Implemented snd_pcm_sw_params_set_start_threshold() and snd_pcm_sw_params_set_avail_min() in the ALSA 0.9 driver.
This doesn't actually change any latency for me, but it's the right thing to do...

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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401556