This OID counts the total number of packets that were sent to the compression engine but could not be compressed because they would have expanded instead. Network engineers monitor this counter to identify data patterns that don't compress well, which can indicate inefficient traffic or broken compression settings that need adjustment. A value of 1,500 packets out of 50,000 total (3% failure rate) suggests most traffic compresses adequately, but consistently high percentages signal that compression may not be worth the CPU overhead for that traffic type.