freebsd-nq/sys/amd64
Paul Saab c794ceb56a Implement write combining for crashdumps. This is useful when
write caching is disabled on both SCSI and IDE disks where large
memory dumps could take up to an hour to complete.

Taking an i386 scsi based system with 512MB of ram and timing (in
seconds) how long it took to complete a dump, the following results
were obtained:

Before:				After:
	WCE           TIME		WCE           TIME
	------------------		------------------
	1	141.820972		1	 15.600111
	0	797.265072		0	 65.480465

Obtained from:	Yahoo!
Reviewed by:	peter
2000-10-17 10:05:49 +00:00
..
amd64 Implement write combining for crashdumps. This is useful when 2000-10-17 10:05:49 +00:00
conf Bring the 'twe' driver back now that we think it should work. 2000-10-12 01:46:43 +00:00
include Add types and prototypes. 2000-10-16 19:49:30 +00:00
isa - Change fast interrupts on x86 to push a full interrupt frame and to 2000-10-06 02:20:21 +00:00
pci Remove debug writes introduced in prior commit 2000-10-16 07:31:13 +00:00
Makefile Update tags directive to reflect the new location of soft updates 2000-07-04 00:18:43 +00:00