Re: 2.4.13-pre5-aa1 O_DIRECT drastic HIGHMEM performance hit

Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 25 Oct 2001 18:20:35 +0100 (BST)

> Are we stuck with a low mem configuration or are there workarounds that
> would allow us to stick with the initial 2GB of RAM and still get ~200
> MB/sec.

Jens has patches for doing direct DMA I/O from highmem pages. That should
basically nullify that hit. Doing that mainstream is a 2.5 thing really
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