From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: dm-cache with zero hit rate Date: Fri, 2 Aug 2013 09:23:44 -0400 Message-ID: <20130802132344.GA20629@redhat.com> References: <20130731185017.GA13215@uio.no> <20130731202522.GD18513@redhat.com> <20130802084910.GA21756@uio.no> 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: <20130802084910.GA21756@uio.no> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: "Steinar H. Gunderson" Cc: Heinz Mauelshagen , dm-devel@redhat.com, ejt@redhat.com List-Id: dm-devel.ids T24gRnJpLCBBdWcgMDIgMjAxMyBhdCAgNDo0OWFtIC0wNDAwLApTdGVpbmFyIEguIEd1bmRlcnNv biA8c2d1bmRlcnNvbkBiaWdmb290LmNvbT4gd3JvdGU6Cgo+IE9uIFdlZCwgSnVsIDMxLCAyMDEz IGF0IDA0OjI1OjIyUE0gLTA0MDAsIE1pa2UgU25pdHplciB3cm90ZToKPiA+PiBBZnRlciBhIGZh aXIgYW1vdW50IG9mIGZpZ2h0aW5nIHdpdGggdWRldiBhbmQgaW5pdHJhbWZzLXRvb2xzLCBwbHVz IHVwcGluZwo+ID4+IHRoZSBibG9jayBzaXplIHRvIDIwNDggc2luY2UgNTEyIGNvbXBsYWluZWQg YWJvdXQgbm90IGVub3VnaCBSQU0gKG9uIGEgMjRHQgo+ID4+IG1hY2hpbmUhKSwgdGhpcyBzZWVt cyB0byBib290IHVwIGFuZCB3b3JrLCBidXQgSSBzZWVtIHRvIGdldCBhYnNvbHV0ZWx5IHplcm8K PiA+PiBjYWNoZSBoaXRzLgo+ID4gS3Vkb3MgdG8geW91IGZvciBoYWNraW5nIHRoYXQgdG8gd29y ay4KPiAKPiBJdCdzIGFjdHVhbGx5IG5vdCB0aGF0IGhhcmQ7IG9uY2UgdGhpbmdzIHN0YWJpbGl6 ZSBhbmQgSSBrbm93IHRoaXMgaXMKPiBhY3R1YWxseSB0aGUgc29sdXRpb24gSSB3YW50IHRvIGhh dmUsIEkgcGxhbiB0byBzaXQgZG93biBhbmQgZG9jdW1lbnQgaXQsIGFuZAo+IGl0J3Mgbm90IGdv aW5nIHRvIGJlIGEgbG9uZyBkb2N1bWVudC4KPiAKPiA+IFBsZWFzZSBzZWUgdGhlIHJlY2VudCAi ZG0tY2FjaGUgd2FybWluZyB0aHJlYWQiOgo+ID4gaHR0cHM6Ly93d3cucmVkaGF0LmNvbS9hcmNo aXZlcy9kbS1kZXZlbC8yMDEzLUp1bHkvbXNnMDAxMzMuaHRtbAo+ID4gCj4gPiBUaGF0IGlzbid0 IHRvIHNheSB3ZSBjYW5ub3QgdGFrZSBzdGVwcyB0byBiZSBtb3JlIGFnZ3Jlc3NpdmU7IGJ1dCB3 ZSdsbAo+ID4gbmVlZCBtb3JlIGNvbnRleHQgZm9yIHdoYXQgeW91J3JlIGRvaW5nLgo+ID4gCj4g