From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin ESTRABAUD Subject: Re: Using Video cards (CUDA) for RAID parity Date: Thu, 12 Dec 2013 11:44:51 +0000 Message-ID: <52A9A1B3.5080706@mpstor.com> References: <52A98FAF.4000205@insync.za.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <52A98FAF.4000205@insync.za.net> Sender: linux-raid-owner@vger.kernel.org To: Pieter De Wit Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On several more RAID specific SoC (like the PowerPC 440x/460x) a XOR engine is included to speed up RAID calculations (effectively a hardware RAID engine). I think Intel Atom CPUs were planned/got a similar engine added, but with the advance in CPU efficiencies and frequencies, these XOR engines are practically obsolete: You will barely use 5% of your CPU (if a high end CPU) for the parity calculation on RAID5. These days it seems that the overhead from the parity calculations are so small that they become insignificant. On the other hand this is just based from my limited experience, maybe there are some cases where we would benefit from that. Regards, Ben. On 12/12/13 10:27, Pieter De Wit wrote: > Hi List, > > Given the recent work done with techs like CUDA etc. - has the idea been > floated to use the video card for RAID parity calculations vs the CPU ? > Bitcoin and plenty others have shown the true speed of these cards. This > might be a cheaper version of a RAID card. > > Cheers, > > Pieter > -- > 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 >