<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">We have use cases in our cloud which require vCPU-to-NUMA_node pinning</div><div class="">to maximise the CPU performance available in the guests. From what we’ve</div><div class="">seen, there was no further improvement when the vCPUs were mapped</div><div class="">one-to-one to pCPUs (we did not study this in detail, though, as with the</div><div class="">NUMA node pinning the performance was sufficiently close to the physical</div><div class="">one).</div><div class=""><br class=""></div><div class="">To implement this, we specify the numa_nodes extra_spec for the corresponding</div><div class="">flavor and rely on nova’s placement policy.</div><div class=""><br class=""></div><div class="">HTH,</div><div class=""> Arne</div><div class=""><br class=""></div><div class="">—</div><div class="">Arne Wiebalck</div><div class="">CERN IT</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class="">On 08 Jul 2016, at 19:22, Steve Gordon <<a href="mailto:sgordon@redhat.com" class="">sgordon@redhat.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">----- Original Message -----</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">From: "Brent Troge" <<a href="mailto:brenttroge2016@gmail.com" class="">brenttroge2016@gmail.com</a>><br class="">To:<span class="Apple-converted-space"> </span><a href="mailto:openstack@lists.openstack.org" class="">openstack@lists.openstack.org</a><br class="">Sent: Friday, July 8, 2016 9:59:58 AM<br class="">Subject: [Openstack] vCPU -> pCPU MAPPING<br class=""><br class="">context - high performance private cloud with cpu pinning<br class=""><br class="">Is it possible to map vCPUs to specific pCPUs ?<br class="">Currently I see you can only direct which vCPUs are mapped to a specific<br class="">NUMA node<br class=""><br class="">hw:numa_cpus.0=1,2,3,4<br class=""></blockquote><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Just in addition to Jay's comment, the above does not do what I suspect you think it does. The above tells Nova to expose vCPUs 1, 2, 3, and 4 in *guest* NUMA node 0 when building the guest NUMA topology in the Libvirt XML. Nova will endeavor to map these vCPUs to pCPUs on the same NUMA node on the host as *each other* but that will not necessarily be NUMA node *0* on the host depending on resource availability.</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Thanks,</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Steve</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">However, to get even more granular, is it possible to create a flavor which<br class="">maps vCPU to specific pCPU within a numa node ?<br class=""><br class="">Something like:<br class="">hw:numa_cpus.<NUMA-NODE>-<pCPU>=<vCPU><br class=""><br class="">hw:numa_cpus.0-1=1<br class="">hw:numa_cpus.0-2=2<br class=""><br class=""><br class="">Thanks!<br class=""><br class="">_______________________________________________<br class="">Mailing list: <a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack" class="">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack</a><br class="">Post to : <a href="mailto:openstack@lists.openstack.org" class="">openstack@lists.openstack.org</a><br class="">Unsubscribe : <a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack" class="">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack</a><br class=""><br class=""></blockquote><br style="font-family: Helvetica; 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