From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jan Beulich" Subject: Re: further post-Meltdown-bad-aid performance thoughts Date: Fri, 19 Jan 2018 09:36:22 -0700 Message-ID: <5A622C9602000078001A0847@prv-mh.provo.novell.com> References: <5A6210B502000078001A06A5@prv-mh.provo.novell.com> <6134e80b-8fd0-8a7d-61c8-df5892685c63@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from all-amaz-eas1.inumbo.com ([34.197.232.57]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ecaHR-0005I1-Es for xen-devel@lists.xenproject.org; Fri, 19 Jan 2018 17:16:41 +0000 In-Reply-To: <6134e80b-8fd0-8a7d-61c8-df5892685c63@citrix.com> Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: George Dunlap Cc: George Dunlap , Andrew Cooper , xen-devel List-Id: xen-devel@lists.xenproject.org Pj4+IE9uIDE5LjAxLjE4IGF0IDE2OjQzLCA8Z2VvcmdlLmR1bmxhcEBjaXRyaXguY29tPiB3cm90 ZToKPiBPbiAwMS8xOS8yMDE4IDAyOjM3IFBNLCBKYW4gQmV1bGljaCB3cm90ZToKPj4gQWxsLAo+ PiAKPj4gYWxvbmcgdGhlIGxpbmVzIG9mIHRoZSByZWxhdGl2ZWx5IGVhc3kgZmlyc3Qgc3RlcCBz dWJtaXR0ZWQgeWVzdGVyZGF5LAo+PiBJJ3ZlIGhhZCBzb21lIGZ1cnRoZXIgdGhvdWdodHMgaW4g dGhhdCBkaXJlY3Rpb24uIEEgZnVuZGFtZW50YWwKPj4gdGhpbmcgZm9yIHRoaXMgaXMgb2YgY291 cnNlIHRvIGZpcnN0IG9mIGFsbCBlc3RhYmxpc2ggd2hhdCBraW5kIG9mCj4+IGluZm9ybWF0aW9u IHdlIGNvbnNpZGVyIHNhZmUgdG8gZXhwb3NlIChpbiB0aGUgbG9uZyBydW4pIHRvIGd1ZXN0cy4K Pj4gCj4+IFRoZSBjdXJyZW50IHN0YXRlIG9mIHRoaW5ncyBpcyBkZWVtZWQgaW5jb21wbGV0ZSwg eWV0IGRlc3BpdGUgbXkKPj4gZWFybGllciBpbnF1aXJpZXMgSSBoYXZlbid0IGhlYXJkIGJhY2sg YW55IGNvbmNyZXRlIGV4YW1wbGUgb2YKPj4gaW5mb3JtYXRpb24sIGV4cG9zdXJlIG9mIHdoaWNo IGRvZXMgYW55IGhhcm0uIFdoaWxlIGl0IHNlZW1zIHRvIGJlCj4+IGdlbmVyYWxseSBiZWxpZXZl ZCB0aGF0IGxhcmdlIHBhcnRzIG9mIHRoZSBYZW4gaW1hZ2Ugc2hvdWxkIG5vdCBiZQo+PiBleHBv c2VkLCBpdCdzIG5vdCBhbGwgdGhhdCBjbGVhciB0byBtZSB3aHkgdGhhdCB3b3VsZCBiZS4gSSBj b3VsZAo+PiBhZ3JlZSB3aXRoIGJldHRlciBoaWRpbmcgd3JpdGFibGUgZGF0YSBwYXJ0cyBvZiBp dCwganVzdCB0byBiZSBvbiB0aGUKPj4gc2FmZSBzaWRlIChJJ20gdW5hd2FyZSBvZiBzdGF0aWNh bGx5IGFsbG9jYXRlZCBkYXRhIHRob3VnaCB3aGljaAo+PiBtaWdodCBjYXJyeSBhbnkgc2VjcmV0 cyksIGJ1dCB3aGF0IHdvdWxkIGJlIHRoZSBwb2ludCBvZiBoaWRpbmcKPj4gY29kZSBhbmQgci9v IGRhdGE/IEFueW9uZSB3YW50aW5nIHRvIGtub3cgdGhlaXIgY29udGVudHMgY2FuCj4+IHNpbXBs