Date: Tue, 12 Mar 2013 08:19:43 -0700 From: Jim Harris <jim.harris@gmail.com> To: lev@freebsd.org Cc: Konstantin Belousov <kostikbel@gmail.com>, arch@freebsd.org Subject: Re: Unmapped buffers: to be merged in several days Message-ID: <CAJP=Hc_1Z%2BgEL2N_X0L3fzFG80bY3MhwJyQ0HY9D1%2B_k45tM6A@mail.gmail.com> In-Reply-To: <913397478.20130312105326@serebryakov.spb.ru> References: <20130311091852.GR3794@kib.kiev.ua> <86k3pe1cl3.fsf@ds4.des.no> <20130311182454.GX3794@kib.kiev.ua> <329178079.20130312010425@serebryakov.spb.ru> <20130311211158.GE3794@kib.kiev.ua> <CAJP=Hc9V9HVpdevD3=Qgk812CYwbmc-Q4HgtPyupb7zTfmTB6g@mail.gmail.com> <913397478.20130312105326@serebryakov.spb.ru>
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On Mon, Mar 11, 2013 at 11:53 PM, Lev Serebryakov <lev@freebsd.org> wrote: > Hello, Jim. > You wrote 12 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2013 =D0=B3., 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 =3D 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.
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