Re: IDE-DMA strangeness (another one)

John Kodis (
Thu, 3 Dec 1998 19:39:36 -0500

On Wed, Dec 02, 1998 at 11:43:34PM +0100, Kurt Garloff wrote:

> So 33MB/s is quite realistic [for reads from buffer cache], but in
> no way characteristic for your HD.

I get a similar speed, but don't understand why. I would expect that
given a 4-byte wide bus clocked at 33MHz performing a read from cache
and a write into the destination userspace buffer, the buffer cache
read speed should be more like 66MB/s. Is there another read/write
pair that I've overlooked?

-- John Kodis.

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