eSBvYnRhaW4gdGhlIFhlbiBiaW5hcnkgZm9yIHRoZWlyIHBsYXRmb3JtLgo+IAo+IFRoaXMgdGFp bHMgaW50byBhIGRpc2N1c3Npb24gSSB0aGluayB3ZSBzaG91bGQgaGF2ZSBhYm91dCBkZWFsaW5n IHdpdGgKPiBTUDEsIGFuZCBhbHNvIGZ1dHVyZS1wcm9vZmluZyBhZ2FpbnN0IGZ1dHVyZSBzcGVj dWxhdGl2ZSBleGVjdXRpb24gYXR0YWNrcy4KPiAKPiBSaWdodCBub3cgdGhlcmUgYXJlICJ3aW5k b3dzIiB0aHJvdWdoIHdoaWNoIHBlb3BsZSBjYW4gbG9vayB1c2luZyBTUDEtMywKPiB3aGljaCB3 ZSBhcmUgdHJ5aW5nIHRvIGNsb3NlLiAgU1AxJ3MgIndpbmRvdyIgaXMgdGhlIGd1ZXN0IC0+IGh5 cGVydmlzb3IKCkkgdGhpbmsgeW91IG1lYW4gU1AzIGhlcmUuCgo+IHZpcnR1YWwgYWRkcmVzcyBz cGFjZSAoaGVuY2UgWFBUSSwgc2VwYXJhdGluZyB0aGUgYWRkcmVzcyBzcGFjZXMpLgo+IFNQMidz ICJ3aW5kb3ciIGlzIGJyYW5jaC10YXJnZXQtcG9pc29uZWQgZ2FkZ2V0cyAoaGVuY2UgdXNpbmcg cmV0cG9saW5lCj4gYW5kIHZhcmlvdXMgdGVjaG5pcXVlcyB0byBwcmV2ZW50IGJyYW5jaCB0YXJn ZXQgcG9pc29uaW5nKS4gIFNQMSdzCj4gIndpbmRvdyIgaXMgYXJyYXkgYm91bmRhcnkgcHJpdmls ZWdlIGNoZWNrcywgaGVuY2UgTGludXgncyBhdHRlbXB0cyB0bwo+IHByZXZlbnQgc3BlY3VsYXRp b24gb3ZlciBwcml2aWxlZ2UgY2hlY2tzIGJ5IHVzaW5nIGxmZW5jZSBvciBvdGhlcgo+IHRyaWNr c1sxXS4KPiAKPiBCdXQgdGhlcmUgd2lsbCBzdXJlbHkgYmUgbW9yZSBhdHRhY2tzIGxpa2UgdGhp cyAoaW4gZmFjdCwgdGhlcmUgbWF5Cj4gYWxyZWFkeSBiZSBzb21lIGluIHRoZSB3b3Jrc1syXSku Cj4gCj4gU28gd2hhdCBpZiBpbnN0ZWFkIG9mIHRyeWluZyB0byBjbG9zZSB0aGUgIndpbmRvd3Mi LCB3ZSBtYWRlIGl0IHNvIHRoYXQKPiB0aGVyZSB3YXMgbm90aGluZyB0aHJvdWdoIHRoZSB3aW5k b3dzIHRvIHNlZT8gIElmIG5vIG1hdHRlciB3aGF0IHRoZQo+IGh5cGVydmlzb3Igc3BlY3VsYXRp dmVseSBleGVjdXRlZCwgbm90aGluZyBzZW5zaXRpdmUgd2FzIHZpc2liaWxlIGV4Y2VwdAo+IHdo YXQgYSB2Y3B1IHdhcyBhbHJlYWR5IGFsbG93ZWQgdG8gc2VlLAoKSSB0aGluayB5b3UgZGlkbid0 IGZpbmlzaCB5b3VyIHNlbnRlbmNlIGhlcmUsIGJ1dCBJIGFsc28gdGhpbmsgSQpjYW4gZ3Vlc3Mg dGhlIG1pc3NpbmcgcGFydC4gVGhlcmUncyBhIHByaWNlIHRvIHBheSBmb3Igc3VjaCBhbgphcHBy b2FjaCB0aG91Z2ggLSBpdGVyYXRpbmcgb3ZlciBkb21haW5zLCBvciB2Q1BVLXMgb2YgYQpkb21h aW4gKGp1c3QgYXMgYW4gZXhhbXBsZSkgd291bGRuJ3QgYmUgc2ltcGxlIGxpc3Qgd2Fsa3MKYW55 bW9yZS4gVGhlcmUgYXJlIGNlcnRhaW5seSBvdGhlciB0aGluZ3MuIElPVyAtIHllcywgYW5kCmFw cHJvYWNoIGxpa2UgdGhpcyBzZWVtcyBwb3NzaWJsZSwgYnV0IHdpdGggYWxsIHRoZSBsb3N0CnBl cmZvcm1hbmNlIEkgdGhpbmsgd2Ugc2hvdWxkbid0IGdvIG92ZXJib2FyZCB3aXRoIGZ1cnRoZXIK aGlkaW5nLgoKSmFuCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5v cmcKaHR0cHM6Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZl bA==