Subject: Re: Fastest disk tranfer rates
To: None <mark@causality.com>
From: Neil A. Carson <neil@causality.com>
List: port-arm32
Date: 11/29/1999 20:36:19
Mark Brinicombe wrote:

> raw reads:

...

Do you have any benchmarks as to what the rate is through the filing
system these days? Or did Curt's benchmark show that, I wasn't sure if
that actually related to the raw device or not?If so, 9MB/sec is pretty
respectable. What's the system time usage when doing that? Unless you're
doing access to the raw device (eg a database, not likely on an ARM) the
raw figures probably aren't that useful.

> The PDC20246 performance could be improved a bit if it upped the PCI bus
> speed to 33MHZ but at the moment on that system the PCI clock is derived
> from the FCLK.

Do you think that'd make a difference, since you should already be able
to sustain over 80MB/sec off the 25MHz bus? Maybe the latencies would
affect things a bit, but since the PCI latencies suck anyway it might
not help that much.

	N.