Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains

From: Manfred Spraul (
Date: Mon Feb 05 2001 - 07:00:51 EST

"Stephen C. Tweedie" wrote:
> You simply cannot do physical disk IO on
> non-sector-aligned memory or in chunks which aren't a multiple of
> sector size.

Why not?

Obviously the disk access itself must be sector aligned and the total
length must be a multiple of the sector length, but there shouldn't be
any restrictions on the data buffers.

I remember that even Windoze 95 has scatter-gather support for physical
disk IO with arbitraty buffer chunks. (If the hardware supports it,
otherwise the io subsystem will copy the data into a contiguous
temporary buffer)

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This archive was generated by hypermail 2b29 : Wed Feb 07 2001 - 21:00:21 EST