Cisco Systems Inc’s decision to acquire software startup AppDynamics for $3.7 billion, nearly double the private-market valuation, reflects Cisco's struggles in building its software business, according to company financial reports and internal documents. The push by Cisco CEO Chuck Robbins to boost the share of revenues from software stalled in the most recent quarter. Executives on its earnings call said 29 percent of Cisco's $12.4 billion in fiscal first quarter revenues came from recurring software and services.