Re: linux does not see my RAM

[Tamas K Papp <tpapp@Princeton.EDU>]

On Fri, Oct 28, 2005 at 09:32:15PM +1000, Benjamin Herrenschmidt wrote:

> > > Actually, if you don't want to take the perfs. hit caused by
> > > CONFIG_HIGHMEM, you can also play around with TASK_SIZE and KERNELBASE
> > > values in the .config :) But if you don't know what it's all about, then
> > > don't even try ! Besides, it will break yaboot.
> > 
> > Benh, do you know how much the performance hit is ? 
> 
> Nope. Never actually measured :)

Ben and Sven,

I did not make any precise and measurements, but I am running
numerically intensive algorithms (MCMC and approximate dynamic
programming, they use quite a bit of memory too) which I time.  I
compared the log files with the ones before HIGHMEM kernels, and I see
no change in performance that is outside the range of measurement
error.

Tamas

-- 
Bayesian statistics is difficult in the sense that thinking is difficult.
--Donald A. Berry, American Statistician 51:242 (1997)