On Fri, 2018-01-12 at 12:18 -0500, Mike Snitzer wrote: > This is going upstream for 4.16: > https://git.kernel.org/pub/scm/linux/kernel/git/snitzer/linux.git/commit/?h=dm-4.16&id=5b18cff4baedde77e0d69bd62a13ae78f9488d89 That is really gross. I have explained many times in detail on the dm-devel list why that blk_mq_delay_run_hw_queue() call is necessary. So I think it is wrong if you remove it. Isn't the responsibility of you as the device mapper kernel maintainer to avoid regressions instead of introducing regressions? Bart.