Unmapped buffers: to be merged in several days

[Jim Harris]

On Mon, Mar 11, 2013 at 11:53 PM, Lev Serebryakov <lev at freebsd.org> wrote:

> Hello, Jim.
> You wrote 12 марта 2013 г., 2:22:47:
>
> JH> Please note that XOR checksumming support only exists in the
> JH> E5-1600/2400/2600/4600 series (Sandy Bridge Xeon) and C5500/C3500
> series
> JH> (Jasper Forest - based on Nehalem Xeon) processors.  The SNB Xeon
> series
>   And  what  about  ICHxR/ICHxDO (where x = 7, 8, 9, 10) chipsets? They
> support
> software RAID5 in Windows drivers, is it support pure-software? I
> understand, that it is not true-hardware RAID, but does they have XOR
> engine for unmapped buffers?
>
>
The XOR calculations for ICH-based RAID5 are all done strictly in software
on mapped buffers - no hardware offload.