Public bug reported: Tracking this down took forever + I believe I now have a test case.
Top priority, is finding a temporary fix for this problem. Here's the symptom... lxd: net12-david-favor # ab -vvv -k -t 10 -n 100000 -c 5 https://DavidFavor.com/foo.txt 2>&1 | egrep -e ^Requests -e ^Failed -e ^Time -e "^Document Length:" Document Length: 8192 bytes Time taken for tests: 8.540 seconds Failed requests: 0 Requests per second: 11710.24 [#/sec] (mean) Time per request: 0.427 [ms] (mean) Time per request: 0.085 [ms] (mean, across all concurrent requests) ab -vvv -k -t 10 -n 100000 -c 5 https://DavidFavor.com/foo.txt 2>&1 | egrep -e ^Requests -e ^Failed -e ^Time -e "^Document Length:" Document Length: 8193 bytes Time taken for tests: 10.087 seconds Failed requests: 5 Requests per second: 1.19 [#/sec] (mean) Time per request: 4202.710 [ms] (mean) Time per request: 840.542 [ms] (mean, across all concurrent requests) First run 1-8192 byte files work great. They serve fast with 0 failed requests. Second run of 8193-... byte files slow to a crawl + produce request failures + notice the "Time taken for tests", which seems to relate to socket housekeeping tests, becomes very slow. This seems to be an actual apache problem, rather than an ab problem, as all sites I host seem to slow down, when Apache2-4.27 is installed. I'll setup a testbed system running Zesty, for which I can provide a login, for debugging, if required. _______ lxd: net12-david-favor # uname -a Linux net12-david-favor 4.8.0-30-generic #32-Ubuntu SMP Fri Dec 2 03:43:27 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux lxd: net12-david-favor # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.10 Release: 16.10 Codename: yakkety lxd: net12-david-favor # apt-cache policy apache2 apache2: Installed: 2.4.27-0.1+ubuntu16.10.1+deb.sury.org+1 Candidate: 2.4.27-0.1+ubuntu16.10.1+deb.sury.org+1 Version table: *** 2.4.27-0.1+ubuntu16.10.1+deb.sury.org+1 500 500 http://ppa.launchpad.net/ondrej/apache2/ubuntu yakkety/main amd64 Packages 100 /var/lib/dpkg/status 2.4.18-2ubuntu4.2 500 500 http://archive.ubuntu.com/ubuntu yakkety-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu yakkety-security/main amd64 Packages 2.4.18-2ubuntu4 500 500 http://archive.ubuntu.com/ubuntu yakkety/main amd64 Packages ** Affects: apache2 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1704168 Title: Apache-2.4.27 massive slow down for files >8192 bytes long To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1704168/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
