Re: 2.4.1pre8 slowdown on dbench tests

[Andi Kleen]

On Fri, Jan 19, 2001 at 02:47:45AM +0100, Jens Axboe wrote:
> On Fri, Jan 19 2001, Andi Kleen wrote:
> > > Yes I agree, that values should probably be tweaked a bit. I'll
> > > try and squeeze some testing in to generate the best possible
> > > values.
> > 
> > Please also add a sysctl. I always feel uncomfortable with such hardcoded
> > heuristics. There tends to be always another workload where the heuristic
> > fails and manual tuning is useful. 
> 
> Sure, we can do that. But it should only really make a difference
> for low memory machines, otherwise the numbers wouldn't change
> so much. So the limits are not really that important, and only
> need to be in the ball park.

Shouldn't it more depend on the bandwidth/latency of the IO device? 



-Andi
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