 We evaluate P-FOO on several production traces, where results show that recent caching systems are  still far from optimal  .
<meaning-changed>  We evaluate P-FOO on several production traces, where results show that recent caching systems are  still far from optimal  .
 We evaluate P-FOO on several production traces, where results show that recent caching systems are still far from optimal , suffering 11-43\% more cache misses than OPT, whereas the best prior offline bounds suggest that there is essentially no room for improvement .