FWIW, the benefit, probably comes from the read-file, as the written file
is written with DIRECT I/O and I can't see that it should make a difference
there.
Another thing I noted -- when xfs_fsr _exits_, ALL of the space it had used
for file cache read into memory -- gets freed - whereas before, it just stayed in
the buffer cache and didn't get released until the space was needed.
Linda Walsh wrote:
I wondered why it lumped all this memory reclaiming and thought to try
using
the posix_fadvise calls in xfs_fsr to tell the kernel what data was
unneeded
and such...
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