OK, so I've spent a few days benchmarking. Turns out 80% of virtio_add_buf cases are uni-directional (including the always-performance-sensitive networking code), and that gets no performance penalty (though tests with real networking would be appreciated!).
I'm not reposting all the "convert driver to virtio_add_outbuf()" patches: just the scsi one which I didn't have before. I won't actually remove virtio_add_buf() until the *following* merge window, just to be sure. One annoying thing about benchmarking is that in some cases, speeding up one side can make the whole thing slower, due to more wakeups. Device-side polling techniques might be required in future to get more performance. Cheers, Rusty. _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
