Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx2.netapp.com ([216.240.18.37]:35046 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756043Ab2CWMQp (ORCPT ); Fri, 23 Mar 2012 08:16:45 -0400 From: "Myklebust, Trond" To: Jim Rees CC: Vivek Trivedi , "linux-nfs@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Namjae Jeon , "amit.sahrawat83@gmail.com" Subject: Re: NFS: low read/stat performance on small files Date: Fri, 23 Mar 2012 12:16:40 +0000 Message-ID: <1332505002.20500.14.camel@lade.trondhjem.org> References: <20120323114913.GB24489@umich.edu> In-Reply-To: <20120323114913.GB24489@umich.edu> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gRnJpLCAyMDEyLTAzLTIzIGF0IDA3OjQ5IC0wNDAwLCBKaW0gUmVlcyB3cm90ZToNCj4gVml2 ZWsgVHJpdmVkaSB3cm90ZToNCj4gDQo+ICAgMjA0ODAwIGJ5dGVzICgyMDAuMEtCKSBjb3BpZWQs IDAuMDI3MDc0IHNlY29uZHMsIDcuMk1CL3MNCj4gICBSZWFkIHNwZWVkIGZvciAyMDBLQiBmaWxl IGlzIDcuMiBNQg0KPiANCj4gICAxMDQ4NTc2MDAgYnl0ZXMgKDEwMC4wTUIpIGNvcGllZCwgOS4z NTEyMjEgc2Vjb25kcywgMTAuN01CL3MNCj4gICBSZWFkIHNwZWVkIGZvciAxMDBNQiBmaWxlIGlz IDEwLjcgTUINCj4gICANCj4gICBBcyB5b3Ugc2VlIHJlYWQgc3BlZWQgZm9yIDIwMEtCIGZpbGUg aXMgb25seSA3LjJNQi9zZWMgd2hpbGUgaXQgaXMNCj4gICAxMC43IE1CL3NlYyB3aGVuIHdlIHJl YWQgMTAwTUIgZmlsZS4NCj4gICBXaHkgdGhlcmUgaXMgc28gbXVjaCBkaWZmZXJlbmNlIGluIHJl YWQgcGVyZm9ybWFuY2UgPw0KPiAgIElzIHRoZXJlIGFueSB3YXkgdG8gYWNoaWV2ZSBoaWdoIHJl YWQgc3BlZWQgZm9yIHNtYWxsIGZpbGVzID8NCj4gDQo+IFRoYXQgc2VlbXMgZXhjZWxsZW50IHRv IG1lLiAgMjA0ODAwIGJ5dGVzIGF0IDExMjEzMjUyIHBlciBzZWMgd291bGQgYmUgMTguMg0KPiBt c2VjLCBzbyB5b3VyIHBlci1maWxlIG92ZXJoZWFkIGlzIGFyb3VuZCA5IG1zZWMuICBUaGUgZGlz ayBsYXRlbmN5IGFsb25lDQo+IHdvdWxkIG5vcm1hbGx5IGJlIG1vcmUgdGhhbiB0aGF0Lg0KDQou Li5hbmQgdGhlIHJlYXNvbiB3aHkgdGhlIHBlcmZvcm1hbmNlIGlzIHdvcnNlIGZvciB0aGUgMjAw SyBmaWxlDQpjb21wYXJlZCB0byB0aGUgMTAwTSBvbmUgaXMgZWFzaWx5IGV4cGxhaW5lZC4NCg0K V2hlbiBvcGVuaW5nIHRoZSBmaWxlIGZvciByZWFkaW5nLCB0aGUgY2xpZW50IGhhcyBhIG51bWJl ciBvZg0Kc3luY2hyb25vdXMgUlBDIGNhbGxzIHRvIG1ha2U6IGl0IG5lZWRzIHRvIGxvb2sgdXAg dGhlIGZpbGUsIGNoZWNrDQphY2Nlc3MgcGVybWlzc2lvbnMgYW5kIHBvc3NpYmx5IHJldmFsaWRh dGUgaXRzIGNhY2hlLiBBbGwgdGhlc2UgdGFza3MNCmhhdmUgdG8gYmUgZG9uZSBpbiBzZXJpZXMg KHlvdSBjYW5ub3QgZG8gdGhlbSBpbiBwYXJhbGxlbCksIGFuZCBzbyB0aGUNCmxhdGVuY3kgb2Yg ZWFjaCB0YXNrIGlzIGxpbWl0ZWQgYnkgdGhlIHJvdW5kLXRyaXAgdGltZSB0byB0aGUgc2VydmVy Lg0KDQpPbiB0aGUgb3RoZXIgaGFuZCwgb25jZSB5b3UgZ2V0IHRvIGRvaW5nIFJFQURzLCB0aGUg Y2xpZW50IGNhbiBzZW5kIGENCmJ1bmNoIG9mIHJlYWRhaGVhZCByZXF1ZXN0cyBpbiBwYXJhbGxl bCwgdGh1cyBlbnN1cmluZyB0aGF0IHRoZSBzZXJ2ZXINCmNhbiB1c2UgYWxsIHRoZSBiYW5kd2lk dGggYXZhaWxhYmxlIHRvIHRoZSBUQ1AgY29ubmVjdGlvbi4NCg0KU28geW91ciByZXN1bHQgaXMg YmFzaWNhbGx5IHNob3dpbmcgdGhhdCBmb3Igc21hbGwgZmlsZXMsIHRoZSBwcm9wb3J0aW9uDQpv ZiAocmVhZGFoZWFkKSB0YXNrcyB0aGF0IGNhbiBiZSBkb25lIGluIHBhcmFsbGVsIGlzIHNtYWxs ZXIuIFRoaXMgaXMgYXMNCmV4cGVjdGVkLg0KDQotLSANClRyb25kIE15a2xlYnVzdA0KTGludXgg TkZTIGNsaWVudCBtYWludGFpbmVyDQoNCk5ldEFwcA0KVHJvbmQuTXlrbGVidXN0QG5ldGFwcC5j b20NCnd3dy5uZXRhcHAuY29tDQoNCg==