AMD64 - going from 2.6 back to 2.4

[JB]

Got Gentoo up and running smoothly on a dual Opteron box, it takes all the pounding that the ingeneers here can throw at it, but am now stuck with a problem.
An application will not run on 2.6 kernels.

So my quiestions are:

Which 2.4 kernel should I use for AMD64? Patches?

I am also worried that there might be some problems as everything on the system was done with a 2.6 kernel from the start. Does anyone know if there will be any surprises, say with the file systems or such?

Thanks all.

PS: My appologies if there is already such a topic,

LaNcom · Posted: Thu Feb 05, 2004 2:18 pm Post subject:

The problem is, kernel 2.4.x is deprecated on AMD64...
What app doesn't work? Did you try 2.6.2, it fixes a lot of the incompatibility introduced with 2.6?

Kioshen · Posted: Thu Feb 05, 2004 8:55 pm Post subject:

What application is not running on the 2.6 ? Does it need a particular module or something ? Right now 2.4 is deprecated because all of the patches are applied to the gentoo-dev-sources for a reason since it's still in a beta stage. Are you using the latest gentoo-dev-kernel ?

Maybe try deactivating ntpl in the kernel. I know you'll suffer from a performance loss but it might help. Some apps written for 2.4 don't like ntpl (mostly commercial software certified for a particular distro).

By the way you could use a 2.4 kernel. The only thing is that you would have to hunt all of the amd64 patches by yourself and apply them manually. That's the inconveniance or use RH,Suse or MDK solutions ... I know it's really expensive but they are using 2.4 kernels if I remember it correctly.

Maybe naming the application would help us help you way better than just "an application that doesn't work with 2.6".

[JB] · Posted: Fri Feb 06, 2004 8:31 am Post subject:

Kioshen · Posted: Fri Feb 06, 2004 5:56 pm Post subject:

You should check this page :

http://www.magma-da.com/c/@OnQqEF9CQ_wfc/Pages/OSRequirements.html

There is an interesting bit of info about how to make it work with RHE. It is missing this service and env var. :

[JB] · Posted: Mon Feb 09, 2004 11:59 am Post subject:

I believe the line LD_ASSUME_KERNEL="2.4.1" is there to tell Magma you're running kernel 2.4.1, so that doesn't help.

Kioshen · Posted: Mon Feb 09, 2004 2:41 pm Post subject:

Yes it could work since the application is assuming that it's running a specific kernel. You just fool the application. It could work. Did you even try it out, it won't break anything it's just a temporary variable. If it doesn't work you could say to me "I told ya" but try it out nevertheless.

As for ntpl, just deactivate preemption in the kernel and it should be enough. If not add -ntpl to your kernel boot line in grub or lilo.

[JB] · Posted: Mon Feb 09, 2004 4:04 pm Post subject: