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It should allow to avoid filling up the io cache with the copied data. The current behavior pushes the cached data of other process out of the memory and slows down the system as the ram gets filled up. For exemple, I use rsync without this patch, rsync use 7GB of ram and when it's finished, cache ram is always used. When I use rsync with this patch, rsync use 7GB of ram but when it's finished, cache ram is removed and avoid an unnecessary swap. Thanks. Website of the patch : http://insights.oetiker.ch/linux/fadvise/ Patch file : http://tobi.oetiker.ch/patches/rsync-3.0.9-2-fadvise.patch
Thank you for patch. It will be included into Fedora after its acceptance by uptream.
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As this patch was rejected by upstream, I am closing with wontfix status.