2.6 kernel tuning guides

[Fraser Campbell]

Hi,

Does anyone know of a book (or howto) that offers good kernel tuning
advice, particularly things related to 2.6 though 2.4 stuff also would
be nice.

For example, some sybase tuning docs I read suggest using elvtune to
tune I/O.  elvtune manpage states "elvtune allows to tune the I/O
elevator per blockdevice queue basis" ... sounds interesting except:

  myhost:~# elvtune /dev/cciss/c0d0
  ioctl get: Invalid argument

  elvtune is only useful on older kernels;
  for 2.6 use IO scheduler sysfs tunables instead..

Hmmm, what sysfs tunables???  I can read the kernel source, and
occassionally find ideas in there but a good howto or book would go a
long way!  Hoping I don't have to write the howto ;-)

Thanks,
Fraser

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