run bench_sendall.py on travis

Makefile

@@ -53,16 +53,21 @@ travistest:
 	${PYTHON} -c 'import greenlet; print(greenlet, greenlet.__version__)'
 
 	${PYTHON} setup.py install
+	make bench
 
 	cd greentest && GEVENT_RESOLVER=thread ${PYTHON} testrunner.py --config ../known_failures.py
 	cd greentest && GEVENT_RESOLVER=ares GEVENTARES_SERVERS=8.8.8.8 ${PYTHON} testrunner.py --config ../known_failures.py --ignore tests_that_dont_use_resolver.txt
 	cd greentest && GEVENT_FILE=thread ${PYTHON} testrunner.py --config ../known_failures.py `grep -l subprocess test_*.py`
 
+bench:
+	${PYTHON} greentest/bench_sendall.py
+
 travis_pypy:
 	# no need to repeat linters here
 	which ${PYTHON}
 	${PYTHON} --version
 	${PYTHON} setup.py install
+	make bench
 	cd greentest && ${PYTHON} testrunner.py --config ../known_failures.py
 
 travis_cpython: