From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Talbot Subject: Re: Does software RAID take advantage of SMP, or 64 bit CPU(s)? Date: Tue, 23 May 2006 07:44:59 -0700 Message-ID: <44731FEB.6020602@comcast.net> References: <4472A9FF.9060501@comcast.net> <17522.43808.68998.902497@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17522.43808.68998.902497@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids -Neil I was not looking for any direct advantage. It is more a money VS performance thing. I have a old dual proc Opteron motherboard. I am going with 64-bit, but it is much cheaper if I just go buy a nice single proc board instead of buying two Opterons for my dual proc board. If I could get a 1.5~2X performance improvement with SMP I would pay the extra money. If there is no major performance difference, I will take the cheap road. Thank you for the good input. -Adam P.S. Here is my current plan. RAID 6, 6X 400GB SATA 2.0 HDD's, Athlon FX 53, 1GB DDR 400, Nvidia based motherboard, Gb Ethernet. Storing 15,000+ MP3's, 500+ movies. Neil Brown wrote: > On Monday May 22, talbotx@comcast.net wrote: > >> A few simple questions about the 2.6.16+ kernel and software RAID. >> Does software RAID in the 2.6.16 kernel take advantage of SMP? >> > > Not exactly. RAID5/6 tends to use just one cpu for parity > calculations, but that frees up other cpus for doing other important > work. > > >> Does software RAID take advantage of 64-bit CPU(s)? >> > > No more or less that other code in the kernel. Sometimes using a 64-bit > CPU is a cost because more data is shuffled around... > > Was there some particular sort of 'advantage' that you were thinking > of? > > NeilBrown > > > >> If there are any good web sites that cover this information, a link >> would be GREAT! >> >> -Adam Talbot >> >> - >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > >