Comment 576 for bug 595047
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#576 |
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bbfa235
(Get the code!)
(In reply to comment #540)
> That would be like, specifically configuring
> the kernel to use PIO? Why would anyone do that?
The kernel can fall back to PIO mode if DMA mode is encountering problems (which can happen with faulty hardware). It happens with CD/DVD drives more often than with hard drives.
The next time you encounter system sluggishness and the mouse cursor starts skipping, see if you can get a readout of /proc/meminfo (while the sluggishness is happening). If your "MemFree" is very low *and* your "Cached" or "Dirty" is very high, then you might be suffering from this bug.