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[Xen-devel] xm dmesg and performance on serial port

To: xen-devel-ml <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] xm dmesg and performance on serial port
From: kuas <ku4s@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 25 Oct 2004 02:30:14 -0400
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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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