From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: [RFC PATCH 21/24] ARM: vITS: handle INVALL command Date: Tue, 6 Dec 2016 22:36:39 +0100 Message-ID: <1481060199.3445.103.camel@citrix.com> References: <20160928182457.12433-1-andre.przywara@arm.com> <20160928182457.12433-22-andre.przywara@arm.com> <0fce93d4-605b-78b9-9146-b4d65eb4e86a@arm.com> <4a8bb842-bac5-942f-ca84-d223f43ab50b@arm.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============3770456671300499459==" Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cENPr-0002C7-K1 for xen-devel@lists.xenproject.org; Tue, 06 Dec 2016 21:36:47 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Stefano Stabellini , Julien Grall Cc: Andre Przywara , Steve Capper , george.dunlap@citrix.com, Vijay Kilari , xen-devel List-Id: xen-devel@lists.xenproject.org --===============3770456671300499459== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="=-lRODuDyCTRhyXdLkKbUu" --=-lRODuDyCTRhyXdLkKbUu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2016-12-05 at 11:51 -0800, Stefano Stabellini wrote: > Another approach is to let the scheduler know that migration is > slower. > In fact this is not a new problem: it can be slow to migrate > interrupts, > even few non-LPIs interrupts, even on x86. I wonder if the Xen > scheduler > has any knowledge of that (CC'ing George and Dario). I guess that's > the > reason why most people run with dom0_vcpus_pin. > Oh, and about this last sentence. I may indeed be lacking knowledge/understanding, but if you think this is a valid use case for dom0_vcpus_pin, I'd indeed be interested in knowing why. In fact, that configuration has always looked rather awkward to me, and I think we should start thinking stopping providing the option at all (or changing/extending its behavior). So, if you think you need it, please spell that out, and let's see if there are better ways to achieve the same. :-) Thanks and Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-lRODuDyCTRhyXdLkKbUu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJYRy9nAAoJEBZCeImluHPut4UP/A9V9e1lfHoMP4G66zIcTLt7 i7Nr6nGpPNSyYR8heGWwoSH2RNc0UfeYMXY9WXUWtvfIcETEQ+V/EK3VmkoKIuC5 ipeowrs6/u7gVtU0a+QpkZnq3N7WiY/FfU349JnAj7JLE/E0oj5dpEZOpw2marHZ M6tY3LuKseuC9nzfC6nGd/RprJyJdVVsNoAZ2YaCrOBRSPhhC06nhWj3RyXHvqe+ 7f8u7oWzWQOFXF4Daw4U/SZXMbHdFCay9f0Til+MZdyWMxarMsNmJSCincZiWVdF hgR6HUi9kbCljIi+tuBt3H/ktCCnWB/0YvKgE6a3mT2ywtOHR5BN8CMXsGmwhOkz lNPU9ZzfKsr3UOKXXJ64hEpLDctLl6A8gULE9vjAo67qybjhTX0O/GBlQ074kYLD QE1opuQaRBkisjYPIIEFYqmUcMW29DcTCxxctYdg4k/IBqjP76EEBahVtRMlJFwA 3+J63qJ7lgq9ML0umuOYeS5H73jqjuGw+9EUx2tYP0sleQSR1aEygnOWFB+kwst/ +ZIHlF1FPXwxDwsg9mszc0BLO5BRlM/TP7uiZ8m2zNRV1X1TkdfpLhltkxULrQCN M/m2zeYoRXfr47ALGa67OKTBYwp9Dxa93GYjV/oIWILvQH6R7sSaqwPu1JysxCRu nlS52knJwPmm3NL4AjPV =864R -----END PGP SIGNATURE----- --=-lRODuDyCTRhyXdLkKbUu-- --===============3770456671300499459== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVs IG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpodHRwczovL2xpc3RzLnhlbi5v cmcveGVuLWRldmVsCg== --===============3770456671300499459==--