[ovirt-devel] high performance VM preset

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… Thanks, michal [1] https://trello.com/c/MHRDD8ZO