On 29/05/2015 13:11, Andrey Korolyov wrote: > Sorry for a potential thread hijack, but I`m curious about the reasons > to not making advertised queue depth for non-passthrough backends an > independent tunable, is there any concerns behind that?
It certainly can be made tunable. Usually it is bounded actually, for example PATA has a queue depth of 1 (!) while AHCI has 32. For virtio (blk and scsi) it actually is already somewhat tunable, since the queue depth is limited by the size of the virtqueue. Paolo
