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Re: Fedora 9 32 or 64 Bit - Which One?



On Mon, 2008-10-27 at 16:14 +0000, Alan Cox wrote:
> On Mon, 27 Oct 2008 11:54:47 -0400
> Matthew Flaschen <matthew flaschen gatech edu> wrote:
> 
> > Alan Cox wrote:
> > 
> > > The moment you have more than about 900MB of RAM there are big advantages
> > > to running a 64bit kernel as it can keep all of physical and virtual
> > > space mapped at the same time, which is a big performance win.
> > > 
> > > Alan
> > 
> > Can you point to any benchmarks showing a significant performance gain
> > for a 1 GB desktop user?
> 
> I'm not aware of anyone having sat down and run formal benchmarks on the
> Fedora desktop. One of the problems with that is that you need a
> reproducable representative benchmark typically scripting all the mouse
> clicks and keypresses, using identical data sets and so on. They are hard
> to produce and I'm not aware of any Linux ones that don't involve payment
> of large sums of money to third party who runs their own closed secret
> test and produces a number you can stick up in lights. So let me turn the
> question around - given that the evidence from microbenchmarks and CPU
> architects is that 64bit is the better choice can you show any
> good quality benchmarks showing it isn't a win ?
> 
> There are real benchmark numbers for CPU performance, relative code
> density and the like and you can generate mapping cost benchmarks. AMD
> and Intel have published various studies on the former two. There are
> lots of benchmarks for server performance because there is money in that
> market so people actually TPC and other things to sell enterprise product.
> 
> However if you cared about performance you wouldn't be running Gnome or
> Kde ;)
> 
> Alan
> 
I understand the point but Linux benchmarks exist such as the ones
below:
http://lbs.sourceforge.net/
--
=======================================================================
Sometimes I wonder if I'm in my right mind. Then it passes off and I'm
as intelligent as ever. -- Samuel Beckett, "Endgame"
=======================================================================
Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam sbcglobal net


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