K 10
svn:author
V 7
delphij
K 8
svn:date
V 27
2014-12-04T23:20:44.491517Z
K 7
svn:log
V 303
MFC r274276: 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

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