Lubos Lunak wrote:

> On Friday 24 of September 2004 09:46, Karl Vogel wrote:
>> BTW: you can look at the I/O patterns by setting /proc/sys/vm/block_dump
>> to 1. Then each physical disk I/O will be logged to the kernel log.
> 
>  Interesting, but how is one actually supposed to use it? Kernel log is
>  saved
> to /var/log/messages, so if I turn it on, the log is full of messages
> about saving the messages.

kill klogd/syslogd and then use dmesg to view the entries. (use option -s
with sufficiently large size).

It's an option of the kernel laptop mode, so that you can find out which
application spun up the harddrive again. More info can be found in the
kernel sources file Documentation/laptop-mode.txt


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