Robert Milkowski wrote:
Hello Matthew,
Thursday, August 10, 2006, 6:55:41 PM, you wrote:
MA> On Thu, Aug 10, 2006 at 06:50:45PM +0200, Robert Milkowski wrote:
btw: wouldn't it be possible to write block only once (for synchronous
IO) and than just point to that block instead of copying it again?
MA> We actually do exactly that for larger (>32k) blocks.
Why such limit (32k)?
By experimentation that was the cutoff where it was found to be
more efficient. It was recently reduced from 64K with a more
efficient dmu-sync() implementaion.
Feel free to experiment with the dynamically changable tunable:
ssize_t zfs_immediate_write_sz = 32768;
--
Neil
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