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bbfa235
(Get the code!)
I've installed the -proposed kernel and ran 10 iterations of a block write soak test using stress-ng and measured the duration to perform 200000 I/O operations:
3.11.0-13-generic #20-Ubuntu : 127.6 seconds
3.11.0-14-generic #21-Ubuntu (-proposed): 78.5 seconds
so the proposed kernel does radically improve block I/O write performance as expected.
I have also thrashed ext4 with multiple kernel builds for a few hours and ext4 performs without any observable faults. I deem this verified and passed.