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Re: [Xen-devel] A weird behavior of xenconsole on XEN/IA64

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Subject: Re: [Xen-devel] A weird behavior of xenconsole on XEN/IA64
From: Anthony Liguori <aliguori@xxxxxxxxxx>
Date: Thu, 15 Sep 2005 09:49:08 -0500
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Tian, Kevin wrote:

I'm not sure I fully understand, you're hitting Ctrl + ] and it's not
taking you out of the console?

No, Ctrl+] can take me out of the console. What I mean is, when domU
boots to place around ACPI init, there's no console output then. Then I
started to log on/off the console several times. However the first two
"xm console 1" got no output at all. Only the third "xm console 1" can
make domU continue to boot and output. If without the third, domU also
halt there and the xenconsole page also shows no updated content.
Ah, okay, sorry I'm still a bit groggy :-)

Sounds like event channel notifications aren't happening. Upon startup, the console client will check the console ring. Otherwise, it will just wait for an event channel notification.

If you're not seeing data unless you reconnect to the console, it's likely because that notification isn't being triggered (for whatever reason).

Hope this helps,

Anthony Liguori

Thanks,
Kevin
That code is in the client (tools/console/client/main.c) and hasn't
really changed.  Maybe Ctrl + ] generates a different scancode on your
system?

Regards,

Anthony Liguori

Exactly at third "xm console 1", the subsequent messages continues to
show. Seems like this is not delayed message because domU's progress
seems also halt for same long period and then continue to boot.

Definitely I don't want to confuse anybody here, and it's very likely
to
be an XEN/IA64 specific issue (out of sync for some time). I post it
here just in case any guys familiar with this part can point me some
possible clues about normal work flow of xenconsole, which then can
help
me to find root cause. ;-)

Actually some time later, wait_for_blkif in blkfront also warns
"timeout
to connect to device". Though there may be other reasons for the
connection, I'm also interested whether the reason for incontinuous
console message also relates to this one.

Is it possible from the lock of xenbus? One background is, xenstore
has
already been setup correctly, and I can see some transaction succeeded
on that page.

Appreciate your comments.

Thanks,
Kevin

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