3BlY3QgaXQs IGFuZCBmb3IgMTAwIE1wYnMNCj4gY29ubmVjdGlvbnMgYXQgTEFOIGNvbnRleHQgaXQgbWlnaHQg c2V0IHRoZSByeCB3aW5kb3cgc29tZXdoZXJlDQo+IGJldHdlZW4gMTAwKkJEUCBhbmQgMzAwKkJE UC4gU2luY2UgdGhlIEJEUCBmb3JtdWxhIG9idmlvdXNseSBhcHBsaWVzDQo+IGFsc28gaW4gcmV2 ZXJzZSBkaXJlY3Rpb24sIGkuZS4NCg0KSXQncyB0aGUgY29uZ2VzdGlvbiBjb250cm9sIGFsZ29y aXRobSBvbiB0aGUgc2VuZGVyIG1ha2luZyB0aGlzDQpoYXBwZW4sIG5vdCB3aW5kb3cgYXV0b3Np emluZy4gIFRoZSB3aW5kb3cgYXV0b3NpemluZyBpcyBvbmx5DQpwcm92aWRpbmcgZm9yIGZsb3cg Y29udHJvbC4gIEl0J3MgdGhlIGNvbmdlc3Rpb24gY29udHJvbCBhbGdvcml0aG0NCnRoYXQgaXMg ZGVjaWRpbmcgdG8gc2VuZCBtb3JlIGFuZCBtb3JlIGludG8gYSBwYXRoIHdoZXJlIG9ubHkNCmxh dGVuY3kgKGFuZCBub3QgYmFuZHdpZHRoKSBpcyBpbmNyZWFzaW5nIHdpdGggbGFyZ2VyIGNvbmdl c3Rpb24NCndpbmRvdyB2YWx1ZXMuDQoNCkpvaG4gaGFzIHRyaWVkIHRvIGV4cGxhaW4gdGhpcyB0 byB5b3UsIGFuZCBub3cgSSBoYXZlIGFsc28gbWFkZSBhbg0KZWZmb3J0LiAgU28gcGxlYXNlIHN0 b3AgaWdub3Jpbmcgd2hhdCB0aGUgcmVhbCBpc3N1ZSBpcyBoZXJlLg0KDQpZb3UgYWxzbyBjb3Vs ZCB1c2UgQWN0aXZlIFF1ZXVlIE1hbmFnZW1lbnQuICBCdXQgSSBkb3VidCB5b3Ugd291bGQNCmJv dGhlciBldmVuIHRlc3Rpbmcgc3VjaCBhIHRoaW5nIHRvIGxldCB1cyBrbm93IGhvdyB3ZWxsIHRo YXQgd29ya3MgaW4NCnlvdXIgc2l0dWF0aW9uLiAgWW91J3ZlIGFscmVhZHkgZGVjaWRlZCBob3cg eW91IGFyZSB3aWxsaW5nIHRvIGhhbmRsZQ0KdGhpcyBpc3N1ZSwgc28gaXQncyBhIGZhaXQgYWNj b21wbGkuDQoNCkl0J3Mgc2VlbXMgdG8gYmUgbm90IGV2ZW4gYSBtYXR0ZXIgZm9yIGRpc2N1c3Np b24gZm9yIHlvdSwgc28gdGhhdCdzDQp3aHkgdGhpcyB0aHJlYWQgd2lsbCBsaWtlbHkgZ28gbm93 aGVyZSBpZiBpdCdzIGVudGlyZWx5IHVwIHRvIHlvdS4NCg0KPiBkZWxheT13aW5kb3cvYmFuZHdp dGgNCj4gDQo+IHNldHRpbmcgaW5zYW5lbHkgaHVnZSB3aW5kb3cgcmVzdWx0cyBpbiBpbnNhbmVs eSBpbmNyZWFzZWQgTEFOIGxhdGVuY2llcw0KPiAodXB0byBidWZmZXIgbGltaXRzKS4gSXMgdGhp cyByZWFsbHkgc29tZXRoaW5nIG5vb25lIGNhcmVzIGFib3V0ID8hIA0KDQpMZXQgbWUgY2x1ZSB5 b3UgaW4gYWJvdXQgc29tZXRoaW5nIHlvdSBtYXkgbm90IGJlIGF3YXJlIG9mLg0KDQpJZiB5b3Ug ZG9uJ3QgYXV0by10dW5lIGFuZCBsZXQgdGhlIFJYIHNvY2tldCBidWZmZXIgaW5jcmVhc2UgdXAN CnRvIGEgZmV3IG1lZ2FieXRlcywgeW91IGNhbm5vdCBmdWxseSB1dGlsaXplIHRoZSBsaW5rIG9u IHJlYWwNCnRyYW5zLWNvbnRpbmVudGFsIGNvbm5lY3Rpb25zIHBlb3BsZSBhcmUgdXNpbmcgb3Zl ciB0aGUgaW50ZXJuZXQNCnRvZGF5Lg0KDQpTbyB5b3VyIHN1Z2dlc3Rpb24gd291bGQgYmUgYSBo dWdlIHN0ZXAgYmFja3dhcmRzLg0KDQpUaGlzIGlzIHdoeSB5b3Uga2VlcCBiZWluZyB0b2xkIHRo YXQgd2hhdCB5b3UncmUgYXNraW5nIHVzIHRvIGRvDQppcyBub3QgYXBwcm9wcmlhdGUuDQoNCllv dSBjYW4ndCBldmVuIHRhbGsgMTAwTWJpdCBiZXR3ZWVuIE5ldyBZb3JrIGFuZCBTYW4gRnJhbmNp c2NvDQp3aXRob3V0IGFwcHJvcHJpYXRlbHkgc2l6ZWQgbGFyZ2UgUlggYnVmZmVycywgYW5kIFJY IGF1dG90dW5pbmcNCmlzIHRoZSBvbmx5IHdheSB0byBhY2hpZXZlIHRoYXQgbm93Lg0KDQpTaW1p bGFybHkgZm9yIHdlc3QgY29hc3QgVVMgdG8gYW55d2hlcmUgaW4gdGhlIEFzaWEgUGFjaWZpYyBy ZWdpb24uDQoNClNvIHRoZSB3b3JsZCBpcyBtdWNoIGJpZ2dlciB0aGFuIHlvdXIgbGl0dGxlIHVu aXZlcnNpdHkgd2hlcmUgeW91J3ZlDQpkZWNpZGVkIHRvIG92ZXJzdWJzY3JpYmUgeW91ciBuZXR3 b3JrLCBhbmQgdGhlcmUgYXJlIG1hbnkgb3RoZXIgaXNzdWVzDQp0byBjb25zaWRlciBiZXNpZGVz IHlvdXIgc3BlY2lmaWMgbG9jYWxpemVkIHByb2JsZW0uDQo=