From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Dunlap Subject: Re: further post-Meltdown-bad-aid performance thoughts Date: Mon, 22 Jan 2018 12:33:41 +0000 Message-ID: References: <5A6210B502000078001A06A5@prv-mh.provo.novell.com> <6134e80b-8fd0-8a7d-61c8-df5892685c63@citrix.com> <5A622C9602000078001A0847@prv-mh.provo.novell.com> <5A65BC0102000078001A0ED5@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1edbII-0000CQ-0s for xen-devel@lists.xenproject.org; Mon, 22 Jan 2018 12:33:46 +0000 In-Reply-To: <5A65BC0102000078001A0ED5@prv-mh.provo.novell.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Jan Beulich Cc: George Dunlap , Andrew Cooper , xen-devel List-Id: xen-devel@lists.xenproject.org T24gMDEvMjIvMjAxOCAwOToyNSBBTSwgSmFuIEJldWxpY2ggd3JvdGU6Cj4+Pj4gT24gMTkuMDEu MTggYXQgMTg6MDAsIDxnZW9yZ2UuZHVubGFwQGNpdHJpeC5jb20+IHdyb3RlOgo+PiBPbiAwMS8x OS8yMDE4IDA0OjM2IFBNLCBKYW4gQmV1bGljaCB3cm90ZToKPj4+Pj4+IE9uIDE5LjAxLjE4IGF0 IDE2OjQzLCA8Z2VvcmdlLmR1bmxhcEBjaXRyaXguY29tPiB3cm90ZToKPj4+PiBTbyB3aGF0IGlm IGluc3RlYWQgb2YgdHJ5aW5nIHRvIGNsb3NlIHRoZSAid2luZG93cyIsIHdlIG1hZGUgaXQgc28g dGhhdAo+Pj4+IHRoZXJlIHdhcyBub3RoaW5nIHRocm91Z2ggdGhlIHdpbmRvd3MgdG8gc2VlPyAg SWYgbm8gbWF0dGVyIHdoYXQgdGhlCj4+Pj4gaHlwZXJ2aXNvciBzcGVjdWxhdGl2ZWx5IGV4ZWN1 dGVkLCBub3RoaW5nIHNlbnNpdGl2ZSB3YXMgdmlzaWJpbGUgZXhjZXB0Cj4+Pj4gd2hhdCBhIHZj cHUgd2FzIGFscmVhZHkgYWxsb3dlZCB0byBzZWUsCj4+Pgo+Pj4gSSB0aGluayB5b3UgZGlkbid0 IGZpbmlzaCB5b3VyIHNlbnRlbmNlIGhlcmUsIGJ1dCBJIGFsc28gdGhpbmsgSQo+Pj4gY2FuIGd1 ZXNzIHRoZSBtaXNzaW5nIHBhcnQuIFRoZXJlJ3MgYSBwcmljZSB0byBwYXkgZm9yIHN1Y2ggYW4K Pj4+IGFwcHJvYWNoIHRob3VnaCAtIGl0ZXJhdGluZyBvdmVyIGRvbWFpbnMsIG9yIHZDUFUtcyBv ZiBhCj4+PiBkb21haW4gKGp1c3QgYXMgYW4gZXhhbXBsZSkgd291bGRuJ3QgYmUgc2ltcGxlIGxp c3Qgd2Fsa3MKPj4+IGFueW1vcmUuIFRoZXJlIGFyZSBjZXJ0YWlubHkgb3RoZXIgdGhpbmdzLiBJ T1cgLSB5ZXMsIGFuZAo+Pj4gYXBwcm9hY2ggbGlrZSB0aGlzIHNlZW1zIHBvc3NpYmxlLCBidXQg d2l0aCBhbGwgdGhlIGxvc3QKPj4+IHBlcmZvcm1hbmNlIEkgdGhpbmsgd2Ugc2hvdWxkbid0IGdv IG92ZXJib2FyZCB3aXRoIGZ1cnRoZXIKPj4+IGhpZGluZy4KPj4KPj4gUmlnaHQsIHNvIHRoZSBu ZXh0IHF1ZXN0aW9uOiB3aGF0IGluZm9ybWF0aW9uICpmcm9tIG90aGVyIGd1ZXN0cyogYXJlCj4+ IHNlbnNpdGl2ZT8KPj4KPj4gT2J2aW91c2x5IHRoZSBndWVzdCByZWdpc3RlcnMgYXJlIHNlbnNp dGl2ZS4gIEJ1dCBob3cgbXVjaCBvZiB0aGUKPj4gaW5mb3JtYXRpb24gaW4gdmNwdSBzdHJ1Y3Qg dGhhdCB3ZSBhY3R1YWxseSBuZWVkIHRvIGhhdmUgInRvIGhhbmQiIGlzCj4+IGFjdHVhbGx5IHNl bnNpdGl2ZSBpbmZvcm1hdGlvbiB0aGF0IHdlIG5lZWQgdG8gaGlkZSBmcm9tIG90aGVyIFZNcz8K PiAKPiBOb25lLCBJIHRoaW5rLiBCdXQgdGhhdCdzIG5vdCB0aGUgbWFpbiBhc3BlY3QgaGVyZS4g c3RydWN0IHZjcHUKPiBpbnN0YW5jZXMgY29tZSBhbmQgZ28sIHdoaWNoIHdvdWxkIG1lYW4gd2Un ZCBoYXZlIHRvCj4gcGVybWFuZW50bHkgdXBkYXRlIHdoYXQgaXMgb3IgaXMgbm90IGJlaW5nIGV4 cG9zZWQgaW4gdGhlIHBhZ2UKPiB0YWJsZXMgdXNlZC4gVGhpcywgd2hpbGUgc29sdmFibGUsIGlz IGdvaW5nIHRvIGJlIGEgc2lnbmlmaWNhbnQKPiBidXJkZW4gaW4gdGVybXMgb2Ygc3luY2hyb25p emluZyBwYWdlIHRhYmxlcyAoaWYgd2UgY29udGludWUgdG8KPiB1c2UgcGVyLUNQVSBvbmVzKSBh bmQvb3IgVExCIHNob290ZG93bi4gV2hlcmVhcyBpZiBvbmx5IHRoZQo+IHJ1bm5pbmcgdkNQVSdz IHN0cnVjdHVyZSAoYW5kIGl0J3Mgc3RydWN0IGRvbWFpbikgYXJlIGV4cG9zZWQsCj4gbm8gc3Vj aCBzeW5jaHJvbml6YXRpb24gaXMgbmVlZGVkICh0aGluZ3Mgd291bGQgc2ltcGx5IGJlCj4gdXBk YXRlZCBkdXJpbmcgY29udGV4dCBzd2l0Y2gpLgoKSSdtIG5vdCBzdXJlIHdlJ3JlIGFjdHVhbGx5 IGNvbW11bmljYXRpbmcuCgpDb3JyZWN0IG1lIGlmIEknbSB3cm9uZzsgYXQgdGhlIG1vbWVudCwg dW5kZXIgWFBUSSwgaHlwZXJjYWxscyBydW5uaW5nCnVuZGVyIFhlbiBzdGlsbCBoYXZlIGFjY2Vz cyB0byBhbGwgb2YgaG9zdCBtZW1vcnkuICBUbyBwcm90ZWN0IGFnYWluc3QKU1AzLCB3ZSByZW1v dmUgYWxtb3N0IGFsbCBYZW4gbWVtb3J5IGZyb20gdGhlIGFkZHJlc3Mgc3BhY2UgYmVmb3JlCnN3 aXRjaGluZyB0byB0aGUgZ3Vlc3QuCgpXaGF0IEknbSBwcm9wb3NpbmcgaXMgc29tZXRoaW5nIGxp a2UgdGhpczoKCiogV2UgaGF2ZSBhICJnbG9iYWwiIHJlZ2lvbiBvZiBYZW4gbWVtb3J5IHRoYXQg aXMgbWFwcGVkIGJ5IGFsbApwcm9jZXNzb3JzLiAgVGhpcyB3aWxsIGNvbnRhaW4gZXZlcnl0aGlu ZyB3ZSBjb25zaWRlciBub3Qgc2Vuc2l0aXZlOwppbmNsdWRpbmcgWGVuIHRleHQgc2VnbWVudHMs IGFuZCBtb3N0IGRvbWFpbiBhbmQgdmNwdSBkYXRhLiAgQnV0IGl0IHdpbGwKKm5vdCogbWFwIGFs bCBvZiBob3N0IG1lbW9yeSwgbm9yIGhhdmUgYWNjZXNzIHRvIHNlbnNpdGl2ZSBkYXRhLCBzdWNo IGFzCnZjcHUgcmVnaXN0ZXIgc3RhdGUuCgoqIFdlIGhhdmUgcGVyLWNwdSAibG9jYWwiIHJlZ2lv bnMuICBJbiB0aGlzIHJlZ2lvbiB3ZSB3aWxsIG1hcCwKb24tZGVtYW5kLCBndWVzdCBtZW1vcnkg d2hpY2ggaXMgbmVlZGVkIHRvIHBlcmZvcm0gY3VycmVudCBvcGVyYXRpb25zLgooV2UgY2FuIGNv bnNpZGVyIGhvdyBzdHJpY3RseSB3ZSBuZWVkIHRvIHVubWFwIG1lbW9yeSBhZnRlciB1c2luZyBp