Using build 139, I'm seeing some very strange performance with pax to copy files from one ZFS filesystem to another. The truss output is as follows:
...
 0.0796 read(4, "7F E L F0201010601\0\0\0".., 131072)   = 131072
 0.0799 write(6, "7F E L F0201010601\0\0\0".., 131072)  = 131072
 0.0848 read(4, "AB *7F E \CD [ h q "11E2".., 24120)    = 24120
 0.0850 write(6, "AB *7F E \CD [ h q "11E2".., 24120)   = 24120
 8.7385 fchmod(6, 0755)                                 = 0
 8.7387 fchownat(5, "libsun_sas.so.1", 118747, 10, AT_SYMLINK_NOFOLLOW) = 0
 8.7388 fchmod(6, 0755)                                 = 0
...

Can anyone suggest some things to look at with dtrace?

Darren

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