Xen devel - Mar 2006 - xen hg tree from yesterday hangs, when kernel console is directed to ttyS0

Hi,

I am having the following setup:

the kernel displays its messages to vga and to ttyS0. This works without xen.

When I reboot my system with xen with the following options to xen and vmlinuz,

xen.gz com1=115200,8n1 console=com1,vga
vmlinuz console=ttyS0,115200 console=tty0

the system hangs up while booting the dom0 kernel.

Has anyone such a setup working? The thin is, I want a console on VGA and one on
a serial line. And both should display all messages.

Johnny

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On 16 Mar 2006, at 19:54, Hans-Christian Armingeon wrote:
> When I reboot my system with xen with the following options to xen and 
> vmlinuz,
>
> xen.gz com1=115200,8n1 console=com1,vga
> vmlinuz console=ttyS0,115200 console=tty0
>
> the system hangs up while booting the dom0 kernel.
>
> Has anyone such a setup working? The thin is, I want a console on VGA 
> and one on a serial line. And both should display all messages.
How does it ''hang''? You should be able to get initial boot
messages out
on both, although when user space starts I think one will end up being 
preferred over the other.

  -- Keir


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On Thu, 16 Mar 2006, Hans-Christian Armingeon wrote:
> When I reboot my system with xen with the following options to xen
> and vmlinuz,
>
> xen.gz com1=115200,8n1 console=com1,vga
> vmlinuz console=ttyS0,115200 console=tty0
>
> the system hangs up while booting the dom0 kernel.
I think Xen has a major buffering/blocking IO issue with serial
console. It works for a while but when loads of lines get
flooded onto the console, the system freezes up. Adding a
"sync_console" to your Xen parameters might solve the problem, or at
least it worked for me.

-- 
Jussi Hämäläinen         +358 3 3551 8086   University of Tampere
System administrator     +358 50  5900641   Computer Centre
ccjuha@uta.fi            TietoPinni  4166   http://www.uta.fi/laitokset/tkk

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On 19 Mar 2006, at 15:10, Jussi Hamalainen wrote:
>> When I reboot my system with xen with the following options to xen
>> and vmlinuz,
>>
>> xen.gz com1=115200,8n1 console=com1,vga
>> vmlinuz console=ttyS0,115200 console=tty0
>>
>> the system hangs up while booting the dom0 kernel.
>
> I think Xen has a major buffering/blocking IO issue with serial
> console. It works for a while but when loads of lines get
> flooded onto the console, the system freezes up. Adding a
> "sync_console" to your Xen parameters might solve the problem, or
at
> least it worked for me.
Maybe it''s hardware specific. I can echo a long string to the serial 
console in a tight loop from dom0 shell and I see no problems. My setup 
is similar to the OP''s (115200 baud).

  -- Keir


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