dC4pCldlIHdpbGwgYWxzbyBtYXAgdGhlIGN1cnJlbnQgdmNwdSdzIHJlZ2lzdGVycy4KCiogT24g ZW50cnkgdG8gYSA2NC1iaXQgUFYgZ3Vlc3QsIHdlIGRvbid0IGNoYW5nZSB0aGUgbWFwcGluZyBh dCBhbGwuCgpOb3csIG5vIG1hdHRlciB3aGF0IHRoZSBzcGVjdWxhdGl2ZSBhdHRhY2sgLS0gU1Ax LCBTUDIsIG9yIFNQMyAtLSBhIHZjcHUKY2FuIG9ubHkgYWNjZXNzIGl0cyBvd24gUkFNIGFuZCBy ZWdpc3RlcnMuICBUaGVyZSdzIG5vIGV4dHJhIG92ZXJoZWFkIHRvCmNvbnRleHQgc3dpdGNoaW5n IGludG8gb3Igb3V0IG9mIHRoZSBoeXBlcnZpc29yLgoKR2l2ZW4gdGhhdCwgSSBkb24ndCB1bmRl cnN0YW5kIHdoYXQgdGhlIGZvbGxvd2luZyBjb21tZW50cyBtZWFuOgoKIlRoZXJlJ3MgYSBwcmlj ZSB0byBwYXkgZm9yIHN1Y2ggYW4gYXBwcm9hY2ggdGhvdWdoIC0gaXRlcmF0aW5nIG92ZXIKZG9t YWlucywgb3IgdkNQVS1zIG9mIGEgZG9tYWluIChqdXN0IGFzIGFuIGV4YW1wbGUpIHdvdWxkbid0 IGJlIHNpbXBsZQpsaXN0IHdhbGtzIGFueW1vcmUuIgoKSWYgd2UgcmVtb3ZlIHNlbnNpdGl2ZSBp bmZvcm1hdGlvbiBmcm9tIHRoZSBkb21haW4gYW5kIHZjcHUgc3RydWN0cywKdGhlbiBhbnkgYml0 IG9mIGh5cGVydmlzb3IgY29kZSBjYW4gaXRlcmF0ZSBvdmVyIGRvbWFpbiBhbmQgdmNwdSBzdHJ1 Y3RzCmF0IHdpbGw7IG9ubHkgaWYgdGhleSBhY3R1YWxseSBuZWVkIHRvIHJlYWQgb3Igd3JpdGUg c2Vuc2l0aXZlIGRhdGEgd2lsbAp0aGV5IGhhdmUgdG8gcGVyZm9ybSBhbiBleHBlbnNpdmUgbWFw L3VubWFwIG9wZXJhdGlvbi4gIEJ1dCBpbiBnZW5lcmFsLAp0byByZWFkIGFub3RoZXIgdmNwdSdz IHJlZ2lzdGVycyB5b3UgYWxyZWFkeSBuZWVkIHRvIGRvIGEgdmNwdV9wYXVzZSgpIC8KdmNwdV91 bnBhdXNlKCksIHdoaWNoIGludm9sdmVzIGF0IGxlYXN0IHR3byBJUElzICh3aXRoIG9uZQpzcGlu LWFuZC13YWl0KSwgc28gaXQgZG9lc24ndCBzZWVtIGxpa2UgdGhhdCBzaG91bGQgYWRkIGEgbG90 IG9mIGV4dHJhCm92ZXJoZWFkLgoKInN0cnVjdCB2Y3B1IGluc3RhbmNlcyBjb21lIGFuZCBnbywg d2hpY2ggd291bGQgbWVhbiB3ZSdkIGhhdmUgdG8KcGVybWFuZW50bHkgdXBkYXRlIHdoYXQgaXMg b3IgaXMgbm90IGJlaW5nIGV4cG9zZWQgaW4gdGhlIHBhZ2UgdGFibGVzCnVzZWQuIFRoaXMsIHdo aWxlIHNvbHZhYmxlLCBpcyBnb2luZyB0byBiZSBhIHNpZ25pZmljYW50IGJ1cmRlbiBpbiB0ZXJt cwpvZiBzeW5jaHJvbml6aW5nIHBhZ2UgdGFibGVzIChpZiB3ZSBjb250aW51ZSB0byB1c2UgcGVy LUNQVSBvbmVzKSBhbmQvb3IKVExCIHNob290ZG93bi4iCgpJIGRvbid0IHVuZGVyc3RhbmQgd2hh dCB0aGlzIGlzIHJlZmVycmluZyB0byBpbiBteSBwcm9wb3NlZCBwbGFuIGFib3ZlLgoKIC1HZW9y Z2UKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1k ZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8v bGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9saXN0aW5mby94ZW4tZGV2ZWw=