Messages in this thread |  | | From | "Dale Farnsworth" <> | Date | Tue, 6 Feb 2001 08:52:23 -0700 | Subject | Re: VIA silent disk corruption - patch |
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In article <20010205190527.A314@colonel-panic.com>, Peter Horton <pdh@colonel-panic.com> wrote: > + * VIA VT8363 host bridge has broken feature 'PCI Master Read > + * Caching'. It caches more than is good for it, sometimes > + * serving the bus master with stale data. Some BIOSes enable > + * it by default, so we disable it.
Another data point:
I have an ASUS A7V motherboard with via vt82c686a and Promise pdc20265 IDE controllers. I noticed disk data corruption when I enabled DMA. The corrupted data was 4K bytes long on 4K byte boundaries and occurred about once for every couple of gigabytes copied via cpio. I saw this corruption when the disks were connected to the pdc20265 as well as to the 686a.
I also noticed that turning off read caching eliminated the corruption.
However, if I enable the BIOS parameter "I/O Recovery Time", I can still enable read caching without seeing any data corruption. The lastest BIOS revision (1005C) enables "I/O Recovery Time" by default where the previous revision I had (1004D) did not.
-Dale
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Dale Farnsworth dale@farnsworth.org
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