[resending with CC fixed] Matt,
as you most likely know, ZFS/FreeBSD already has ability to use TRIM command with disks that support it. As the command can be quite slow and it is a maintenance kind of command, it makes sense to assign a very low priority to it. I've come up with the following change that introduces a new priority for the TRIM zios: http://people.freebsd.org/~avg/zfs-trim-priority.diff To be honest, this change actually attempts to restore what we already had in FreeBSD before I merged your write throttle & i/o scheduler performance work. Could you please review the change? I am not sure if I correctly translated my intent to the min_active and max_active values. I will greatly appreciate your help with these. Thank you! -- Andriy Gapon
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