On Mon, 16 Feb 2009 09:02:20 +0100, Craig Ringer  
<craig AT postnewspapers.com DOT au> wrote:

> Try setting the high priority job to -c1 (realtime) and the bacula fd to  
> -c3 (idle) priority.

Bacula is already at -c3, I'm not supposed to touch the other app,  
unfortunately. Thanks for your other suggestions, I'll forward those to  
the responsible parties as well.

> I landed up having to hack the sources of the driver for my 3Ware  
> Escalade 8500-8 to get decent I/O latency, since the driver queued up to  
> 256 (!!) requests internally. This prevented Linux from pre-empting  
> already issued I/O with higher priority new I/O requests.

As much as I would like to do this kind of thing I have more pressing  
matters occupying my time :)


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