On Mon, Oct 3, 2022 at 11:12 PM Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx> wrote: > > This will allow a configuration to specify bfq or kyber for all single queue > devices That's the idea > , which include SMR HDDs. Since these can only use mq-deadline (or none > if the user like living dangerously), this default config-based solution is not > OK in my opinion. I don't think this is true - elevator_init_mq will call elevator_get_by_features, not elevator_get_default for SMR hdds (and other zoned devices), as it sets required_elevator_features. > > What is wrong with using a udev rule to set the default disk scheduler ? Most > distros do that already anyway, so this config may not even be that useful in > practice. What is the use case here ? > > > -- > Damien Le Moal > Western Digital Research >
