Re: Anti-Linux SMP FUD

Rik van Riel (riel@nl.linux.org)
Fri, 5 Feb 1999 11:29:37 +0100 (CET)

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?
+-------------------------------------------------------------------+
| Linux Memory Management site: http://humbolt.geo.uu.nl/Linux-MM/ |
| Nederlandse Linux documentatie: http://www.nl.linux.org/ |
+-------------------------------------------------------------------+

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/