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Re: [Xen-users] Re: Serial Console Problem

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Re: Serial Console Problem
From: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>
Date: Mon, 29 Sep 2008 16:17:57 +0100
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On Sat, Sep 27, 2008 at 7:04 PM, Ferenc Wagner <wferi@xxxxxxx> wrote:
> "Andrew Lyon" <andrew.lyon@xxxxxxxxx> writes:
>> It seems that the serial console is completely dead after "Freeing
>> unused kernel memory: 208k freed"
> That's strange indeed.  What appears on the VGA console after this
> line?  (If you can scroll back via Shift+PgUp.)
>> I cannot access the sysreq commands and which I need to debug a
>> lockup problem.
> I've never managed to get the break through the hypervisor on a serial
> port.  That means no sysrq for dom0.  That and the lack of flow
> control make the Xen serial support unprofessional.  Those would be my
> wishes for 3.4... :)

Indeed mine too, I've been getting random lockups on all 3 of the
machines I've tested Xen on, with kernel 2.6.18 xensource, 2.6.21
gentoo and 2.6.25 suse, without sysrq I don't have any hope of
debugging the lockups at all and I will probably end up abandoning Xen
which will be a real shame, I really like the performance and features
and I really dont want to go back to vmware now.


>> Is there something wrong with the way I have configured the serial
>> console?
> As you can see some kernel messages, it looks like you configured the
> kernel console, contrary to what your config shows...
> --
> Regards,
> Feri.

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