Re: [libvirt] Automatically affinitize hostdev interrupts to vm vCpus (qemu/kvm)

On Mon, Aug 18, 2014 at 07:01:40PM +0000, Mooney, Sean K wrote: Hi, could you convince your e-mail agent to wrap long lines? Nice that this will be abstracted out in a separate file, although if it's not huge, it can be part of something else. So it will only affect hostdevs, OK, that means there should be less (or no) disadvantages). Although beware that hostdevs can be plugged/unplugged, number of vCPUs can be changed and, most importantly, the affinities (either set with sched_set_affinity or using cgroups) can be changed during the lifetime of the VM, and the smp_affinity of each IRQ should track such changes. Needless to say the affinity should be restored after the machine dies/is turned off, etc., not just on hostdev unplug. I like defaulting to auto also because the transparent use will have effect only in existing deployments with vCPU pinning. Although this version might be preferred by others. This can, however, be discussed (and changed) during reviews. Since this mailing-list is public and archived, such disclaimer is unenforceable. As an upstream project, the development is done in the open. Such statements as the above one may be the cause of nobody replying for some time to your e-mail. The statement itself can be understood that even delivering the mail through a list is prohibited. Please consider removing such statements in following e-mails (or use private e-mail address if the disclaimer is enforced by your employer) as keeping them may result in the rest of the community not being able to communicate with you. Martin