On 1/16/24 15:34, Damien Le Moal wrote:
FYI, I am about to post 20-something patches that completely remove zone write locking and replace it with "zone write plugging". That is done above the IO scheduler and also provides zone append emulation for drives that ask for it. With this change: - Zone append emulation is moved to the block layer, as a generic implementation. sd and dm zone append emulation code is removed. - Any scheduler can be used, including "none". mq-deadline zone block device special support is removed. - Overall, a lot less code (the series removes more code than it adds). - Reordering problems such as due to IO priority is resolved as well. This will need a lot of testing, which we are working on. But your help with testing on UFS devices will be appreciated as well.
When posting this patch series, please include performance results (IOPS) for a zoned null_blk device instance. mq-deadline doesn't support more than 200 K IOPS, which is less than what UFS devices support. I hope that this performance bottleneck will be solved with the new approach. Thank you, Bart.
