[nylug-talk] LOWMEM vs. HIGHMEM performance advantage?

[Ruben Safir]

On Thu, Apr 17, 2008 at 08:08:16AM -0700, Peter C. Norton wrote:
> On Thu, Apr 17, 2008 at 10:30:55AM -0400, jh wrote:
> > I have an application that appears to slow down once it starts using 
> > about 900 megs of memory.
> > 
> > Interestingly, from dmesg:
> > 
> > [42949372.960000] 1150MB HIGHMEM available.
> > [42949372.960000] 896MB LOWMEM available.
> > 
> > Is HIGHMEM slower, or are there circumstances or kernel configs such 
> > that I could be seeing such a slowdown once memory usage goes above a 
> > certain level?
> 
> Are you using a 2.4 kernel? I thought the split was moved much closer
> to the 4gb line in 2.6.
> 

Why do we still have this ancient DOS ritual?

Ruben

> http://www.linux.org/docs/ldp/howto/IO-Perf-HOWTO/overview.html
> 
> -Peter
> 
> 
> -- 
> The 5 year plan:
> In five years we'll make up another plan.
> Or just re-use this one.
> 
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