8.0 still doesn't boot in Xen (kern/138863)
Kevin
Is it too late in the 8.0 release schedule to look at kern/138863?
Between 7.x and 8.0 the kernel can no longer boot under Xen due to
changes involving CLFLUSH. The effect is a crash very early in the
boot, with no workaround. (This is under Xen's fully virtualized mode,
not the XEN platform port underway.)
This was also mentioned on the Xen mailing lists back in September (http://lists.freebsd.org/pipermail/freebsd-xen/2009-September/000310.html
) but nothing has been committed to fix this yet.
XenServer is getting pretty popular in some enterprise and hosting
environments, so having 8.0 not bootable would be a bit
disappointing. :)
-- Kevin
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Kevin
On Nov 24, 2009, at 11:45 AM, Outback Dingo wrote:
> odd are you sure Ive got 8.0RC2 running under XEN Cloud Platform
> right now as we speak
8.0-RC3 is still exhibiting this problem on my XenServer 5.5.0 install.
Kevin
On Nov 24, 2009, at 11:20 AM, Kevin wrote:
>
> Is it too late in the 8.0 release schedule to look at kern/138863?
> Between 7.x and 8.0 the kernel can no longer boot under Xen due to
> changes involving CLFLUSH. The effect is a crash very early in the
> boot, with no workaround. (This is under Xen's fully virtualized
> mode, not the XEN platform port underway.)
>
> This was also mentioned on the Xen mailing lists back in September (http://lists.freebsd.org/pipermail/freebsd-xen/2009-September/000310.html
> ) but nothing has been committed to fix this yet.
>
> XenServer is getting pretty popular in some enterprise and hosting
> environments, so having 8.0 not bootable would be a bit
> disappointing. :)
I was just pointed to the change from a couple of days ago, adding the
tunable "hw.clflush_disable". This looks like it might do what I need,
so I'm building a new bootable CD to find out and update the PR.
This should probably be documented somewhere, just so someone in a
similar situation even knows about this tunable.
Outback Dingo
works ok
Kevin
On Nov 24, 2009, at 12:00 PM, Kevin wrote:
>
> On Nov 24, 2009, at 11:20 AM, Kevin wrote:
>
>>
>> Is it too late in the 8.0 release schedule to look at kern/138863?
>> Between 7.x and 8.0 the kernel can no longer boot under Xen due to
>> changes involving CLFLUSH. The effect is a crash very early in the
>> boot, with no workaround. (This is under Xen's fully virtualized
>> mode, not the XEN platform port underway.)
>>
>> This was also mentioned on the Xen mailing lists back in September (http://lists.freebsd.org/pipermail/freebsd-xen/2009-September/000310.html
>> ) but nothing has been committed to fix this yet.
>>
>> XenServer is getting pretty popular in some enterprise and hosting
>> environments, so having 8.0 not bootable would be a bit
>> disappointing. :)
>
> I was just pointed to the change from a couple of days ago, adding
> the tunable "hw.clflush_disable". This looks like it might do what I
> need, so I'm building a new bootable CD to find out and update the PR.
>
> This should probably be documented somewhere, just so someone in a
> similar situation even knows about this tunable.
>
> -- Kevin
Just to follow up, 8.0-RELEASE still doesn't boot for me on XenServer
5.5.0 on an AMD CPU.
Without setting hw.clflush_disable, I get the same panic as before
mentioned in the PR. If I do set clflush_disable, I get an endless
stream of Trap 12 messages, giving instruction pointers all over the
place.
The last time 8.0 was bootable was in the -BETA timeframe. Does anyone
have any other suggestions on where to look? It still works fine on
the same software using an Intel CPU, so somehow that's significant.