[Xen-users] 4GB on HP DL380 G4 on FC5 test1

[Fraser Campbell <fraser@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

We are running FC5 test1 on some HP DL380 G4 servers with the stock xen 
and xen kernels supplied in FC5 release.
We have 2 servers, one has 6GB of RAM the other 4GB.  Both machines 
crash (lock up) on boot, I would have hoped to see 4GB of RAM and 
functional Xen in either case.  Last message I see is related to PCI 
devices, I can try to capture the exact point of crash if it's necessary 
but I'm hoping this is a known issue.
We can get the servers to boot if we limit the amount of memory that Xen 
sees (mem=3583M on the Xen command line).  The machine will crash if we 
set mem=3584M (or leave Xen to it's own devices) so it seems that 3583M 
is the absolute RAM limit.
Does anyone know why Xen will not boot with >3583M of RAM and if there 
is a workaround so that we can use 4096M in non-PAE mode?
The Xen provided by Fedora appears to be the Xen 3.0.0 release from 
December 6, 2005.  xen_caps shows xen-3.0-x86_32 so I assume PAE support 
is not enabled.
This is my grub config in case description was not clear:

    title Fedora Core (2.6.14-1.21_FC5hypervisor)
        root (hd0,0)
        kernel /xen.gz-2.6.14-1.21_FC5 mem=3583M
        module /vmlinuz-2.6.14-1.21_FC5hypervisor ro \
            root=/dev/VolGroup00/LogVol00 maxcpus=1
        module /initrd-2.6.14-1.21_FC5hypervisor.img

Thanks,
Fraser

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