zfs code - Aug 2008 - Review for 6729208 Optimize macros in sys/byteorder.h (due Sept. 3)

Here''s some performance results running " find . -exec ls -l"
on separate ZFS filesystems created on x86 and sparc and imported/exported to
amd64, em64t, and sun4u platforms.  This shows performance gain from optimized
byteorder.h macros.

		Percent savings, real time
		ZFS filesystem created originally on:
Platform	x86	sparc
amd64		4%	3%
em64t		3%	4%
sun4u		4%	2%

Environment:
* Create 2 separate ZFS filesystems with 1024 directories, each with 32 files,
are on x86 and sparc and zpool export/import to the other systems.
* Run this command on ZFS filesystem:  find . -exec ls -l {} \; >/dev/null
* Run using NV97 with and without fix to RFE 6729208 (byteorder.h macro
optimization)

BTW, I still could use some code review comments:
http://dan.drydog.com/reviews/6729208-bswap3/
--
This messages posted from opensolaris.org

How do we get 4% faster when running on the same endianness as the fs was 
created on?  (created on x86, run on amd64)  Where are the bulk of the calls 
to BSWAP_* happening in that case?

--matt

Dan Anderson wrote:
> Here''s some performance results running " find . -exec ls
-l" on separate ZFS filesystems created on x86 and sparc and
imported/exported to amd64, em64t, and sun4u platforms.  This shows performance
gain from optimized byteorder.h macros.
> 
> 		Percent savings, real time
> 		ZFS filesystem created originally on:
> Platform	x86	sparc
> amd64		4%	3%
> em64t		3%	4%
> sun4u		4%	2%
> 
> Environment:
> * Create 2 separate ZFS filesystems with 1024 directories, each with 32
files,
> are on x86 and sparc and zpool export/import to the other systems.
> * Run this command on ZFS filesystem:  find . -exec ls -l {} \;
>/dev/null
> * Run using NV97 with and without fix to RFE 6729208 (byteorder.h macro
optimization)
> 
> BTW, I still could use some code review comments:
> http://dan.drydog.com/reviews/6729208-bswap3/
> --
> This messages posted from opensolaris.org
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