lower buffer size to 20k in client
lower buffer size to 20k in client

wfxiang08/changes,dropbox/changes,bowlofstew/changes,dropbox/changes,dropbox/changes,dropbox/changes,bowlofstew/changes,bowlofstew/changes,wfxiang08/changes,wfxiang08/changes,bowlofstew/changes,wfxiang08/changes