At least for the raid5 case that would seem to be a loss performance-wise:

- AFAIK, even a single good x86 core can XOR memory at faster than the DRAM memory bandwidth of the system.
- High end GPUs have more memory bandwidth than the x86 and could perform large XOR operations between buffers at a faster rate. But the memory bandwidth over the bus to the gfx card is lower than the main memory DRAM bandwidth, so you would have a net loss from having to move the data between the GPU and CPU.


-----Original Message-----
From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Pieter De Wit
Sent: Thursday, December 12, 2013 2:28 AM
To: linux-raid@vger.kernel.org
Subject: Using Video cards (CUDA) for RAID parity

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
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