Re: [PROBLEM] NFS trouble - file corruptions

[Alan Cox]

On Fri, 2002-11-29 at 13:17, Rasmus Bøg Hansen wrote:
> I just tried turning off DMA on the server disk (this is just a low-end
> IDE-system): No errors in files (compressing the file thrice).
> 
> So it does not at all seem to be a NFS-issue!
> 
> I have no idea what is wrong. If the disk, cable or IDE controller does
> bit-flipping when DMA is turned on, why is the problem only seen with
> NFS? I have never seem corrupted files or metadata with DMA turned
> (except once long ago, when I experimented with high-transfer-modes - I
> haven't done that since)...

More likely it changes the timings. There is at least one other
possibility though. With some via bridges using slightly too slow DDR
RAM at a 133MHz clock works reliably _until_ you get a mix of CPU and
DMA traffic. It'll even pass memtest86.

So if its a VIA box, turn DMA back on, stick the bios into its load
failsafe defaults mode and see if that has an affect.

Alan