Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx2.netapp.com ([216.240.18.37]:40268 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753920Ab2EFSYw (ORCPT ); Sun, 6 May 2012 14:24:52 -0400 From: "Myklebust, Trond" To: Daniel Pocock CC: "linux-nfs@vger.kernel.org" Subject: Re: extremely slow nfs when sync enabled Date: Sun, 6 May 2012 18:23:11 +0000 Message-ID: <1336328594.2593.14.camel@lade.trondhjem.org> References: <4FA5E950.5080304@pocock.com.au> In-Reply-To: <4FA5E950.5080304@pocock.com.au> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gU3VuLCAyMDEyLTA1LTA2IGF0IDAzOjAwICswMDAwLCBEYW5pZWwgUG9jb2NrIHdyb3RlOg0K PiANCj4gSSd2ZSBiZWVuIG9ic2VydmluZyBzb21lIHZlcnkgc2xvdyBuZnMgd3JpdGUgcGVyZm9y bWFuY2Ugd2hlbiB0aGUgc2VydmVyDQo+IGhhcyBgc3luYycgaW4gL2V0Yy9leHBvcnRzDQo+IA0K PiBJIHdhbnQgdG8gYXZvaWQgdXNpbmcgYXN5bmMsIGJ1dCBJIGhhdmUgdGVzdGVkIGl0IGFuZCBv biBteSBnaWdhYml0DQo+IG5ldHdvcmssIGl0IGdpdmVzIGFsbW9zdCB0aGUgc2FtZSBzcGVlZCBh cyBpZiBJIHdhcyBvbiB0aGUgc2VydmVyDQo+IGl0c2VsZi4gKGUuZy4gMzBNQi9zZWMgdG8gb25l IGRpc2ssIG9yIGxlc3MgdGhhbiAxTUIvc2VjIHRvIHRoZSBzYW1lDQo+IGRpc2sgb3ZlciBORlMg d2l0aCBgc3luYycpDQo+IA0KPiBJJ20gdXNpbmcgRGViaWFuIDYgd2l0aCAyLjYuMzgga2VybmVs cyBvbiBjbGllbnQgYW5kIHNlcnZlciwgTkZTdjMNCj4gDQo+IEkndmUgYWxzbyB0cmllZCBhIGNs aWVudCBydW5uaW5nIERlYmlhbiA3L0xpbnV4IDMuMi4wIHdpdGggYm90aCBORlN2Mw0KPiBhbmQg TkZTdjQsIHNwZWVkIGlzIHN0aWxsIHNsb3cNCj4gDQo+IExvb2tpbmcgYXQgaW9zdGF0IG9uIHRo ZSBzZXJ2ZXIsIEkgbm90aWNlIHRoYXQgYXZncnEtc3ogPSA4IHNlY3RvcnMNCj4gKDQwOTYgYnl0 ZXMpIHRocm91Z2hvdXQgdGhlIHdyaXRlIG9wZXJhdGlvbnMNCj4gDQo+IEkndmUgdHJpZWQgdmFy aW91cyB0ZXN0cywgZS5nLiBkZCBhIGxhcmdlIGZpbGUsIG9yIHVucGFjayBhIHRhcmJhbGwgd2l0 aA0KPiBtYW55IHNtYWxsIGZpbGVzLCB0aGUgaW9zdGF0IG91dHB1dCBpcyBhbHdheXMgdGhlIHNh bWUNCg0KV2VyZSB5b3UgdXNpbmcgJ2NvbnY9c3luYyc/DQoNCj4gTG9va2luZyBhdCAvcHJvYy9t b3VudHMgb24gdGhlIGNsaWVudHMsIGV2ZXJ5dGhpbmcgbG9va3MgZ29vZCwgbGFyZ2UNCj4gd3Np emUsIHRjcDoNCj4gDQo+IHJ3LHJlbGF0aW1lLHZlcnM9Myxyc2l6ZT0xMDQ4NTc2LHdzaXplPTEw NDg1NzYsbmFtbGVuPTI1NSxoYXJkLHByb3RvPXRjcCx0aW1lbz02MDAscmV0cmFucz0yLHNlYz1z eXMsbW91bnRhZGRyPTE5Mi54LngueCxtb3VudHZlcnM9Myxtb3VudHBvcnQ9NTg3MjcsbW91bnRw cm90bz11ZHAsbG9jYWxfbG9jaz1ub25lLGFkZHI9MTkyLngueC54DQo+IDAgMA0KPiANCj4gYW5k DQo+ICBydyxyZWxhdGltZSx2ZXJzPTQscnNpemU9MTA0ODU3Nix3c2l6ZT0xMDQ4NTc2LG5hbWxl