Mailinglist Archive: opensuse (5130 mails)

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Re: [SLE] Re: DMA, ATA standards, etc... -- WAS: Advantages of Dual Core
  • From: Per Jessen <per@xxxxxxxxxxxx>
  • Date: Mon, 29 May 2006 21:15:52 +0200
  • Message-id: <e5fh98$4p3$2@xxxxxxxxxxxxxxxx>
Carlos E. R. wrote:

> That I understand. But my question was in the line of why raid-5 uses,
> or has to use, PIO instead of DMA. What is so different for raid-5. I
> can guess, but I don't know.

I'm guessing what Bryan is trying to say is that every RAID5 write
requires CPU-cycles, even if the resulting data-write is almost
certainly done with DMA. So in effect RAID5 sort of becomes a little
like PIO.

/Per Jessen, Z├╝rich

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