On Sat, 4 Jul 2009, Phil Harman wrote:
However, it seems that memory mapping is not responsible for the problem I
am seeing here. Memory mapping may make the problem seem worse, but it is
clearly not the cause.
mmap(2) is what brings ZFS files into the page cache. I think you've shown us
that once you've copied files with cp(1) - which does use mmap(2) - that
anything that uses read(2) on the same files is impacted.
The problem is observed with cpio, which does not use mmap. This is
immediately after a reboot or unmount/mount of the filesystem.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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