rsync - Sep 2009 - Disable checksumming to improve local performance?

Is it possible to disable checksumming?  I'm using rsync with -W,  
whole file, so if a file has changed I don't want to just transfer the  
changes.  The source and destination or local filesystems.
I've noticed that performance in 3.0.6 is slower than 2.6.9.  3.0.6 is  
at ~90MB/sec and 2.6.9 is at ~107MB/sec.   I'm looking for anything  
that can help to improve transfer rates on large files.

thanks,
Greg

On Fri, Sep 04, 2009 at 10:26:43AM -0700, Greg Siekas
wrote:
> Is it possible to disable checksumming?  I'm using rsync with -W,
> whole file, so if a file has changed I don't want to just transfer
> the changes.
There is not currently a way to do that.  I whipped up the appended
patch that makes -WW disable full-file checksum computation and makes
that the default for a local transfer.  When comparing -W vs -WW in some
local-transfer testing, it didn't result in any perceivable difference
in transfer speed or runtime.  You can verify that it is enabled by
using --out-format='%i %C %n%L' and noting that all the checksums turn
into all-bits-on values (the checksum bytes are still transmitted so
that a read-error on the sending side can be indicated to the receiver).

..wayne..
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