On 18/05/2016 17:49, Emmanuel Lacour wrote: > Dear kvm developpers/users, > > I just saw that a change has been made in the kernel so the only one > scheduler available in guests for virtio-blk is now "none". > > Seems introduced by [1]. Not by this one; rather this one: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1cf7e9c68fe84248174e998922b39e508375e7c1 > I tried to used ionice on a 3.16 guest with virtio-blk and in fact it no > longer works because cfq is no longer available. > > Is there a way to use, inside a guest, a tool like ionice to set > different IO priority in guests processes? It's very useful for loering > down the performance impact of backups jobs for example. > > [1] - > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a98755c559e0e944a44174883b74a97019e3a367 > -- Not anymore unfortunately. The effect of this change was not advertised enough, in my opinion. The blk-mq path should have replaced the code used by use_bio=1, but not the code used by use_bio=0. Thanks, Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
