Jeff V. Merkey writes:
>
> Dirty pages should be flushed as fast as possible (they should become
> eligible after 2 seconds to being flushed out to disk). Pre-6 does have
> some problems.
> >
> > Hi, all. I know there's been grumbling about VM/IO/LRU's/page aging
> > recently. To give an idea of how bad it is:
> >
> > I have a drive that is capable of delivering >12 MB/s. By using dd on
> > the block device (reading in more data than I have RAM), I quickly get
> > to a state where I'm getting << 1 MB/s. My guess is that I'm getting
> > 100 kB/s or less. Once this happens, it seems easiest to reboot to
> > bring things back to a sane state.
> >
> > It seems the current LRU algorithm is "Least Recently Used pages will
> > remain in RAM the longest". I'd call that a BFULRU.
These pages aren't dirty. I was doing
# time dd if=$device of=/dev/null bs=1024k
Regards,
Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca
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