bj0yNTUsaGFyZCxwcm90bz10Y3AscG9ydD0wLHRpbWVvPTYwMCxyZXRyYW5zPTIsc2VjPXN5cyxj bGllbnRhZGRyPTE5Mi54LngueC4sbWlub3J2ZXJzaW9uPTAsbG9jYWxfbG9jaz1ub25lLGFkZHI9 MTkyLngueC54IDAgMA0KPiANCj4gYW5kIGluIC9wcm9jL2ZzL25mcy9leHBvcnRzIG9uIHRoZSBz ZXJ2ZXIsIEkgaGF2ZSBzeW5jIGFuZCB3ZGVsYXk6DQo+IA0KPiAvbmZzNC9kYW5pZWwNCj4gMTky LjE2OC4xLjAvMjQsMTkyLngueC54KHJ3LGluc2VjdXJlLHJvb3Rfc3F1YXNoLHN5bmMsd2RlbGF5 LG5vX3N1YnRyZWVfY2hlY2ssdXVpZD1hYTJhNmYzNzo5Y2M5NGVlYjpiY2JmOTgzYzpkNmUwNDFk OSxzZWM9MSkNCj4gL2hvbWUvZGFuaWVsDQo+IDE5Mi4xNjguMS4wLzI0LDE5Mi54LngueChydyxy b290X3NxdWFzaCxzeW5jLHdkZWxheSxub19zdWJ0cmVlX2NoZWNrLHV1aWQ9YWEyYTZmMzc6OWNj OTRlZWI6YmNiZjk4M2M6ZDZlMDQxZDkpDQo+IA0KPiBDYW4gYW55b25lIHN1Z2dlc3QgYW55dGhp bmcgZWxzZT8gIE9yIGlzIHRoaXMgcmVhbGx5IHRoZSBwZXJmb3JtYW5jZSBoaXQNCj4gb2YgYHN5 bmMnPw0KDQpJdCByZWFsbHkgZGVwZW5kcyBvbiB5b3VyIGRpc2sgc2V0dXAuIFBhcnRpY3VsYXJs eSB3aGVuIHlvdXIgZmlsZXN5c3RlbQ0KaXMgdXNpbmcgYmFycmllcnMgKGVuYWJsZWQgYnkgZGVm YXVsdCBvbiBleHQ0IGFuZCB4ZnMpLCBhIGxvdCBvZiByYWlkDQpzZXR1cHMgcmVhbGx5IF9zdWNr XyBhdCBkZWFsaW5nIHdpdGggZnN5bmMoKS4gVGhlIGxhdHRlciBpcyB1c2VkIGV2ZXJ5DQp0aW1l IHRoZSBORlMgY2xpZW50IHNlbmRzIGEgQ09NTUlUIG9yIHRydW5jKCkgaW5zdHJ1Y3Rpb24sIGFu ZCBmb3INCnByZXR0eSBtdWNoIGFsbCBmaWxlIGFuZCBkaXJlY3RvcnkgY3JlYXRpb24gb3BlcmF0 aW9ucyAoeW91IGNhbiB1c2UNCiduZnNzdGF0JyB0byBtb25pdG9yIGhvdyBtYW55IHN1Y2ggb3Bl cmF0aW9ucyB0aGUgTkZTIGNsaWVudCBpcyBzZW5kaW5nDQphcyBwYXJ0IG9mIHlvdXIgdGVzdCku DQoNCkxvY2FsIGRpc2sgY2FuIGdldCBhd2F5IHdpdGggZG9pbmcgYSBsb3QgbGVzcyBmc3luYygp LCBiZWNhdXNlIHRoZSBjYWNoZQ0KY29uc2lzdGVuY3kgZ3VhcmFudGVlcyBhcmUgZGlmZmVyZW50 Og0KICAgICAgKiBpbiBORlMsIHRoZSBzZXJ2ZXIgaXMgYWxsb3dlZCB0byBjcmFzaCBvciByZWJv b3Qgd2l0aG91dA0KICAgICAgICBhZmZlY3RpbmcgdGhlIGNsaWVudCdzIHZpZXcgb2YgdGhlIGZp bGVzeXN0ZW0uDQogICAgICAqIGluIHRoZSBsb2NhbCBmaWxlIHN5c3RlbSwgdGhlIGV4cGVjdGF0 aW9uIGlzIHRoYXQgb24gcmVib290IGFueQ0KICAgICAgICBkYXRhIGxvc3QgaXMgd29uJ3QgbmVl ZCB0byBiZSByZWNvdmVyZWQgKHRoZSBhcHBsaWNhdGlvbiB3aWxsDQogICAgICAgIGhhdmUgdXNl ZCBmc3luYygpIGZvciBhbnkgZGF0YSB0aGF0IGRvZXMgbmVlZCB0byBiZSBwZXJzaXN0ZW50KS4N CiAgICAgICAgT25seSB0aGUgZGlzayBmaWxlc3lzdGVtIHN0cnVjdHVyZXMgbmVlZCB0byBiZSBy ZWNvdmVyZWQsIGFuZA0KICAgICAgICB0aGF0IGlzIGRvbmUgdXNpbmcgdGhlIGpvdXJuYWwgKG9y IGZzY2spLg0KDQoNCi0tIA0KVHJvbmQgTXlrbGVidXN0DQpMaW51eCBORlMgY2xpZW50IG1haW50 YWluZXINCg0KTmV0QXBwDQpUcm9uZC5NeWtsZWJ1c3RAbmV0YXBwLmNvbQ0Kd3d3Lm5ldGFwcC5j b20NCg0K