> ꀠ啱'm not sure where the concurrency is breaking down on the RAID subsystem,
> ꀠ湶t could be due to that particular driver still being under the big
> ꀠ淸iant lock (the AHCI and SILI drivers don't use the bgl, but arcmsr
> ꀠ氽river probably still does).
>
arcmsr uses lockmgr and is not under the mplock at all. Which is not
to say it isn't still serializing internally somewhere, but it should
not be any different than FreeBSD in this regard.
Sam