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Switch from BFQ-v2 to BFQ-v2-r1.
Improvements: When the first new request for the active queue arrives during disk idling, the device is not immediately unplugged if this request is small. This prevents the disk to be immediately committed to serve a small request. In fact, further requests are likely to be merged to this one quickly, after which the device is unplugged by some block layer function and larger requests are dispatched. The idling timeout and the weight-raising max time have been tuned a little bit too, as detailed below. Reduced a little bit the disk idling timeout for weight-raised queues. This helps reduce latencies for applications made of several processes that do something and then pass the token to the next process. By reducing the timeout we reduce the time that may be wasted to wait for the next request of a process that has just passed the token, and hence that will not issue any new request. Reduced the weight-raising max time from 8 to 7.5 seconds: this reduces a little bit the time interval during which a just-started disk-bound process may unproperly be weight-raised.
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