svn commit: r196777 - head/sys/dev/ahci
Alexander Motin
mav at FreeBSD.org
Sat Sep 5 06:16:52 UTC 2009
John Baldwin wrote:
> On Thursday 03 September 2009 3:45:07 pm Ivan Voras wrote:
>> But ciss doesn't reference it at all so either it deviously assumes it
>> or is independent of it.
>
> Actually, it may be much worse, it may be that the author of ciss(4) new that
> ciss(4)'s largest supported I/O size was larger than 128k so they didn't
> bother handling the limit at all giving the false impression the hardware has
> no limit.
In cases of ATA and CAM infrastructures it was is so, that if driver
does not sets max_iosize or maxio respectively, it uses DFLTPHYS. So
problem is only about non-ATA/CAM RAIDs or cases where wrong value could
be specified explicitly.
ciss(4) driver was explicitly limited to 64K, until somebody could
review it's capabilities.
--
Alexander Motin
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