8.0 still doesn't boot in Xen (kern/138863)
kevin at your.org
Tue Nov 24 18:00:43 UTC 2009
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.
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