On 3/13/06, Pantelis Antoniou <[email protected]> wrote:
> On Monday 13 March 2006 20:27, Sam Ravnborg wrote:
> > On Mon, Mar 13, 2006 at 09:17:47AM +0100, Arjan van de Ven wrote:
> > > On Sun, 2006-03-12 at 21:40 -0300, j4K3xBl4sT3r wrote:
> > > > Hello all,
> > > >
> > > > I've been seeing many Linux versions, with many features, some of them
> > > > just for the newest branches (2.4.x and 2.6.x), I would like to know
> > > > for which kind of system each kernel is recommended. On the distros
> > > > that we see inside the Net there is the 2.4.x series, normally I
> > > > update to 2.6.x (in case of my Slackware 10.2, even getting problems
> > > > with some devices). Is that floppy disks uses only 2.0.x and 2.2.x
> > > > Kernels? If applicable, where can I get (detailed) information about
> > > > these issues? I'm new on Kernel managing, started doing my own distros
> > > > at less than one month and would like to know it.
> > >
> > > regardless of the size issue; you should really not start any new
> > > projects based on 2.4 kernels; they are in deep deep maintenance mode
> > > for now, but it's unclear how long they will be (I suppose as long as
> > > people keep sending patches), especially complex security issues should
> > > worry people ;)
> > >
> > > 2.6 is actively maintained and will be for quite some time :)
> >
> > Any comments on this:
> > http://www.denx.de/wiki/Know/Linux24vs26
> >
> > On another denx.de page I found this summary (so you do not have to
> > visit the page):
> > # slow to build: 2.6 takes 30...40% longer to compile
> > # Big memory footprint in flash: the 2.6 compressed kernel image is
> > # 30...40% bigger
> > # Big memory footprint in RAM: the 2.6 kernel needs 30...40% more RAM;
> > # the available RAM size for applications is 700kB smaller
> > # Slow to boot: 2.6 takes 5...15% longer to boot into multi-user mode
> > # Slow to run: context switches up to 96% slower, local communication
> > # latencies up to 80% slower, file system latencies up to 76% slower,
> > # local communication bandwidth less than 50% in some cases.
> >
> > I'm merely asked because I have been pointed to this page several times
> > and I do nto have numbers for 2.4 versus 2.6.
> >
> > Note: denx does support 2.6 now.
> >
> > I do not concur and recommend 2.6 but wanted to know if anyone had more
> > insight to share.
> >
> > Sam
> > -
>
> Hi there.
>
> Since I've been dealing with those platforms quite a lot, let me have
> my $0.02.
>
> Yes 2.6 is larger than 2.4 and with small embedded processors with small
> caches & a small number of TLBs that footprint is felt quite a lot.
>
> For the 8xx which shows the biggest performance, later kernels offer
> the CONFIG_PIN_TLB option which help quite a bit.
>
> So for anything new I'd recommend 2.6 anyway, the performance delta
> is not so great as this test appears to show. I'd like this test to be performed
> again against a newer kernel version if possible.
>
> Pantelis
>
so, in the case of the big footprints, might I use a 2.4.x instead of
2.6.x just to avoid memory leaks and performance loss?
j4k3.
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