On Fri, Dec 07 2001, Marvin Justice wrote:
> > There is no way of fixing it.
>
> All I know is that a streaming io app I was playing with showed a drastic
> performance hit when the kernel was compiled with CONFIG_HIGHMEM. On W2K we
> saw no slowdown with 2 or even 4GB of RAM so I think solutions must exist.
That's because of highmem page bouncing when doing I/O. There is indeed
a solution for this -- 2.5 or 2.4 + block-highmem-all patches will
happily do I/O directly to any page in your system as long as your
hardware supports it. I'm sure we're beating w2k with that enabled :-)
-- Jens Axboe- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Dec 07 2001 - 21:00:41 EST