PiBBIG5vcm1hbCBzeXN0ZW0gYm9vdCBpcyBsaWtlbHkgcHJlZG9taW5hbnRseSByZWFkIG9uY2Us IGFuZC9vciAoYXMgSm9lCj4gPiBwb2ludGVkIG91dCkgdGhlIHBhZ2UgY2FjaGUgY291bGQgYmUg bWFza2luZyBzdWJzZXF1ZW50IHJlYWRzLgo+ID4gCj4gPiBJZiB5b3UncmUgZG9pbmcgd3JpdGUg aGVhdnkgd29ya2xvYWRzIGFyZSB0aGV5IGJlaW5nIGVsaWRlZCBieSB0aGUKPiA+IHNlcXVlbnRp YWxfdGhyZXNob2xkPwo+ID4gCj4gPiBUcnkgYSBnaXQgY2hlY2tvdXQsIGFuZCBzd2l0Y2ggYnJh bmNoZXMgYSBmZXcgdGltZXMgKGUuZy4gY2hlY2tvdXQgdjMuMSwKPiA+IHRoZW4gdjMuOCwgdGhl biB2My4yLCB0aGVuIHYzLjksIHRoZW4gdjMuMSwgZXRjKS4KPiAKPiBPSywgc28gY29udGV4dDog VGhpcyBpcyBteSBwZXJzb25hbCBkby1ldmVyeXRoaW5nIHNlcnZlciwgc28gaXQgZG9lcyBhbGwK PiBraW5kcyBvZiB0aGluZ3M7IHdlYiBzZXJ2aW5nIChib3RoIHBhZ2VzLCBzY3JpcHRzIGFuZCBt aXJyb3JzKSwgbGFyZ2UgZmlsZXMsCj4gZGF0YWJhc2Ugd29yaywgZW1haWwgKGxvY2FsLCBub3Qg SU1BUCksIGJhY2t1cCB0aHJvdWdoIHJzeW5jLCBldGMuLiBBbHRob3VnaAo+IGl0IGhhcyAyNEdC IG9mIFJBTSwgdGhlIGRpc2sgc2V0IGlzIDhUQiAoYW5kIHRoZSBjYWNoZSBkaXNrcyB+NDUwR0Ip LCBzbyBvbmUKPiB3b3VsZCB0aGluayBpdCBmb3VuZCBfc29tZXRoaW5nXyByZWxldmFudCB0byBj YWNoZS4gSW4gcGFydGljdWxhciwgbXkKPiBNYWlsZGlycyB3b3VsZCBzZWVtIGxpa2UgYSBwcmlt ZSBjYW5kaWRhdGUgOi0pIFRoZXJlJ3MgSS9PIGdvaW5nIG9uIGFsbCB0aGUKPiB0aW1lLCBhbmQg SSdtIGEgYml0IHN1cnByaXNlZCB0aGF0IG5vdCBldmVuIGFueSB3cml0ZXMgYXJlIGNhY2hlZC4g CgpZZXMsIGl0IGlzIHN1cnByaXNpbmcuICBDdXJpb3VzIHRvIGtub3cgaWYgdGhlIHByb21vdGlv bnMgYXJlbid0CmhhcHBlbmluZyBkdWUgdG8gdGhlIElPIHNjaGVkdWxlciBzb21laG93IG1lcmdp bmcgYWxsIHlvdXIgcmFuZG9tIHNtYWxsCklPLiAgV2UgZG9uJ3QgeWV0IGhhdmUgYSBkZXNjcmV0 ZSBjb3VudGVyIHRvIHNob3cgdGhlIG51bWJlciBvZgptaWdyYXRpb25zIHRoYXQgd2VyZSBza2lw cGVkIGR1ZSB0byBzZXF1ZW50aWFsX3RocmVzaG9sZCBidXQgdGhhdCBpcwpzb21ldGhpbmcgd2Ug Y2FuIGFkZC4KCkJ1dCB5b3UgY2FuIGVmZmVjdGl2ZWx5IGRpc2FibGUgdGhlIHNlcXVlbnRpYWxf dGhyZXNob2xkIGJ5IHNldHRpbmcgaXQKcmVhbGx5IGhpZ2gsIGUuZy46CgpkbXNldHVwIG1lc3Nh Z2UgY2FjaGUgMCBzZXF1ZW50aWFsX3RocmVzaG9sZCAxNjM4NAoKPiBJIGRpZCB0aGUgZ2l0IGNo