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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