Re: [Xen-devel] upgrade to 2.6.18.8 ?

["Teck Choon Giam" <giamteckchoon@xxxxxxxxx>]

On 10/3/07, Eduardo Habkost <ehabkost@xxxxxxxxxx> wrote:
> Do you have CONFIG_HIGHPTE enabled? CONFIG_HIGHPTE have caused problems
> on 2.6.20 and 2.6.21 rebases of Xen 3.1 on Fedora, on pgd_pin() and
> other page table updating hypercalls, because the kernel somehow was
> trying to map page table entries as writeable.

# grep CONFIG_HIGHPTE /boot/config-2.6.18.8-xen0
CONFIG_HIGHPTE=y

So yes it is enabled.

> 'xm dmesg' should give more information on the cause of this Oops.

Unfortunately I don't look at the xm dmesg during the Oops closely and
now the system has been running on xen-3.1.1-rc2.  I guess I will try
to reproduce and post related xm dmesg and oops message when it happen
when I have the time to test on my other test system after getting my
new RAM (waiting for 6 x 1GB RAM).

> I haven't reproduced my CONFIG_HIGHPTE problems on 2.6.18-xen-3.1.0,
> also. I don't know if it was a problem of our Xen rebase or the problem
> is present on the 2.6.18 xenbits tree.
>
> Enabling CONFIG_HIGHPTE under Xen is not recommended, anyway. Even if
> it was working, performance will probably suffer.

Ok, noted and will try on disabling CONFIG_HIGHPTE and try whether can
I reproduce the oops :)

Thanks ;)

Kindest regards,
Giam Teck Choon

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