[Xen-users] Xen 64 bit questions and problems

[Stephen Yum <steveyum@xxxxxxxxxxxxxx>]

First off, here's my system:

Tyan K8WE (S2877)
2 x Dual core Opterons
2 x 300GB SATA drives in RAID1 + LVM
12GB RAM
CentOS 64-bit
Xen 64-bit

Got a bunch of problems. Compiled a dom0 using the source, set the  
dom0_mem to 64MB, wouldn't boot. Craps out saying it had run out of  
low memory. Increased it to 128MB. Then it boots, but when I try to  
create logical volumes, it kills my ssh session. Increased it yet  
again to 256MB, then LVM stuff works and finally seems operational.
I create a domU and it seems to boot fine, but it won't shut down or  
reboot!!. I have to force a shutdown from dom0, using either 'xm  
destroy' or 'xm shutdown'.
Then I try to configure the ethernet in domU - editing ifcfg-eth0 -  
and I try to restart the network using '/etc/init.d/network restart'  
and it then complains with this:
[root@arimanes ~]# /etc/init.d/network restart
Shutting down interface eth0:  execvp: Permission denied
[FAILED]
Shutting down loopback interface:  execvp: Permission denied
[FAILED]
Setting network parameters:  [  OK  ]
Bringing up loopback interface:  execvp: Permission denied
[FAILED]
Bringing up interface eth0:  execvp: Permission denied
[FAILED]

First of all, does 64 bit systems in general need much more memory  
than the 32-bit counterpart? Or is this just Xen 64-bit in  
particular? On my 32-bit system with Xen 32-bit, dom0 there is  
happily humming away with just 64MB and gives me zero problems.
Second, this system SHOULD be faster than the 32-bit system (Dell  
1850 w/ 2x dual core xeon 2.8, 2GB RAM, 2 x 73GB U320 SCSI drives),  
but it feels awfully slow. Is this a 64-bit thing or did I screw up  
bad somewhere? Is there some AMD64 optimization I should have done?
Any info on 64-bit Linux, Opterons and Xen 64 would be most  
gratefully appreciated. Thanks!
S

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