Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FSis under heavy write load (massive starvation)

[Andrew Morton]

On Sat, 28 Apr 2007 10:51:48 +0200 Matthias Andree <matthias.andree@xxxxxx> wrote:

> On Fri, 27 Apr 2007, Andrew Morton wrote:
> 
> > But none of this explains a 20-minute hang, unless a *lot* of fsyncs are
> > being performed, perhaps.
> 
> Another thing that is rather unpleasant (haven't yet tried fiddling with
> the dirty limits) is UDF to DVD-RAM - try rsyncing /home to a DVD-RAM,
> that's going to leave you with tons of dirty buffers that clear slowly
> -- "watch -n 1 grep -i dirty /proc/meminfo" is boring, but elucidating...
> 

yes, a few people are attacking that from various angles at present.  It's
tricky - writeback has to juggle a lot of balls.  We'll get there.

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