------- Comment From [email protected] 2024-10-24 12:21 EDT------- Hi Team,
I ran pgbench read-only test 10 times on Ubuntu 24.04 L2 Guest(kernel : 6.8.0-47-generic) with CEDE On and CEDE Off using ppc64_cpu --dscr=23. L2 Guest(kernel : 6.8.0-47-generic) with CEDE On with dscr=23. Scaling Factor: 100 - Clients: 50 - Mode: Read Only: Run1: 2103.705277 Run2: 2240.990259 Run3: 2160.174577 Run4: 2124.544937 Run5: 2137.224839 Run6: 2343.227008 Run7: 2203.68577 Run8: 2032.144727 Run9: 2177.586731 Run10: 2277.18976 Average: 2180 TPS Deviation: 4.14% Samples: 10 L2 Guest(kernel : 6.8.0-47-generic) with CEDE OFF with dscr=23. Scaling Factor: 100 - Clients: 50 - Mode: Read Only: Run1: 2523.648397 Run2: 2521.656585 Run3: 2459.535555 Run4: 2493.216175 Run5: 2496.945005 Run6: 2520.921746 Run7: 2463.883839 Run8: 2483.368813 Run9: 2445.285517 Run10: 2628.295836 Average: 2504 TPS Deviation: 2.07% Samples: 10 PGBENCH Performance Summary: CEDE ON PGBENCH AVG Data : 2180 TPS CEDE OFF PGBENCH AVG Data : 2504 TPS Percentage Drop : (2180-2504 )*100/2504= ~12 % L2 Guest when CEDE was turned ON under-performed by 12% vs CEDE turned OFF. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2070253 Title: KVM on PowerVM: L2 Guest-Aggressively entering CEDE results in low performance. Possible tuning opportunity. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/2070253/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
