The Jenkins tests are showing a significant performance regression in the logging tests:

http://build.wiredtiger.com:8080/job/wiredtiger-perf-log-consolidated/plot/

There are a lot of new commits included in the run, but the most likely cause is:

WT-2134 Force out pending log slot buffer to advance log->alloc_lsn for (commit: 7dbe9256f67ae9c53237fb0c4f9534ff10e4b3c1)