Or maybe on NUMA nodes.
On Wed, May 24, 2017 at 3:03 PM, Martin Sivak <msi...@redhat.com> wrote: >> In order to maximize performance we may also want to limit the number of >> other VMs (either regular or high performance) running on the same >> host. This to minimize the interference and the resource stealing. >> >> >> In the extreme case, just the selected high performance VM would be >> allowed to run on one suitable host. > > I would base this on cores. You can have two HPF VMs when each is > pinned to distinct set of CPUs. > > Martin > > On Wed, May 24, 2017 at 2:11 PM, Francesco Romani <from...@redhat.com> wrote: >> On 05/24/2017 12:57 PM, Michal Skrivanek wrote: >>> Hi all, >>> we plan to work on an improvement in VM definition for high performance >>> workloads which do not require desktop-class devices and generally favor >>> highest possible performance in expense of less flexibility. >>> We’re thinking of adding a new VM preset in addition to current Desktop and >>> Server in New VM dialog, which would automatically pre-select existing >>> options in the right way, and suggest/warn on suboptimal configuration >>> All the presets and warning can be changed and ignored. There are few >>> things we already identified as boosting performance and/or minimize the >>> complexity of the VM, so we plan the preset to: >>> - remove all graphical consoles and set the VM as headless, making it >>> accessible by serial console. >>> - disable all USB. >>> - disable soundcard. >>> - enable I/O Threads, just one for all disks by default. >>> - set host cpu passthrough (effectively disabling VM live migration), add >>> I/O Thread pinning in a similar way as the existing CPU pinning. >>> We plan the following checks and suggest to perform CPU pinning, host >>> topology == guest topology (number of cores per socket and threads per core >>> should match), NUMA topology host and guest match, check and suggest the >>> I/O threads pinning. >>> A popup on a VM dialog save seems suitable. >>> >>> currently identified task and status can be followed on trello card[1] >>> >>> Please share your thoughts, questions, any kind of feedback… >> >> In order to maximize performance we may also want to limit the number of >> other VMs (either regular or high performance) running on the same >> host. This to minimize the interference and the resource stealing. >> >> >> In the extreme case, just the selected high performance VM would be >> allowed to run on one suitable host. >> >> Bests, >> >> -- >> Francesco Romani >> Senior SW Eng., Virtualization R&D >> Red Hat >> IRC: fromani github: @fromanirh >> >> _______________________________________________ >> Devel mailing list >> Devel@ovirt.org >> http://lists.ovirt.org/mailman/listinfo/devel _______________________________________________ Devel mailing list Devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/devel
