Hi folks,
I'm wondering about something: I have a 486DX2/66 box with Vesa Local Bus
(VLB). That machine also has a VLB IDE card (Promise 20x0 (2020, I
think)). What strikes me odd, though, is that the hard drive access on
this box is very slow: The 340MB Quantum drive I have in there only
gives me <=1.4MB/s according to hdparm. The very same drive in a P133
box (with onboard IDE) runs at 3.4MB/s, i.e. more than twice the speed I
get out of the VLB card. Funny enough, if I put an old ISA IDE card into
the 485, I get up to 1.6MB/s, i.e. faster(!) than the VLB card.
I've been browsing around the kernel documentation and found something
about a compile time option for 32bit access on VLB, but I didn't find
any way to enable suchh a thing. I also experimented with hdparm's
option to enable 32bit access, but that didn't change anything.
I also checked the usual suspects (IRQs/DMAs), but I can't see any
clashes.
Hence my question:
Am I actually right in expecting that a VLB IDE controller should give
me more speed than an ISA one or am I overlooking something here?
I just want to make sure that the system is running at optimum and not
accidentally having problems - I have no experience with VLB so far...
:-}
Thanks in advance,
Thomas
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"Look, Ma, no obsolete quotes and plain text only!"
Thomas Ribbrock | http://www.bigfoot.com/~kaytan | ICQ#: 15839919
"You have to live on the edge of reality - to make your dreams come true!"
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