On Fri, May 29, 2015 at 01:42:26PM +0900, Tetsuya Mukawa wrote: > - Change user interface to be able to specify each feature by name.
I disagree with this change, the uint64_t backend_features option was better because: The text options will just result in a very long command-line that is hard to read for humans. Instead of checking a bit in a single hex number, you have to scan over long comma-separated text options which can be in any arbitrary order to find the feature bit you were looking for. This option needs to be scripted or generated by a management tool anyway since it depends on the vhost-user backend program that is being paired with QEMU. The number of human users constructing these option is extremely low - if they use it they'll copy-paste it from their vhost-user program's documentation so the contents don't matter much (shorter is better though). The text options must be updated when new feature bits are added to virtio-net. For these reasons I find the numeric backend_features option better.
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