[Qemu-block] [PATCH v3 2/3] xen-block: improve response latency

From: Tim Smith If the I/O ring is full, the guest cannot send any more requests until some responses are sent. Only sending all available responses just before checking for new work does not leave much time for the guest to supply new work, so this will cause stalls if the ring gets full. Also,

[Qemu-block] [PATCH v3 2/3] xen-block: improve response latency

From: Tim Smith If the I/O ring is full, the guest cannot send any more requests until some responses are sent. Only sending all available responses just before checking for new work does not leave much time for the guest to supply new work, so this will cause stalls if the ring gets full. Also,