document how to avoid scoreboardfile

If you have to use a ScoreBoardFile then you may see improved speed by

placing it on a RAM disk.  But be careful that you heed the same warnings

about log file placement and

<a href="../misc/security_tips.html">security</a>.

<a href="../misc/security_tips.html">security</a>.<p>

Apache 1.2 and above:<p>

Linux 2.x users should consider defining <code>Rules LINUX_TWEAK=yes</code>

in the <code>Configuration</code> file which will cause the server to

use shared memory instead of a scoreboard file.  This is known to cause

compilation problems with some distributions and kernels, so we have not

enabled it by default.  (Patches to conditionally determine the ability

to set this option are quite welcome.)<p>

SVR4 users should consider adding <code>-DHAVE_SHMGET</code> to the

<code>EXTRA_CFLAGS</code> in your <code>Configuration</code>.  This

is believed to work, but we were unable to test it in time for 1.2

release.<p>

<p><hr>