Re: 2.4: mylex and > 2GB RAM

From: Zwane Mwaikambo
Date: Mon Dec 08 2003 - 15:42:50 EST


On Mon, 8 Dec 2003, Per Andreas Buer wrote:

> William Lee Irwin III <wli@xxxxxxxxxxxxxx> writes:
>
> > If your memory ended at 2GB and the driver had 31-bit DMA, it may have
> > decided to use unconstrained allocations. Then, when you added more RAM,
> > it was forced to ask for <= 896MB, which made it copy to buffers that are
> > actually below 896MB most of the time.
>
> But this would reduce the throuput only a few percent, right? My system
> slows down from writing ~ 100MB/s to maybe 50KB/s.

How is overall system performance, ie non disk IO related?
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