[Xen-users] XWindows locks on Xen 3.0 and IRQ 16 gets disabled

[Mike Lee <mlee@xxxxxxxxx>]

Hello All,

   I am new to the Xen scene but an experienced Linux user.  Today I 
downloaded and installed the tarballed version of Xen 3.0 on my Dell 
PowerEdge 2850 server (1x3.4GHz x86_64 proc, 4GB RAM, 700GB storage).  I 
successfully made my initrd image from the 2.6.12.6-xen (not xen0) libs 
and booted up. However, now that I have modified the grub.conf file and 
specified the dom0_mem for the master domain and rebooted, Xwindows 
hangs when it (Xwindows) tries to start up.  If I leave the dom0_mem 
setting out of my grub.conf file, everything works fine, but now I can't 
allocate memory to my slave OSs.  Any thoughts.  FYI; I did see on the 
FAQ that this could be caused by agpart, but it was refering to the 2.x 
series of Xen.
   Also, after approx. 20 mins. after running the Xen0 master kernel, 
the system logger says that it is disabling IRQ 16.  Any thoughts as to 
why?  Below I have both my grub.conf file and the entries in my 
/var/log/messages file (regarding the IRQ16 disabling).
   Thanks in advance.

Mike Lee

Below is my /etc/grub.conf config:

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Xen 3.0 / XenLinux 2.6
       root (hd0,0)
       kernel /xen-3.0.gz dom0_mem=512M console=vga
       module /vmlinuz-2.6-xen root=/dev/VolGroup00/LogVol00 ro rhgb 
quiet console=tty0
       module /initrd-2.6-xen.img
title CentOS (2.6.9-22.0.2.106.unsupportedsmp)
       root (hd0,0)
       kernel /vmlinuz-2.6.9-22.0.2.106.unsupportedsmp ro 
root=/dev/VolGroup00/LogVol00 rhgb quiet
       initrd /initrd-2.6.9-22.0.2.106.unsupportedsmp.img
title CentOS (2.6.9-22.0.2.106.unsupported)
       root (hd0,0)
       kernel /vmlinuz-2.6.9-22.0.2.106.unsupported ro 
root=/dev/VolGroup00/LogVol00 rhgb quiet
       initrd /initrd-2.6.9-22.0.2.106.unsupported.img
title CentOS-4 x86_64 (2.6.9-22.ELsmp)
       root (hd0,0)
       kernel /vmlinuz-2.6.9-22.ELsmp ro root=/dev/VolGroup00/LogVol00 
rhgb quiet
       initrd /initrd-2.6.9-22.ELsmp.img
title CentOS-4 x86_64-up (2.6.9-22.EL)
       root (hd0,0)
       kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol00 
rhgb quiet
       initrd /initrd-2.6.9-22.EL.img


Below is my messages log entry when IRQ 16 is disabled:

Feb 15 16:25:57 nmg-xen-master kernel: irq 16: nobody cared!
Feb 15 16:25:57 nmg-xen-master kernel:
Feb 15 16:25:57 nmg-xen-master kernel: Call 
Trace:<ffffffff801560e0>{__report_bad_irq+48} 
<ffffffff801561b9>{note_interrupt+
89}
Feb 15 16:25:57 nmg-xen-master kernel:        
<ffffffff801559ec>{__do_IRQ+252} <ffffffff80116d14>{do_IRQ+52}
Feb 15 16:25:57 nmg-xen-master kernel:        
<ffffffff8010eb65>{evtchn_do_upcall+197} 
<ffffffff80113aa9>{do_hypervisor_call
back+17}
Feb 15 16:25:57 nmg-xen-master kernel:        
<ffffffff8010d0ca>{hypercall_page+202} 
<ffffffff8010d0ca>{hypercall_page+202}
Feb 15 16:25:57 nmg-xen-master kernel:        
<ffffffff80111178>{xen_idle+104} <ffffffff801111ca>{cpu_idle+58}
Feb 15 16:25:57 nmg-xen-master kernel:
Feb 15 16:25:57 nmg-xen-master kernel: handlers:
Feb 15 16:25:57 nmg-xen-master kernel: [<ffffffff802a37f0>] 
(usb_hcd_irq+0x0/0x70)
Feb 15 16:25:57 nmg-xen-master kernel: Disabling IRQ #16

Attachment: mlee.vcf
Description: Vcard

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