Return-Path: Received: from us-smtp-delivery-194.mimecast.com ([216.205.24.194]:53755 "EHLO us-smtp-delivery-194.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932177AbcLGPqh (ORCPT ); Wed, 7 Dec 2016 10:46:37 -0500 From: Trond Myklebust To: Benjamin Coddington CC: Linux NFS Mailing List Subject: Re: Concurrent `ls` takes out the thrash Date: Wed, 7 Dec 2016 15:46:32 +0000 Message-ID: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: DQo+IE9uIERlYyA3LCAyMDE2LCBhdCAwODoyOCwgQmVuamFtaW4gQ29kZGluZ3RvbiA8YmNvZGRp bmdAcmVkaGF0LmNvbT4gd3JvdGU6DQo+IA0KPiBJIHdhcyBhc2tlZCB0byBmaWd1cmUgb3V0IHdo eSB0aGUgbGlzdGluZyBvZiB2ZXJ5IGxhcmdlIGRpcmVjdG9yaWVzIHdhcw0KPiBzbG93LiAgTW9y ZSBzcGVjaWZpY2FsbHksIHdoeSBjb25jdXJyZW50bHkgbGlzdGluZyB0aGUgc2FtZSBsYXJnZSBk aXJlY3RvcnkNCj4gaXMgL3ZlcnkvIHNsb3cuICBJdCBzZWVtcyB0aGF0IHNvbWV0aW1lcyBhIHVz ZXIncyByZWFjdGlvbiB0byB3YWl0aW5nIGZvcg0KPiAnbHMnIHRvIGNvbXBsZXRlIGlzIHRvIHN0 YXJ0IGEgZmV3IG1vcmUuLiBhbmQgdGhlbiB0aGVpciBtYWNoaW5lIHRha2VzIGENCj4gdmVyeSBs b25nIHRpbWUgdG8gY29tcGxldGUgdGhhdCB3b3JrLg0KPiANCj4gSSBjYW4gcmVwcm9kdWNlIHRo YXQgZmluZGluZy4gIEFzIGFuIGV4YW1wbGU6DQo+IA0KPiB0aW1lIGxzIC1mbCAvZGlyL3dpdGgv MjAwMDAwL2VudHJpZXMvID4vZGV2L251bGwNCj4gDQo+IHJlYWwgICAgMG0xMC43NjZzDQo+IHVz ZXIgICAgMG0wLjcxNnMNCj4gc3lzICAgICAwbTAuODI3cw0KPiANCj4gQnV0Li4NCj4gDQo+IGZv ciBpIGluIHsxLi4xMH07IGRvIHRpbWUgbHMgLWZsIC9kaXIvd2l0aC8yMDAwMDAvZW50cmllcy8g Pi9kZXYvbnVsbCAmIGRvbmUNCj4gDQo+IEVhY2ggb2YgdGhlc2UgXl4gJ2xzJyBjb21tYW5kcyB3 aWxsIHRha2UgNCB0byA1IG1pbnV0ZXMgdG8gY29tcGxldGUuDQo+IA0KPiBUaGUgcHJvYmxlbSBp cyB0aGF0IGNvbmN1cnJlbnQgJ2xzJyBjb21tYW5kcyBzdGFjayB1cCBpbiBuZnNfcmVhZGRpcigp IGJvdGgNCj4gd2FpdGluZyBvbiB0aGUgbmV4dCBwYWdlIGFuZCB0YWtpbmcgdHVybnMgZmlsbGlu ZyB0aGUgbmV4dCBwYWdlIHdpdGggeGRyLA0KPiBidXQgb25seSBvbmUgb2YgdGhlbSB3aWxsIGhh dmUgZGVzYy0+cGx1cyBzZXQgYmVjYXVzZSBzZXR0aW5nIGl0IGNsZWFycyB0aGUNCj4gZmxhZyBv biB0aGUgZGlyZWN0b3J5LiAgU28gaWYgYSBwYWdlIGlzIGZpbGxlZCBieSBhIHByb2Nlc3MgdGhh dCBkb2Vzbid0IGhhdmUNCj4gZGVzYy0+cGx1cyB0aGVuIHRoZSBuZXh0IHBhc3MgdGhyb3VnaCBs b29rdXAoKSwgaXQgZHVtcHMgdGhlIGVudGlyZSBwYWdlDQo+IGNhY2hlIHdpdGggbmZzX2ZvcmNl X3VzZV9yZWFkZGlycGx1cygpLiAgVGhlbiB0aGUgbmV4dCByZWFkZGlyIHN0YXJ0cyBhbGwNCj4g b3ZlciBmaWxsaW5nIHRoZSBwYWdlY2FjaGUuICBGb3J3YXJkIHByb2dyZXNzIGhhcHBlbnMsIGJ1 dCBvbmx5IGFmdGVyIG1hbnkNCj4gc3RlcHMgYmFjayByZS1maWxsaW5nIHRoZSBwYWdlY2FjaGUu DQoNClllcywgdGhlIHJlYWRkaXIgY29kZSB3YXMgd3JpdHRlbiB3ZWxsIGJlZm9yZSBBbOKAmXMg cGF0Y2hlcyB0byBwYXJhbGxlbGlzZSB0aGUgVkZTIG9wZXJhdGlvbnMsIGFuZCBhIGxvdCBvZiBp dCBkaWQgcmVseSBvbiB0aGUgaW5vZGUtPmlfbXV0ZXggYmVpbmcgc2V0IG9uIHRoZSBkaXJlY3Rv cnkgYnkgdGhlIFZGUyBsYXllci4NCg0KSG93IGFib3V0IHRoZSBmb2xsb3dpbmcgc3VnZ2VzdGlv bjogaW5zdGVhZCBvZiBzZXR0aW5nIGEgZmxhZyBvbiB0aGUgaW5vZGUsIHdlIGl0ZXJhdGUgdGhy b3VnaCB0aGUgZW50cmllcyBpbiAmbmZzaS0+b3Blbl9maWxlcywgYW5kIHNldCBhIGZsYWcgb24g dGhlIHN0cnVjdCBuZnNfb3Blbl9kaXJfY29udGV4dCB0aGF0IHRoZSByZWFkZGlyIHByb2Nlc3Nl cyBjYW4gY29weSBpbnRvIGRlc2MtPnBsdXMuIERvZXMgdGhhdCBoZWxwIHdpdGggeW91ciB3b3Jr bG9hZD8NCg0K