Re: [Vectorlinux-devel] 64-bit Linux and Kernel 2.6.16

[Tony B. <tb...@gm...>]

On 3/21/06, Vanger <fa...@gm...> wrote:
>
> > Kernel 2.6.16 is out.  Lets all try it out and see if we can do the
> uevent
> > udev thing instead of hotplug and udev together.
> Just downloaded, will try.
>
> > Anyone who tries to say 64-bit is much better than 32-bit probably
> doesn't
> > know what they are talking about and are just going along with AMD and
> Intel
> > hype about 64-bit.
> Well, the kernel compiles on Slamd64 in about 1.5 times faster, then
> on VL. But that does not overweight the libraries' troubles.


Kernel compiles will be faster due to the 64 bit registers but overall spee=
d
is not much different.  There is some difference with 64 bit native apps bu=
t
not enough to justify losing the ease of use of 32 bit distros.  32-bit app=
s
run the same on 64 as they do on 32 unless they heavily use peripherals via
the kernel which would speed them up a bit as well.

> My Sempron 2800+( 1.6 Gig but
> > overclocked to 2.0 gig 200fsbX10) socket 754 cpu on the k8n mobo
> How did you do it? 2800+ has locked multiplier 8x.



My mistake - lol.  I meant to write 250x8 for 2.0 Gig.  Yes the x86_64 cpus
are multiplier locked.  My mobo allows me to raise the cpu fsb independant
of agp and memory speed.

> runs about the same as my old AthlonXP 2400+(2.0 Gig
> Well, usual system tasks are nearly the same. When you are doing some
> math and optimise the program for your architecture, K8 performs
> really better, then K7.


Yes but there are very few applications that take  full advantage of the
64-bit architecture at this time.  Some have been rewritten to include the
64 bit registers but not as optimized as they should be.  They are basicall=
y
ports of 32 bit.  This will hopefully change in the future.

I'm going to give Kanotix 64 a shot this evening which is just debian 64 bu=
t
I will also have to setup a 32-bit chroot environment for it or try the
ia32-libs install to see if that works for 32 bit apps.

I don't think simply installing a kernel that is x86_64 optimized would do
anything without using a 64-bit compiler and recompiling all libraries that
have 64-bit ports.

If VL goes 64-bit, it would have to be total 64-bit with 32 bit libs for
those apps that won't compile under 64 bit.


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