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SubjectRe: Anti-Linux SMP FUD
On Fri, 5 Feb 1999, Chris Wedgwood wrote:
> On Sat, Jan 30, 1999 at 09:39:35PM +0000, Alan Cox wrote:
>
> > Partly the paths are nothing like as serialized as you might think.
> > Sct has also done some patches (which DaveM then extended a lot) to
> > drop kernel locks during cached data copies too.
>
> Something I see often, is that having two processes running on an
> SMP box, accessing different devices, on different spindles --
> when one process is writing data out, the other pretty much blocks
> in a D state.

This is very annoying, yes. The fact that it happens
more so on IDE than on SCSI hints in the direction of
the request queue and the driver structure...

drivers/block/ll_rw_blk.h

Rik -- If a Microsoft product fails, who do you sue?
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