max size of /dev/xconsole?

[Xan <dxpublica@telefonica.net>]

Hi,

I'm a user of NSLU2. I installed debian and upgrade to squeeze. Well, ...
In rsyslog.conf I have the line:

*.*                     /dev/xconsole

Now I can read all the successes with
cat /dev/xconsole

The trouble I have is what is the _max_ size /dev/xconsole could have? 
I'm thinking about tons of lines before I read it (with cat 
/dev/xconsole, xconsole is clear !?). Is there any way for specifying 
the max size of this device?

Thanks in advance,
Xan.