From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com ([192.55.52.136]:38474 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751048AbeEKPjX (ORCPT ); Fri, 11 May 2018 11:39:23 -0400 From: "Derrick, Jonathan" To: "hch@infradead.org" , "Busch, Keith" CC: "linux-pci@vger.kernel.org" , "Bauer, Scott" , "bhelgaas@google.com" Subject: Re: [PATCH] PCI/VMD: White list for fast interrupt handlers Date: Fri, 11 May 2018 15:39:21 +0000 Message-ID: <1526053159.7581.15.camel@intel.com> References: <20180508160022.30954-1-keith.busch@intel.com> <20180509043828.GA9413@infradead.org> <20180509152652.GA823@localhost.localdomain> In-Reply-To: <20180509152652.GA823@localhost.localdomain> Content-Type: multipart/signed; micalg=sha-1; protocol="application/x-pkcs7-signature"; boundary="=-sLVdO+WkTlN9ACtp4EaY" MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org List-ID: --=-sLVdO+WkTlN9ACtp4EaY Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-05-09 at 09:26 -0600, Keith Busch wrote: > On Tue, May 08, 2018 at 09:38:28PM -0700, Christoph Hellwig wrote: > > On Tue, May 08, 2018 at 10:00:22AM -0600, Keith Busch wrote: > > > Devices with slow interrupt handlers are significantly harming > > > performance > > > when their interrupt vector is shared with a fast device. This > > > patch > > > creates a class code white list for devices with known fast > > > interrupt > > > handlers, and all other devices will share a single vector so > > > they don't > > > interfere with performance. > > >=20 > > > At the moment, only the NVM Express class code is on the list, > > > but more > > > may be added if VMD users desire to use other low-latency devices > > > in > > > these domains. > >=20 > > I think this is far too much of a hack. Just don't use VMD if > > your > > care about performance. >=20 > I'm not aware of an easier way you can direct-assign an entire PCIe > domain > to a virtual machine. :) It's fine with me Acked-by: Jon Derrick: --=-sLVdO+WkTlN9ACtp4EaY Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIKeTCCBOsw ggPToAMCAQICEFLpAsoR6ESdlGU4L6MaMLswDQYJKoZIhvcNAQEFBQAwbzELMAkGA1UEBhMCU0Ux FDASBgNVBAoTC0FkZFRydXN0IEFCMSYwJAYDVQQLEx1BZGRUcnVzdCBFeHRlcm5hbCBUVFAgTmV0 