how to increase the dmesg output (lines)

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Dear All,

Whenever I type the dmesg command at the prompt after loading my driver
I am unable to see all my debug messages. I think there is a restriction
in displaying the dmesg output. 
Where can I modify to get more lines of output of the dmesg?

In vi editor I am unable to copy more than 50 lines at a time (using
yank and paste commands).
How can I increase this to more than 50 lines?

Thanks in advance.
Regards,
Srinivas G



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