People rarely "tune" the kernel by recompiling it. When I say
"tune", I mean adjust the values of certain structures. Interacting with
procfs, "/proc" is generally a better method. You could of course tune the
kernel's source code and then recompile it if you wanted to, but this
generally requires more knowledge than the majority of Linux users have,
therefore it's not common. In regard to performance tuning, kernel
recompilation would most likely involve adding additional features, or
changing current implementations, through the use of patches. For example,
you might want to add a different scheduler or virtual memory
implementation.
The "echo" your describing is a very common way for adjusting
parameters, it can not add any new functionality into the kernel. When you
"echo" something, you are interacting with procfs inside the kernel.
Therefore this allows you to see the values of certain permissible
structures and possibly modify the contents. Note that files in procfs
don't really exist like other files do, it's simply a means to "peak" into
the kernel's data structures.
Regards,
John Matthews
-----Original Message-----
From: Robert Vaughn [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 08, 2002 6:08 PM
To: RedHat
Subject: Kernel Tuning: echo vs. recompiling
I'm new to performance tuning Linux. I have noticed
that a lot of Kernel modifications can be implemented
by 'echoing' the changes into /proc/sys
See the example...
These reduce the amount of work the TCP stack has to
do:
echo 0 > /proc/sys/net/ipv4/tcp_sack
echo 0 > /proc/sys/net/ipv4/tcp_timestamps
I have also heard about tuning a Kernel through
recompiling. What would the advantage be for
recompiling when there seems to be a great variety of
changes that can be simply 'echoed' in?
Thanks,
...Robert
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