On Fri, Apr 17, 2026 at 05:57:20PM -0500, Mike Christie wrote: > The following patches were made over Linus's and Martin's 7.1 trees. > They fix an issue where for virtio-scsi we export a lot of non-scsi > devices but are getting throttled by the cmd_per_lun_limit too early. > For example we export 1 or more NVMe or block devices and would like > to just pass command to them in way where virtio-scsi's hw queue > limits match the physical hardware. Or in some cases we are doing > cgroup based throttling on the host side, and we don't want the guest > to block IO when the host knows we have extra bandwidth. > > The patches add a new cmd_per_lun value so drivers can indicate > when to avoid tracking queueing at the device wide level. They > then rely on just the block layer hw queue limits. And the patches > convert virtio-scsi. They also fix some can_queue related issues > discovered while testing/reviewing.
Hi Mike, Is there a difference between setting cmd_per_lun to U32_MAX with your patches versus setting cmd_per_lun to the virtqueue size without your patches (this can already be done today without code changes in the driver)? Thanks, Stefan
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