Re: [Xen-users] New to Xen

[Niels Dettenbach <nd@xxxxxxxxxxxx>]

Am Freitag, 11. November 2011, 13:59:53 schrieb J. Roeleveld:
> I have seperate configs for the different domUs. (They don't all do the
> same things and prefer to only enable what is really needed)
Yes, makes much sense in production...

> > CONFIG_XEN_BACKEND=y
> > CONFIG_XEN_BLKDEV_BACKEND=y
> > CONFIG_XEN_BLKDEV_TAP=y
> 
> Is this one necessary when using LVM LVs for the partitions?
TAP is for file based disks only - BLKDEV_BACKEND should be required if want 
to use LVM (phy).

> > CONFIG_XEN_NETDEV_TX_SHIFT=8
> 
> Not seen this one yet (or missed it). Guess I've got some reading/googling
> to do.
This is not completely clear to me and i would not put my hand in any fire for 
it... I assume it relys to any kind of buffer / mapping within the network 
stuff.

In openSuSe (just read that) these value seems changed to 10, others use 12 
here - i just left the default for now as initially recommended by the 
regarding xen code / patch writer. 

I still have some strange TCP / networking problems with some older DomUs 
after upgrading to 4.1.2 (from 3.4.3) - this may or may not related to this 
setting.
 

> > CONFIG_XEN_PCIDEV_BACKEND=y
> > CONFIG_XEN_PCIDEV_BACKEND_VPCI=y
> 
> Only when passing PCI-devices to domUs, right? :)
Yes, but did not worked with it yet (lack of time)...

> > CONFIG_XEN_TPMDEV_BACKEND=m
> > CONFIG_XEN_SCSI_BACKEND=y
> > CONFIG_XEN_USB_BACKEND=m
> 
> These three, only when passing the devices to the domU?
Yes...

> > CONFIG_XEN_NETDEV_ACCEL_SFC_FRONTEND=m
> 
> Need to read up on this, name sounds interesting.
...afair that only affects special network accel hardware (Solarflare NICs).


> > Yes (in Dom0).
> 
> Ok, the documentation I found was contradictory on this point.
> What I found seemed to indicate that xl doesn't use xend and will work
> without xend running.
> But when using xm, xend is needed.
Ok, right, my fault...
this is new to me (work with 4.x just since some days now...). 

As i just have some own older scriptwork relying on xm i need this at least 
until i've ported them... If you work just with the new xl toolchain you did 
not require xend any longer...Thanks for pointing me here...


cheers,


Niels.

-- 
---
Niels Dettenbach
Syndicat IT&Internet
http://www.syndicat.com/

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