I had experience with the 486DX4-100 with VLB and I ran a transfer test software that test the performance of the hard drive and I was able to get approx 1.3MB/s and my friend had a 486DX2-66 with onboard IDE and it was able to transfer 4.5MB/s. The onboard IDE was a PCI circuit. But you getting faster performance with older ISA card than VLB card, I have no idea why. CH > 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 > -- > "Look, Ma, no obsolete quotes and plain text only!" > -- To unsubscribe: mail [EMAIL PROTECTED] with "unsubscribe" as the Subject.
