A Tale of Apache and Two Congestion Control Algorithms in Linux (With a guest appearance by Openstack and cURL)
Introduction: The shortest intro would be these two cURL times - one for a bare metal server, and one for the Openstack VM - both running the same application, for a specific test URL. Problem: dnslookup: 0.109 | connect: 0.359 | appconnect: 0.000 | pretransfer: 0.359 | starttransfer: 0.624 | total: 6.739 | size: 710012 dnslookup: 0.016 | connect: 0.281 | appconnect: 0.000 | pretransfer: 0.281 | starttransfer: 0.531 | total: 6.958 | size: 710277 dnslookup: 0.000 | connect: 0.265 | appconnect: 0.000 | pretransfer: 0.265 | starttransfer: 0.530 | total: 5.351 | size: 709165 No problem: dnslookup: 0.000 | connect: 0.265 | appconnect: 0.000 | pretransfer: 0.265 | starttransfer: 0.546 | total: 2.168 | size: 705631 dnslookup: 0.015 | connect: 0.281 | appconnect: 0.000 | pretransfer: 0.281 | starttransfer: 0.561 | total: 2.402 | size: 705354 dnslookup: 0.000 | connect: 0.265 | appconnect: 0.000 | pretransfer: 0.265 | starttransfer: 0.546 | total: 2.434 | size: 705485 For more details,