add BIO_NORETRY flag, implement support in ata_da, use in ZFS vdev_geom

Julian Elischer julian at
Fri Dec 29 05:29:00 UTC 2017

On 24/11/17 6:30 pm, Andriy Gapon wrote:
> Anyone interested is welcome to join the review.
> Thanks.

I see you closed the review.

However don't stop working with that problem..

It's still something that a worth a solution, even if not exactly That 
Maybe a generic idea through the block IO layer of transaction 
We did face this issue in a BSD4.3 variant in 1990 where a single disk 
would result in a cascading shockwave of slowdowns that took some time 
to resolve.
The issue even comes up in networking too, especially with realtime video
where "don't bother, we missed the window" comes into play.

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