K 10
svn:author
V 7
delphij
K 8
svn:date
V 27
2014-11-08T07:30:40.568272Z
K 7
svn:log
V 310
MFV r274271:

Improve zdb -b performance:

 - Reduce gethrtime() call to 1/100th of blkptr's;
 - Skip manipulating the size-ordered tree;
 - Issue more (10, previously 3) async reads;
 - Use lighter weight testing in traverse_visitbp();

Illumos issue:
    5243 zdb -b could be much faster

MFC after:	2 weeks

END