Re: [PROBLEM] NFS trouble - file corruptions

[Rasmus Bøg Hansen]

On 29 Nov 2002, Alan Cox wrote:

> 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.

I couldn't solve the problem by setting timing parameters...

However, the RTL8139-driver is now configured for PIO-mode instead of
MMIO-mode (CONFIG_8139TOO_PIO), and I don't see corruptions anymore.

Thank you all for your help!

/Rasmus

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