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[Cluster-devel] Re: [Xen-devel] Announcing xen/master: pvops git trees rearranged



Am Montag, den 21.09.2009, 10:39 -0400 schrieb Konrad Rzeszutek Wilk:
> > > > title XEN pv_ops dom0 with serial console
> > > > root (hd0,1)
> > > > kernel /boot/xen.gz dom0_mem=512M loglvl=all guest_loglvl=all
> > > > com1=9600,8n1 console=com1
> > > > module /boot/bzImage-2.6.31-xen ro root=LABEL=ROOT console=ttyS0,9600n8
> > > > earlyprintk=xen 4
> 
> Do also add 'debug' in the line. That will give some more verbose output.

Will give it a try.

> > > > module /boot/initramfs-2.6.31-xen
> > > > 
> > > > That's the one i used to grab the log.
> > > > 
> > > > This is a i945 based box with an Core 2 Duo E8400 and 4GB Ram installed
> > > > but only 2912584k usable because of an PCI-Card that supports only 32bit
> > > > addressing (appropriated-ram-crap). Could this be a problem? I try to
> > > > test again with 2GB Ram installed this evening and report if it gets any
> > > > further...
> 
> If you specify 'mem=2GB' it will limit how much memory Xen and Linux see.
> But you do use 'dom0_mem' which limits the amount of memory that
> Dom0 would use for PCI drivers. So the 32-bit support shouldn't be an issue.
> 
> Looking at the serial line it also looks that your Linux is 32-bit?

Thats right (xen and dom0 are 32bit on that box so far).

> Did you try the 64-bit?

No. As i use GFS (cluster filesystem) and some hosts are 32bit only in
my little home cluster it didn't make sense so far to switch to 64bit.

Would make sense if dom0 would boot on this hosts as i could switch the
cluster-node on this box into a 32bit domU...

> > > Here are my working grub.conf entries for pv_ops dom0:
> > > 
> > > VGA text console:
> > > 
> > > title Fedora Xen pv_ops dom0-test (2.6.31-rc5)
> > >         root (hd0,0)
> > >         kernel /xen.gz dom0_mem=1024M loglvl=all guest_loglvl=all
> > >         module /vmlinuz-2.6.31-rc5 ro root=/dev/mapper/vg_dom0test-lv01
> > >         module /initrd-2.6.31-rc5.img
> > > 
> > > 
> > > Serial console:
> > > 
> > > title Fedora Xen pv_ops dom0-test (2.6.31-rc5) / serial console
> > >         root (hd0,0)
> > >         kernel /xen.gz dom0_mem=1024M loglvl=all guest_loglvl=all com1=19200,8n1 console=com1
> > >         module /vmlinuz-2.6.31-rc5 ro root=/dev/mapper/vg_dom0test-lv01 console=hvc0 earlyprintk=xen
> > >         module /initrd-2.6.31-rc5.img
> > > 
> > > When using serial console with Xen you don't need to specify serial console stuff for the dom0 kernel..
> > > Also note the 'console=hvc0' for dom0 kernel..
> > 
> > Isn't the selection of hvc0 as main console supposed to work out
> > automatically? Looks like a bug if it isn't. Anyway thanks for the hint.
> 
> Yes. As long as CONFIG_HVC_XEN is compiled in (=y).

Thanks for confirmation.

> > Will give it a try with a grub config adapted to yours later today.
> > 
> > Are there still problems related to specific CONFIG_ options which i
> > should deactivate in my build?
> 
> It should be all clear. But we haven't tested all of them, so you might be hitting
> one that hasn't been tested yet.

Thanks,


Marc


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