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"realKano@directbox.com" 06-16-2008 12:02 PM

2.6.26 issues
 
Some issues with current snapshot:

a) DVB modules got accidently disabled, please reenable em - you see this in config:

# CONFIG_DVB_CORE is not set

b) A new ALSA sound driver interferes with DVB driver.

Please disable this:

CONFIG_SND_AW2=m

or at least blacklist it:

blacklist snd-aw2

I don't think that anybody will miss this driver, it was never here before, it only caues problems with saa7146 cards (take a look at budget-av to see that it uses the same pci id just in general form).

c) XEN

Is it really needed to enable XEN by default? I don't know of any working XEN patch for nvidia 173.x drivers which would allow compilation - without it should be possible (until 171.x you might be able to patch the driver, official 2.6.26 patches are only for 173.x drivers out).

d) HIGHMEM64GB

As there are lots of users with 4GB and more maybe think about enabling this by default.


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Ben Collins 06-16-2008 02:42 PM

2.6.26 issues
 
On Mon, 2008-06-16 at 15:02 +0000, realKano@directbox.com wrote:
> Some issues with current snapshot:
>
> a) DVB modules got accidently disabled, please reenable em - you see this in config:
>
> # CONFIG_DVB_CORE is not set

Good catch, thanks.

> b) A new ALSA sound driver interferes with DVB driver.
>
> Please disable this:
>
> CONFIG_SND_AW2=m
>
> or at least blacklist it:
>
> blacklist snd-aw2
>
> I don't think that anybody will miss this driver, it was never here before, it only caues problems with saa7146 cards (take a look at budget-av to see that it uses the same pci id just in general form).

Thanks. We'll blacklist this, since we want the driver available (easier
for people to edit a file than to compile the module themselves).

> c) XEN
>
> Is it really needed to enable XEN by default? I don't know of any working XEN patch for nvidia 173.x drivers which would allow compilation - without it should be possible (until 171.x you might be able to patch the driver, official 2.6.26 patches are only for 173.x drivers out).

Yes, it is needed. We have lguest, VMI paravirt and xen paravirt enabled
by default. We hope that nvidia can provide patches (or we can help to
create patches) to get this working better. We've set a precedent in the
past, that we wont disable features in our kernels, reducing it's
usefulness, just because a proprietary driver conflicts with it. We
still hold to this.

> d) HIGHMEM64GB
>
> As there are lots of users with 4GB and more maybe think about enabling this by default.

We only had this enabled on i386-server before. People have always
needed 64-bit for desktop to use > 4G of mem. We've disabled it on the
32-bit server kernel now, since it keeps a lot of things (that are of
particular interest to server installs) from working:

* lguest : Server is a popular install for kvm guests
* dma engines : Server's quite often want to take advantage of enhanced
dma hardware


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Soren Hansen 06-20-2008 08:57 AM

2.6.26 issues
 
On Mon, Jun 16, 2008 at 10:42:40AM -0400, Ben Collins wrote:
>> d) HIGHMEM64GB
> >
> > As there are lots of users with 4GB and more maybe think about enabling this by default.
> We only had this enabled on i386-server before. People have always
> needed 64-bit for desktop to use > 4G of mem. We've disabled it on the
> 32-bit server kernel now, since it keeps a lot of things (that are of
> particular interest to server installs) from working:
>
> * lguest : Server is a popular install for kvm guests

I feel I should clarify some things here. CONFIG_LGUEST enables a
paravirt hypervisor in the linux kernel, which is completely unrelated
to kvm. virtio (some of the paravirt stuff that kvm guests can make use
of) has close connections to lguest, but the lguest hypervisor is not
needed for anything that involves kvm.

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Ben Collins 06-20-2008 02:08 PM

2.6.26 issues
 
On Fri, 2008-06-20 at 10:57 +0200, Soren Hansen wrote:
> On Mon, Jun 16, 2008 at 10:42:40AM -0400, Ben Collins wrote:
> >> d) HIGHMEM64GB
> > >
> > > As there are lots of users with 4GB and more maybe think about enabling this by default.
> > We only had this enabled on i386-server before. People have always
> > needed 64-bit for desktop to use > 4G of mem. We've disabled it on the
> > 32-bit server kernel now, since it keeps a lot of things (that are of
> > particular interest to server installs) from working:
> >
> > * lguest : Server is a popular install for kvm guests
>
> I feel I should clarify some things here. CONFIG_LGUEST enables a
> paravirt hypervisor in the linux kernel, which is completely unrelated
> to kvm. virtio (some of the paravirt stuff that kvm guests can make use
> of) has close connections to lguest, but the lguest hypervisor is not
> needed for anything that involves kvm.

So do we need lguest or not?


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Soren Hansen 06-20-2008 03:00 PM

2.6.26 issues
 
On Fri, Jun 20, 2008 at 10:08:13AM -0400, Ben Collins wrote:
> > > * lguest : Server is a popular install for kvm guests
> > I feel I should clarify some things here. CONFIG_LGUEST enables a
> > paravirt hypervisor in the linux kernel, which is completely
> > unrelated to kvm. virtio (some of the paravirt stuff that kvm guests
> > can make use of) has close connections to lguest, but the lguest
> > hypervisor is not needed for anything that involves kvm.
> So do we need lguest or not?

Well, we don't *need* it, no. It's somewhat convenient that I don't have
to compile my own kernel to toy around with it, but if it's limiting for
you to have it enabled, then feel free to disable it. I can't imagine
anyone would even notice.

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Virtualisation specialist | Ubuntu Server Team
Canonical Ltd. | http://www.ubuntu.com/
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Ben Collins 06-20-2008 03:15 PM

2.6.26 issues
 
On Fri, 2008-06-20 at 17:00 +0200, Soren Hansen wrote:
> On Fri, Jun 20, 2008 at 10:08:13AM -0400, Ben Collins wrote:
> > > > * lguest : Server is a popular install for kvm guests
> > > I feel I should clarify some things here. CONFIG_LGUEST enables a
> > > paravirt hypervisor in the linux kernel, which is completely
> > > unrelated to kvm. virtio (some of the paravirt stuff that kvm guests
> > > can make use of) has close connections to lguest, but the lguest
> > > hypervisor is not needed for anything that involves kvm.
> > So do we need lguest or not?
>
> Well, we don't *need* it, no. It's somewhat convenient that I don't have
> to compile my own kernel to toy around with it, but if it's limiting for
> you to have it enabled, then feel free to disable it. I can't imagine
> anyone would even notice.

If it's not hurting anything, then I'm fine with it there.


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