**UNIX is a registered trademark of AT&T in the US and other countries.
**One might seriously ask the question what good it is if ``only''
one subsystem within the kernel hangs if it is something like the
network on a diskless workstation.
**To understand why this number is ![[equation]](https://docs.freebsd.org/44doc/papers/kernmalloc-4.gif)
one
observes that the power-of-two algorithm yields sizes of 1, 2, 4, 8, ...
pages while the large block algorithm that allocates in multiples
of pages yields sizes of 1, 2, 3, 4, ... pages.
Thus for allocations of sizes between one and two pages
both algorithms use two pages;
it is not until allocations of sizes between two and three pages
that a difference emerges where the power-of-two algorithm will use
four pages while the large block algorithm will use three pages.