d29yazEiMCAGA1UEAxMZQWRkVHJ1c3QgRXh0ZXJuYWwgQ0EgUm9vdDAeFw0xMzAzMTkwMDAwMDBa Fw0yMDA1MzAxMDQ4MzhaMHkxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJDQTEUMBIGA1UEBxMLU2Fu dGEgQ2xhcmExGjAYBgNVBAoTEUludGVsIENvcnBvcmF0aW9uMSswKQYDVQQDEyJJbnRlbCBFeHRl cm5hbCBCYXNpYyBJc3N1aW5nIENBIDRBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA 4LDMgJ3YSVX6A9sE+jjH3b+F3Xa86z3LLKu/6WvjIdvUbxnoz2qnvl9UKQI3sE1zURQxrfgvtP0b Pgt1uDwAfLc6H5eqnyi+7FrPsTGCR4gwDmq1WkTQgNDNXUgb71e9/6sfq+WfCDpi8ScaglyLCRp7 ph/V60cbitBvnZFelKCDBh332S6KG3bAdnNGB/vk86bwDlY6omDs6/RsfNwzQVwo/M3oPrux6y6z yIoRulfkVENbM0/9RrzQOlyK4W5Vk4EEsfW2jlCV4W83QKqRccAKIUxw2q/HoHVPbbETrrLmE6RR Z/+eWlkGWl+mtx42HOgOmX0BRdTRo9vH7yeBowIDAQABo4IBdzCCAXMwHwYDVR0jBBgwFoAUrb2Y ejS0Jvf6xCZU7wO94CTLVBowHQYDVR0OBBYEFB5pKrTcKP5HGE4hCz+8rBEv8Jj1MA4GA1UdDwEB /wQEAwIBhjASBgNVHRMBAf8ECDAGAQH/AgEAMDYGA1UdJQQvMC0GCCsGAQUFBwMEBgorBgEEAYI3 CgMEBgorBgEEAYI3CgMMBgkrBgEEAYI3FQUwFwYDVR0gBBAwDjAMBgoqhkiG+E0BBQFpMEkGA1Ud HwRCMEAwPqA8oDqGOGh0dHA6Ly9jcmwudHJ1c3QtcHJvdmlkZXIuY29tL0FkZFRydXN0RXh0ZXJu YWxDQVJvb3QuY3JsMDoGCCsGAQUFBwEBBC4wLDAqBggrBgEFBQcwAYYeaHR0cDovL29jc3AudHJ1 c3QtcHJvdmlkZXIuY29tMDUGA1UdHgQuMCygKjALgQlpbnRlbC5jb20wG6AZBgorBgEEAYI3FAID oAsMCWludGVsLmNvbTANBgkqhkiG9w0BAQUFAAOCAQEAKcLNo/2So1Jnoi8G7W5Q6FSPq1fmyKW3 sSDf1amvyHkjEgd25n7MKRHGEmRxxoziPKpcmbfXYU+J0g560nCo5gPF78Wd7ZmzcmCcm1UFFfIx fw6QA19bRpTC8bMMaSSEl8y39Pgwa+HENmoPZsM63DdZ6ziDnPqcSbcfYs8qd/m5d22rpXq5IGVU tX6LX7R/hSSw/3sfATnBLgiJtilVyY7OGGmYKCAS2I04itvSS1WtecXTt9OZDyNbl7LtObBrgMLh ZkpJW+pOR9f3h5VG2S5uKkA7Th9NC9EoScdwQCAIw+UWKbSQ0Isj2UFL7fHKvmqWKVTL98sRzvI3 seNC4DCCBYYwggRuoAMCAQICEzMAAKye+0C3syvSXOcAAAAArJ4wDQYJKoZIhvcNAQEFBQAweTEL MAkGA1UEBhMCVVMxCzAJBgNVBAgTAkNBMRQwEgYDVQQHEwtTYW50YSBDbGFyYTEaMBgGA1UEChMR SW50ZWwgQ29ycG9yYXRpb24xKzApBgNVBAMTIkludGVsIEV4dGVybmFsIEJhc2ljIElzc3Vpbmcg Q0EgNEEwHhcNMTcxMDE5MTcyNzI3WhcNMTgxMDE0MTcyNzI3WjBHMRowGAYDVQQDExFEZXJyaWNr LCBKb25hdGhhbjEpMCcGCSqGSIb3DQEJARYaam9uYXRoYW4uZGVycmlja0BpbnRlbC5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCz4TvOwEKxVEgGst/n3LricX9KG2YbHHvorBFb ggk/Wm7ZV9v/w5I5+M7SFD1CVS+MD24tlcL0mjddPXklsjPNmFb7TCXhppQMWqxwlS44iokDpHEF