> zach.brown> The addition of the interrupt masking spin lock acquiry in
> zach.brown> dio_bio_submit() looks alarming. This lock acquiry existed in
> zach.brown> that path before the recent dio completion patch set. We
> zach.brown> shouldn't expect significant performance regression from
> zach.brown> returning to the behaviour that existed before the completion
> zach.brown> clean up work.
>
> Are you going to quantify this at all? I think we should.
I could try to take a swing at it next week, sure.
Leaving it for Ken is pretty tempting, though :)
- z
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