We pretend we have one head with two megabyte worth of sectors per cylinder.
The code try to access another head in what it belives to the same
physical cylinder, because it belives that it would be faster than
waiting for the next free sector under this head to come around.
Most modern drives doesn't have a "classical" geometry, and thus
we end up fooling ourselves doing the above optimization. With this
change we will fill a cylinder sequentially if we can, and thus get
much more mileage from the track-buffer/cache built into the drives.
As a result a lot of seeks to the next or previous track should be
avoided by this.
(My disk is a lot less noisy actually...)
You can still get the old behaviour, by specifying zero for the
numbers.
This will also solve the problem with newfs barfing at really big
drives.
Obtained from: adult advice from Kirk.
You will normally have to have a VLB or other 32bit IDE "controller" for
this to work.
Depending on your setup, this may gain you 20-100 % speed from your disk.
Reviewed by: phk
Submitted by: vak@cronyx.ru
have three variables:
EXEC_DEPENDS - A list of "prog:dir" pairs of other ports this
package depends on. "prog" is the name of an
executable. make will search your $PATH for it and go
into "dir" to do a "make all install" if it's not found.
LIB_DEPENDS - A list of "lib:dir" pairs of other ports this package
depends on. "lib" is the name of a shared library.
make will use "ldconfig -r" to search for the
library. Note that lib can be any regular expression,
and you need two backslashes in front of dots (.) to
supress its special meaning (e.g., use
"foo\\.2\\.:${PORTSDIR}/utils/foo" to match "libfoo.2.*").
DEPENDS - A list of other ports this package depends on being
made first. Use this for things that don't fall into
the above two categories.
DEPENDS behaves exactly like before, so old Makefiles will still work
the same. The two variables are lists of pairs as described above.
For instance, if your program depends on unzip and libjpeg.5.*, use
the following definitions:
EXEC_DEPENDS= unzip:${PORTSDIR}/archivers/unzip
LIB_DEPENDS= jpeg\\.5\\.:${PORTSDIR}/graphics/jpeg
gmake:${PORTSDIR}/utils/gmake is automatically added to EXEC_DEPENDS
if USE_GMAKE is defined.
If NO_DEPENDS is defined, the list will just be printed out one by one.
Add a missing apostrophe that suggests inverting the frequency to get
tick size. It read better before because `CLK_TCK' suggests a tick
size although it is actually a frequency.
Define CLK_TCK only if _ANSI_SOURCE is not defined.
Don't include <machine/limits.h> to get the definition of CLK_TCK.
CLK_TCK should never have been defined there, and the inclusion
polluted the namespace.