wx6DtwcIlfmvgPormri3U5V0gkRvnmiFSlQ2bUycWgxttAvR4sYjxLas7hE3jZJ1LJ9IxiD7VMNJ QWXSxxnOGZVf1tUTqC5uNv9wSvr8N7ZRYldP4nJ9JUFO7bazyoplxGlgxIR3+7I9TgbrUOziQCja AG6qjTBc2iB2iz6IVnzrBtQT5DR3KM6EqbMTwur8keTC11xls7lwWexzsSgt37V9UNKAqfsZPgcX AgMBAAGjggI3MIICMzAdBgNVHQ4EFgQUJRdznv8EeAa3g+3F5NKtNNctuBcwHwYDVR0jBBgwFoAU HmkqtNwo/kcYTiELP7ysES/wmPUwZQYDVR0fBF4wXDBaoFigVoZUaHR0cDovL3d3dy5pbnRlbC5j b20vcmVwb3NpdG9yeS9DUkwvSW50ZWwlMjBFeHRlcm5hbCUyMEJhc2ljJTIwSXNzdWluZyUyMENB JTIwNEEuY3JsMIGfBggrBgEFBQcBAQSBkjCBjzBpBggrBgEFBQcwAoZdaHR0cDovL3d3dy5pbnRl bC5jb20vcmVwb3NpdG9yeS9jZXJ0aWZpY2F0ZXMvSW50ZWwlMjBFeHRlcm5hbCUyMEJhc2ljJTIw SXNzdWluZyUyMENBJTIwNEEuY3J0MCIGCCsGAQUFBzABhhZodHRwOi8vb2NzcC5pbnRlbC5jb20v MAsGA1UdDwQEAwIHgDA8BgkrBgEEAYI3FQcELzAtBiUrBgEEAYI3FQiGw4x1hJnlUYP9gSiFjp9T gpHACWeB3r05lfBDAgFkAgEJMB8GA1UdJQQYMBYGCCsGAQUFBwMEBgorBgEEAYI3CgMMMCkGCSsG AQQBgjcVCgQcMBowCgYIKwYBBQUHAwQwDAYKKwYBBAGCNwoDDDBRBgNVHREESjBIoCoGCisGAQQB gjcUAgOgHAwaam9uYXRoYW4uZGVycmlja0BpbnRlbC5jb22BGmpvbmF0aGFuLmRlcnJpY2tAaW50 ZWwuY29tMA0GCSqGSIb3DQEBBQUAA4IBAQA5LNb+VnWY0V21FlNjnQ2BIb5gmlED29zwQiC5yezn 2SexgvN31129iJSkXuiBHdcVJiUAUPHYuxPRwumwbrkY6m+sYi9kIzKt+ZKNNAN4WbnavsbyRBlb cIn2E5swqD+sks8AmKivHmg+gFeboLaOf+EqVihIz1Wec1PpbX98R1t2ep7Y/81DD1fIjAWHl6Mq TJwjKQuYB01kkJdXZAGPXUQSARR1y2D1YpCkDqfGH2STaB4nenD4INSyhTGo5RV9wwTAibyrIq50 rnmvBnHTmICQVdHuIhG1gGmDLUAGqfrU3W2QJr9gkICdrTMgIEdd8s73wknaZxZKqfRxnMVQMYIC FzCCAhMCAQEwgZAweTELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAkNBMRQwEgYDVQQHEwtTYW50YSBD bGFyYTEaMBgGA1UEChMRSW50ZWwgQ29ycG9yYXRpb24xKzApBgNVBAMTIkludGVsIEV4dGVybmFs IEJhc2ljIElzc3VpbmcgQ0EgNEECEzMAAKye+0C3syvSXOcAAAAArJ4wCQYFKw4DAhoFAKBdMBgG CSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTE4MDUxMTE1MzkxOVowIwYJ KoZIhvcNAQkEMRYEFE901WCLBy80/2wiILqzJ3cxeraxMA0GCSqGSIb3DQEBAQUABIIBAA+nRf6i JCjFJt7pMLybGP7q34953h4V4gyRhRMmXPS/wKtf985sd0cylc2OExpXgYkMmJDTjHYRJDvTLLx3 RNeds2RIB+ceybCqEyaBQXWhJqmD0q9fadVaGZQ8nEGDZwyBZnSrWZTQs40y9uGSS2dN/ATQ3KSO L51cQ66G4MlK4lXfFGDODYFLTY4/3O7yoOFEaWAka7ZFulOGp2n8cizLwucMGBs+aXCyfkLgT/6d seQb/ldwm1Snex6usITIgiPIhPKqcadIagFVsGu4HOa+SG082Hpc5Q045dy3+VKTKg4wEHFpoiTU X8vd+jjBQg9pyyiEF5TiBNlIfFYmr8QAAAAAAAA= --=-sLVdO+WkTlN9ACtp4EaY--