
As @domenkozar noted in #10828, cache=writeback seems to do more harm than good: https://github.com/NixOS/nixpkgs/issues/10828#issuecomment-164426821 He has tested it using the openstack NixOS tests and found that cache=none significantly improves startup performance. Signed-off-by: aszlig <aszlig@redmoonstudios.org>
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