Re: How should anaconda check for PAE? (was Re: arch fun.)
Will Woods wrote: > (PAE_flag and >=4GB RAM) or (PAE_flag and vmx_flag and >=1GB RAM) > > where vmx_flag is the flag for hardware virt stuff. Is this a good test? No. > Some further questions: > - Is a PAE kernel required for proper virt support? Xen stopped supporting non-PAE (paravirt) guest kernels recently. Even before that everything ran in PAE mode because PAE was a compile time option for Xen (i.e. mixing PAE and non-PAE guests wasn't possible). So, yes, for Xen the PAE kernel is mandatory. No, the vmx bit isn't a good test, paravirtualized xen guests don't need hardware support. For kvm it doesn't matter I think. I'd say we want in any case ... (1) Install PAE kernel if there is RAM mapped above 4G. (2) Install PAE kernel if the CPU supports NX (regardless of the installed memory). I don't see the point in checking for vmx/svm. Beside that I think there is no hardware which has virtualization hardware support but hasn't nx, so the check would be superfluous anyway. We can also simply do this: - Install PAE kernel if the CPU supports PAE. i.e. make PAE the default kernel. cheers, Gerd ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: How should anaconda check for PAE? (was Re: arch fun.)
Gerd Hoffmann wrote: > We can also simply do this: > > - Install PAE kernel if the CPU supports PAE. > > i.e. make PAE the default kernel. Yes, I really think we should just do this. It's simple, it means we get the logic right for Xen as well as bare-metal (without any special cases), and the performance hit for those who have PAE and < 4GB isn't that bad, I don't think (although numbers one way or the other would be interesting to see). -- Chris Lalancette ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: How should anaconda check for PAE? (was Re: arch fun.)
On 25.02.2009 13:27, Chris Lalancette wrote: Gerd Hoffmann wrote: We can also simply do this: - Install PAE kernel if the CPU supports PAE. i.e. make PAE the default kernel. Yes, I really think we should just do this. It's simple, it means we get the logic right for Xen as well as bare-metal (without any special cases), and the performance hit for those who have PAE and < 4GB isn't that bad, I don't think (although numbers one way or the other would be interesting to see). What about compatibility problems? My old laptop had a PAE capable CPU but could not boot a PAE kernel -- I noticed when I was trying a PAE kernel for some tests two or three years ago. I asked a kernel-developer back then if it was worth reporting and I got told that such problems are not unusual and often BIOS or hardware problems. Those likely didn't vanish magically is that statement is correct. BTW, does anyone know when Windows XP SP2/Vista uses it PAE-still-limited-to-4gb-kernel to support NX? Maybe we should use a similar scheme to avoid running into hardware issues. CU knurd ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: How should anaconda check for PAE? (was Re: arch fun.)
Thorsten Leemhuis wrote: > On 25.02.2009 13:27, Chris Lalancette wrote: >> Gerd Hoffmann wrote: >>> We can also simply do this: >>> >>> - Install PAE kernel if the CPU supports PAE. >>> >>> i.e. make PAE the default kernel. >> Yes, I really think we should just do this. It's simple, it means we get the >> logic right for Xen as well as bare-metal (without any special cases), and >> the >> performance hit for those who have PAE and < 4GB isn't that bad, I don't >> think >> (although numbers one way or the other would be interesting to see). > > What about compatibility problems? My old laptop had a PAE capable CPU > but could not boot a PAE kernel -- I noticed when I was trying a PAE > kernel for some tests two or three years ago. I asked a kernel-developer > back then if it was worth reporting and I got told that such problems > are not unusual and often BIOS or hardware problems. Those likely didn't > vanish magically is that statement is correct. Hm, it's an interesting point, and not one that I've heard about or seen before. Xen in Fedora required PAE for quite some time, and despite plenty of other problems (mostly having to do with people wanting to run Xen on non-PAE platforms), we didn't hear about any of this specific problem. Doesn't mean it doesn't exist, though :). Do you have pointers to specific problems? A quick google didn't turn up anything, but I didn't try all that hard. -- Chris Lalancette ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Module request: IB700_WDT (IB700 watchdog timer)
I assume this is the right place to request drivers for the Fedora kernel? I'd like to request that the in-tree IB700 watchdog driver be enabled. The config option is IB700_WDT. My reading of the code is that it won't break anything unless users explicitly load the new module: http://lxr.linux.no/linux+v2.6.28.5/drivers/watchdog/ib700wdt.c Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones Read my OCaml programming blog: http://camltastic.blogspot.com/ Fedora now supports 68 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: Module request: IB700_WDT (IB700 watchdog timer)
