From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: 40% performance loss with multipath since kernel 3.12 Date: Thu, 25 Jun 2015 12:15:48 -0400 Message-ID: <20150625161548.GA8924@redhat.com> References: <81E477AB-B572-4EEA-97E8-79E370B6D23A@gmail.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <81E477AB-B572-4EEA-97E8-79E370B6D23A@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Derick Swanepoel Cc: dm-devel@redhat.com List-Id: dm-devel.ids T24gVGh1LCBKdW4gMjUgMjAxNSBhdCAxMjowN3BtIC0wNDAwLApEZXJpY2sgU3dhbmVwb2VsIDxk c3dhbmVwb2VsQGdtYWlsLmNvbT4gd3JvdGU6Cgo+IEhpCj4gCj4gV2UgaGF2ZSBhbiBpU0NTSS1i YXNlZCBTQU4gdGhhdCB1c2VzIGRtLW11bHRpcGF0aCB0byBhZ2dyZWdhdGUgdHdvIDEwIEdiIGxp bmtzIGluIG11bHRpYnVzIG1vZGUuIFdpdGgga2VybmVsIDMuMTEuNiB3ZSBnb3QgdmVyeSBnb29k IHBlcmZvcm1hbmNlLCBhY2hpZXZpbmcgdXAgdG8gMTU1MCBNQi9zIHJlYWQgb24gdGhlIG11bHRp cGF0aCBkZXZpY2UuCj4gCj4gQWZ0ZXIgdXBncmFkaW5nIHRvIGtlcm5lbCA0LjAuNSwgcGVyZm9y bWFuY2UgaGFzIGRyb3BwZWQgYnkgNDAlLiBSZWFkIHNwZWVkIGlzIG5vdyBsaW1pdGVkIHRvIDk2 MCBNQi9zLCB3aGljaCBpcyBzbG93ZXIgdGhhbiB0aGUgOTc1IE1CL3MgdGhhdCB0aGUgaW5kaXZp ZHVhbCBwYXRocyBjYW4gYWNoaWV2ZS4KPiAKPiBXZSBkaWQgYSBsb3Qgb2YgdGVzdGluZyBvbiAz LjExLjYgdG8gZmluZCBhbiBvcHRpbWFsIHJyX21pbl9pb19ycSB2YWx1ZSBhbmQgc2V0dGxlZCBv biA5IHVzaW5nIHRoZSByb3VuZC1yb2JpbiBwYXRoIHNlbGVjdG9yLiBXaXRoIDQuMC41LCB3ZeKA mXZlIHRyaWVkIGFsbCB0aGUgcGF0aCBzZWxlY3RvcnMgd2l0aCBycl9taW5faW9fcnEgZnJvbSAx IHRvIDEwMCwgYnV0IGNhbuKAmXQgc2VlbSB0byBiZWF0IHRoZSBwZXJmb3JtYW5jZSBvZiBhIHNp bmdsZSBwYXRoIGFueSBtb3JlLiBGb3IgaW50ZXJlc3TigJlzIHNha2UsIHRoZSBkZWZhdWx0IHJy X21pbl9pb19ycSBvZiAxIHdhcyBhY3R1YWxseSBvbmUgb2YgdGhlIHdvcnN0IHBlcmZvcm1pbmcg dmFsdWVzLgo+IAo+IFdlIGFsc28gdHJpZWQga2VybmVsIDMuMTIgYW5kIHBlcmZvcm1hbmNlIHdh cyBhbHNvIGRlZ3JhZGVkIGJ1dCBub3QgcXVpdGUgYXMgYmFkIGFzIDQuMC41LiBJIGFtIHdvbmRl cmluZyBpZiB0aGVyZSB3YXMgc29tZSBzaWduaWZpY2FudCBjaGFuZ2Ugc2luY2UgMy4xMSAoZG0t bXVsdGlwYXRoIDEuNS4xKSBhbmQgMy4xMiAoZG0tbXVsdGlwYXRoIDEuNi4wKS4KCk5vdGhpbmcg c3RhbmRzIG91dCB0byBtZToKCiMgZ2l0IGxvZyAtLW9uZWxpbmUgLS10YWdzIC0tc291cmNlIGRy aXZlcnMvbWQvZG0uYyBkcml2ZXJzL21kL2RtLW1wYXRoLmMgfCBncmVwIDMuMTItIHwgdGFjCjY3 MDM2OGEgZG0tMy4xMi1jaGFuZ2VzIGRtOiBzdG9wIHVzaW5nIFdRX05PTl9SRUVOVFJBTlQKN2U3 ODJhZiB2My4xMi1yYzEgW1NDU0ldIFJldHVybiBFTk9EQVRBIG9uIG1lZGl1bSBlcnJvcgowMGM0 ZmMzIGRtLTMuMTItY2hhbmdlcyBkbSBpb2N0bDogaW5jcmVhc2UgZ3JhbnVsYXJpdHkgb2YgdHlw ZV9sb2NrIHdoZW4gbG9hZGluZyB0YWJsZQpmZDJlZDRkIGRtLTMuMTItY2hhbmdlcyBkbTogYWRk IHN0YXRpc3RpY3Mgc3VwcG9ydAo3NDI2ZDYyIHYzLjEyLXJjMSBNZXJnZSB0YWcgJ2RtLTMuMTIt Y2hhbmdlcycgb2YgZ2l0Oi8vZ2l0Lmtlcm5lbC5vcmcvcHViL3NjbS9saW51eC9rZXJuZWwvZ2l0 L2RldmljZS1tYXBwZXIvbGludXgtZG0KY2M5ZDNjMyBkbS0zLjEyLWZpeGVzIGRtIG1wYXRoOiBk byBub3QgZmFpbCBwYXRoIG9uIC1FTk9TUEMKZjg0Y2I4YSBkbS0zLjEyLWZpeGVzIGRtIG1wYXRo OiBkaXNhYmxlIFdSSVRFIFNBTUUgaWYgaXQgZmFpbHMKNmNmYTU4NSBkbS0zLjEyLWZpeGVzIGRt OiBsb3dlciBiaW8tYmFzZWQgbWVtcG9vbCByZXNlcnZhdGlvbgpmNDc5MDgyIGRtLTMuMTItZml4 ZXMgZG06IGFkZCByZXNlcnZlZF9ycV9iYXNlZF9pb3MgbW9kdWxlIHBhcmFtZXRlcgplODYwMzEz IGRtLTMuMTItZml4ZXMgZG06IGFkZCByZXNlcnZlZF9iaW9fYmFzZWRfaW9zIG1vZHVsZSBwYXJh bWV0ZXIKCi0tCmRtLWRldmVsIG1haWxpbmcgbGlzdApkbS1kZXZlbEByZWRoYXQuY29tCmh0dHBz Oi8vd3d3LnJlZGhhdC5jb20vbWFpbG1hbi9saXN0aW5mby9kbS1kZXZlbA==