xm dmesg and performance on serial port

[kuas <ku4s@users.sourceforge.net>]

Hello,

I might only have configuration problem, but I couldn't find any docs 
that could relate to the problem. The command: 'xm dmesg' seems to stop 
buffering any output after a while. I have to enable serial port to get 
the output bigger than the buffer. I don't know how big the buffer or if 
it's circular? Is there anyway to fix this behavior?

The second question I have since I have to enable the serial line. 
Considering the speed of the serial line is very slow. Would that affect 
the performance of XEN than just buffering the output (for 'xm dmesg')? 
I do have to output some messages when a certain event occurs. Will 
enabling more consoles (serials, vga, tty)  slow the performance by default?

Just by reading the XEN papers, XEN has a way to register asynchronous 
events to the domains. Would it be better in terms of performance to 
send the event messages to a particular domain (e.g: Domain 0) using the 
asynchronous mechanism and have the domain kernel to handle the messages 
as XEN events.

Thanks in advance for any comments.


Kuas.


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