Gentoo has no gzip --rsyncable. Please make this feature configurable.
Also, gzip is not the best choice for SMP machines. As we are unable to use --rsyncable, it's better to use pbzip2. Now i've just changed source codes and GZIP value, but, probably, it would be better to move rsyncable switch to variable itself (?) and rename it to archiver?
P.S. Disabling compression at all maybe not a choice in some cases.
(from redmine: created on 2010-06-04, closed on 2010-06-14)