Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 21 Oct 2003 19:40:44 +0100 | From | James Courtier-Dutton <> | Subject | Re: VIA IDE performance under 2.6.0-test7/8? |
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James Finnie wrote: > Hi guys; > > Am having trouble getting decent IDE performance from the 2.6.0-test8 kernel > (tested with 2.6.0-test7 kernel also, same issue). The platform is VIA > EPIA-ME6000 - with a VIA VT8235 southbridge. Under 2.4.21 I get around > 40Mb/s in hdparm -t and 70Mb/s for hdparm -T. Under the 2.6.0-test7/8 I > only manage 13Mb/s & 52Mb/s respectively! I've attached my .config, and the > output of /proc/ide/via, dmesg, and hdparm info. I don't think I'm doing > anything particularly stupid here, but if I am, hit me with a wet fish > please :) > > Thanks for all help, > > James > Can you also send the output from "cat /proc/interrupts". It looks like you are not using IO-APIC, but instead using XT-PIC. XT-PIC is a lot slower than IO-APIC.
Just turn on SMB support in the "make menuconf", and it should enable IO-APIC.
If you cannot boot using IO-APIC, you probably have one of the bad VIA motherboards. I have not determined if the IO-APIC issues with VIA VT8235 MBs is hardware or software related. All I know, is some VIA VT8235 MBs work, and some don't. I am still investigating why.
Cheers
James
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