On Wed, Aug 10, 2005 at 10:03:31AM -0400, Andres Salomon wrote: > On Wed, Aug 10, 2005 at 11:57:35AM +0900, Horms wrote: > > On Tue, Aug 09, 2005 at 05:34:33PM -0600, dann frazier wrote: > > > On Tue, 2005-08-09 at 11:29 +0200, Christian Hammers wrote: > > > > Hello > > > > > > > > The problems is not Dell PowerEdge specific. My TYAN Tiger-i7320-S5350 > > > > (standard dual xeon server from www.ipc2u.com) also reports only 3.5GB > > > > after booting the Sarge 2.6 kernel :-( The BIOS reports full 4GB. > > > > So if it does not hurt anybody I suggest turning on 64GB support. > > > > > > >From arch/i386/Kconfig: > > > > > > If more than 4 Gigabytes is used then answer "64GB" here. This > > > selection turns Intel PAE (Physical Address Extension) mode on. > > > PAE implements 3-level paging on IA32 processors. PAE is fully > > > supported by Linux, PAE mode is implemented on all recent Intel > > > processors (Pentium Pro and better). NOTE: If you say "64GB" here, > > > then the kernel will not boot on CPUs that don't support PAE! > > > > > > So it looks like this would hurt other users. And, on machines that do > > > support PAE, I've seen benchmarks that demonstrate a significant > > > performance loss. However, this was on a 2.4.25 kernel, not a recent > > > 2.6, and I no longer have a link to those results - google might. > > > > > > I think supporting these machines would mean adding an additional x86 > > > kernel-image flavor. > > > > I think if it is a performance hit (on a sufficiently prevalent > > set of hardware) then a new flavour would be in order. > > > > On the machines not booting front, it seems those machines > > are probably going to be using the 383 or 586 flavours rather > > than the 686 flavour, so adding this option to the latter > > shouldn't cause those machines to stop booting. > > > > I can't say I'm a fan of adding another flavour. How many people are > actually using >4GB of memory on x86? I suspect (or hope) that people > who are going to be doing those sorts of things will be using x86_64 > and ia64 hardware. Christian's problem, aiui, is simply that the kernel > sees 3.5GB instead of 4GB. I'm not sure whether this is by design, or is > a bug, but I'd much rather see that fixed instead.
I am with Andress. Adding a new flavour is very heavy. -- Horms -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