ZWNrb3V0IGFzIHlvdSBhc2tlZCwgMTDigJMxNSB0aW1lcyB3aXRoIGRpZmZlcmVudCB2ZXJzaW9u Cj4gbnVtYmVycywgYW5kIGFsdGhvdWdoIHRoZSBnaXQgY29tbWFuZCBzZWVtZWQgdG8gY3JlYXRl IEkvTyAoaWUuLCB0aGUgcGFnZQo+IGNhY2hlIHdhc24ndCBnb2JibGluZyBpdCBhbGwgdXAsIGFs dGhvdWdoIGl0IHdhcyBtb3N0bHkgd3JpdGUgSS9PKSwgYnV0IGl0Cj4gc3RpbGwgZGlkbid0IHB1 dCBhbnl0aGluZyBpbiB0aGUgY2FjaGUuCgpQbGVhc2Ugd3JpdGUgYSBmaWxlIHRoYXQgaXMgc21h bGxlciB0aGFuIHlvdXIgc3BlY2lmaWVkCnNlcXVlbnRpYWxfdGhyZXNob2xkLCBhbmQgdGhlbiBy ZWFkIGl0IG51bWVyb3VzIHRpbWVzIHZpYSBkaXJlY3QgSU8sCmUuZy46CgpkZCBpZj08eW91ciBm aWxlPiBvZj0vZGV2L251bGwgaWZsYWc9ZGlyZWN0IGJzPTE2SwogCj4gSSBzZWUgdGhlIHRocmVh ZCB5b3UncmUgcmVmZXJyaW5nIHRvIHNheXMg4oCcdG9vIGxvd+KAnSwgYnV0IEkgcmVhbGx5IGhh dmUgemVybywKPiBldmVuIGFmdGVyIGFsbW9zdCA0MCBob3VycyBvZiBub3JtYWwgb3BlcmF0aW9u Ogo+IAo+ICAgY2FjaGU6IDAgMjM0NDA4OTE5MDQgY2FjaGUgOTEzLzgxOTIgMCA2ODg4MTQ0IDAg MTY1MzY3NyAwIDAgMCAwIDAgMiBtaWdyYXRpb25fdGhyZXNob2xkIDIwNDggNCByYW5kb21fdGhy ZXNob2xkIDggc2VxdWVudGlhbF90aHJlc2hvbGQgNTEyCj4gCj4gQ291bGQgdGhlIGxhcmdlIGJs b2NrIHNpemUgYmUgcmVsYXRlZCB0byB0aGlzPwoKTm8sIGEgbGFyZ2UgY2FjaGUgYmxvY2sgc2l6 ZSBqdXN0IGJyaW5ncyBhIGxvdCBtb3JlIGludG8gdGhlIGNhY2hlIHdoZW4Kc29tZXRoaW5nIHdh cyBkZWVtZWQgd29ydGh5IG9mIHByb21vdGlvbi4KCldlIG5lZWQgdG8gYmV0dGVyIHVuZGVyc3Rh bmQvZGlhZ25vc2UgX3doeV8gbm90aGluZyBpcyBnZXR0aW5nIHByb21vdGVkLAp0byB0aGF0IGVu ZCBIZWlueiBhbmQgSm9lIHdpbGwgY29sbGFib3JhdGUgb24gdGhlIGRldmVsb3BtZW50IG9mIGEK ImNhY2hlX2R1bXAiIHV0aWxpdHkgdG8gYWxsb3cgdmlzaWJpbGl0eSBpbnRvIHRoZSBtcSBwb2xp Y3kncyBoaXQgY291bnRzCmFuZCBoaW50cyBhc3NvY2lhdGVkIHdpdGggZWFjaCBibG9jay4KCkJ1 dCBpbiB0aGUgbWVhbnRpbWUsIGNyYW5raW5nIHVwIHNlcXVlbnRpYWxfdGhyZXNob2xkIG1heSBo ZWxwLgoKTWlrZQoKLS0KZG0tZGV2ZWwgbWFpbGluZyBsaXN0CmRtLWRldmVsQHJlZGhhdC5jb20K aHR0cHM6Ly93d3cucmVkaGF0LmNvbS9tYWlsbWFuL2xpc3RpbmZvL2RtLWRldmVs