On Wed, Feb 25, 2009 at 04:13:22PM +, Richard W.M. Jones wrote: > > I assume this is the right place to request drivers for the Fedora > kernel? > > I'd like to request that the in-tree IB700 watchdog driver be enabled. > The config option is IB700_WDT. looks like it already is ? $ grep IB700 config-* config-generic:CONFIG_IB700_WDT=m Dave -- http://www.codemonkey.org.uk ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: Module request: IB700_WDT (IB700 watchdog timer)
On Wed, Feb 25, 2009 at 01:19:21PM -0500, Dave Jones wrote: > On Wed, Feb 25, 2009 at 04:13:22PM +, Richard W.M. Jones wrote: > > > > I assume this is the right place to request drivers for the Fedora > > kernel? > > > > I'd like to request that the in-tree IB700 watchdog driver be enabled. > > The config option is IB700_WDT. > > looks like it already is ? > > $ grep IB700 config-* > config-generic:CONFIG_IB700_WDT=m I don't understand the way the config files get generated fully, but in current Rawhide CVS I see: $ grep IB700 config* config-generic:# CONFIG_IB700_WDT is not set config-x86-generic:CONFIG_IB700_WDT=m The driver doesn't seem to be built even on x86, eg in this build from today: http://koji.fedoraproject.org/koji/rpminfo?fileStart=1650&rpmID=1042373&fileOrder=name#filelist http://kojipkgs.fedoraproject.org/packages/kernel/2.6.29/0.153.rc6.git2.fc11/data/logs/i586/build.log Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: Module request: IB700_WDT (IB700 watchdog timer)
On Wed, Feb 25, 2009 at 07:53:08PM +, Richard W.M. Jones wrote: > On Wed, Feb 25, 2009 at 01:19:21PM -0500, Dave Jones wrote: > > On Wed, Feb 25, 2009 at 04:13:22PM +, Richard W.M. Jones wrote: > > > > > > I assume this is the right place to request drivers for the Fedora > > > kernel? > > > > > > I'd like to request that the in-tree IB700 watchdog driver be enabled. > > > The config option is IB700_WDT. > > > > looks like it already is ? > > > > $ grep IB700 config-* > > config-generic:CONFIG_IB700_WDT=m > > I don't understand the way the config files get generated fully, but > in current Rawhide CVS I see: > > $ grep IB700 config* > config-generic:# CONFIG_IB700_WDT is not set > config-x86-generic:CONFIG_IB700_WDT=m I replied to your mail before I noticed another mail that showed Kyle turned it on earlier today. He added it to config-generic, which is what my grep turned up. I moved it to x86-generic, as it seems pointless turning it on on other architectures given it's for a SBC. > The driver doesn't seem to be built even on x86, eg in this build from > today: Yeah, no builds have been done today yet. It'll be in the next one that goes out. Dave -- http://www.codemonkey.org.uk ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: Module request: IB700_WDT (IB700 watchdog timer)
On Wed, Feb 25, 2009 at 03:56:05PM -0500, Dave Jones wrote: > Yeah, no builds have been done today yet. > It'll be in the next one that goes out. Thanks! Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones Read my OCaml programming blog: http://camltastic.blogspot.com/ Fedora now supports 68 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
Re: How should anaconda check for PAE? (was Re: arch fun.)
On Wed, 25 Feb 2009 14:15:37 +0100 Thorsten Leemhuis wrote: > On 25.02.2009 13:27, Chris Lalancette wrote: > > Gerd Hoffmann wrote: > >> We can also simply do this: > >> > >> - Install PAE kernel if the CPU supports PAE. > >> > >> i.e. make PAE the default kernel. > > > > Yes, I really think we should just do this. It's simple, it means we get > > the > > logic right for Xen as well as bare-metal (without any special cases), and > > the > > performance hit for those who have PAE and < 4GB isn't that bad, I don't > > think > > (although numbers one way or the other would be interesting to see). > > What about compatibility problems? My old laptop had a PAE capable CPU > but could not boot a PAE kernel -- I noticed when I was trying a PAE > kernel for some tests two or three years ago. I asked a kernel-developer > back then if it was worth reporting and I got told that such problems > are not unusual and often BIOS or hardware problems. Those likely didn't > vanish magically is that statement is correct. > > The algorithm I posted should handle that. If you support NX or you have >4GB of memory then it's pretty much impossible for you to have one of those old CPUs. And all SVM/VMX capable machines support NX so we'd always have the right kernel for them too. ___ Fedora-kernel-list mailing list Fedora-kernel-list@redhat.com https://www.redhat.com/mailman/listinfo/fedora-kernel-list
