A tar pipeline still provides terrible file copy performance. Read
bandwidth is only 26 MB. So I stopped the tar copy and re-tried the
cpio copy.
A second copy with the cpio results in a read/write data rate of only
54.9 MB/s (vs the just experienced 132 MB/s). Performance is reduced
by more than half. Based on yesterday's experience, that may diminish
to only 33 MB/s.
The amount of data being copied is much larger than any cache yet
somehow reading a file a second time is less than 1/2 as fast.
This brings me to the absurd conclusion that the system must be
rebooted immediately prior to each use.
/etc/system tunables are currently:
set zfs:zfs_arc_max = 0x280000000
set zfs:zfs_write_limit_override = 0xea600000
set zfs:zfs_vdev_max_pending = 5
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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