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Wysocki wrote: > Hi, > > The timing of this is not perfect (sorry about that), but here's a refresh > of this series. > > The majority of the previous cover letter still applies: > [...] Hello, the series is tested using -> tbench (packets processing with loopback networking, measures throughput) -> dbench (filesystem operations, measures average latency) -> kernbench (kernel compilation, elapsed time) -> and gitsource (long-running shell script, elapsed time) These are chosen because none of them is bound by compute and all are sensitive to freq scaling decisions. The machines are a Cascade Lake based server, a client Skylake and a Coffee Lake laptop. What's being compared: sugov-HWP.desired : the present series; intel_pstate=passive, governor=schedutil sugov-HWP.min : mainline; intel_pstate=passive, governor=schedutil powersave-HWP : mainline; intel_pstate=active, governor=powersave perfgov-HWP : mainline; intel_pstate=active, governor=performance sugov-no-HWP : HWP disabled; intel_pstate=passive, governor=schedutil Dbench and Kernbench have neutral results, but Tbench has sugov-HWP.desired lose in both performance and performance-per-watt, while Gitsource show the series as faster in raw performance but again worse than the competition in efficiency. 1. SUMMARY BY BENCHMARK 1.1. TBENCH 1.2. DBENCH 1.3. KERNBENCH 1.4. GITSOURCE 2. SUMMARY BY USER PROFILE 2.1. PERFORMANCE USER: what if I switch pergov -> schedutil? 2.2. DEFAULT USER: what if I switch powersave -> schedutil? 2.3. DEVELOPER: what if I switch sugov-HWP.min -> sugov-HWP.desired? 3. RESULTS TABLES PERFORMANCE RATIOS PERFORMANCE-PER-WATT RATIOS 1. SUMMARY BY BENCHMARK ~~~~~~~~~~~~~~~~~~~~~~~ Tbench: sugov-HWP.desired is the worst performance on all three machines. sugov-HWP.min is between 20% and 90% better. The baseline sugov-HWP.desired offers a lower throughput, but does it increase efficiency? It actually doesn't: on two out of three machines the incumbent code (current sugov, or intel_pstate=active) has 10% to 35% better efficiency. In other word, the status quo is both faster and more efficient than the proposed series on this benchmark. The absolute power consumption is lower, but the delivered performance is "even more lower", and that's why performance-per-watt shows a net loss. Dbench: generally neutral, in both performance and efficiency. Powersave is occasionally behind the pack in performance, 5% to 15%. A 15% performance loss on the Coffe Lake is compensated by an 80% improved efficiency. To be noted that on the same Coffee Lake sugov-no-HWP is 20% ahead of the pack in efficiency. Kernbench: neutral, in both performance and efficiency. powersave looses 14% to the pack in performance on the Cascade Lake. Gitsource: this test show the most compelling case against the sugov-HWP.desired series: on the Cascade Lake sugov-HWP.desired is 10% faster than sugov-HWP.min (it was expected to be slower!) and 35% less efficient (we expected more performance-per-watt, not less). 2. SUMMARY BY USER PROFILE ~~~~~~~~~~~~~~~~~~~~~~~~~~ If I was a perfgov-HWP user, I would be 20%-90% faster than with other governors on tbench an gitsource. This speed gap comes with an unexpected efficiency bonus on both test. Since dbench and kernbench have a flat profile across the board, there is no incentive to try another governor. If I was a powersave-HWP user, I'd be the slower of the bunch. The lost performance is not, in general, balanced by better efficiency. This only happens on Coffee Lake, which is a CPU for the mobile market and possibly HWP has efficiency-oriented tuning there. Any flavor of schedutil would be an improvement. From a developer perspective, the obstacles to move from HWP.min to HWP.desired are tbench, where HWP.desired is worse than having no HWP support at all, and gitsource, where HWP.desired has the opposite properties than those advertised (it's actually faster but less efficient). 3. RESULTS TABLES ~~~~~~~~~~~~~~~~~ Tilde (~) means the result is the same as baseline (or, the ratio is close to 1). The double asterisk (**) is a visual aid and means the result is better than baseline (higher or lower depending on the case). | 80x_CASCADELAKE_NUMA: Intel Cascade Lake, 40 cores / 80 threads, NUMA, SATA SSD storage + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | sugov-HWP.des sugov-HWP.min powersave-HWP perfgov-HWP sugov-no-HWP better if + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | PERFORMANCE RATIOS | tbench 1.00 1.89** 1.88** 1.89** 1.17** higher | dbench 1.00 ~ 1.06 ~ ~ lower | kernbench 1.00 ~ 1.14 ~ ~ lower | gitsource 1.00 1.11 2.70 0.80** ~ lower + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | PERFORMANCE-PER-WATT RATIOS | tbench 1.00 1.36** 1.38** 1.33** 1.04** higher | dbench 1.00 ~ ~ ~ ~ higher | kernbench 1.00 ~ ~ ~ ~ higher | gitsource 1.00 1.36** 0.63 1.22** 1.02** higher | 8x_COFFEELAKE_UMA: Intel Coffee Lake, 4 cores / 8 threads, UMA, NVMe SSD storage + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | sugov-HWP.des sugov-HWP.min powersave-HWP perfgov-HWP sugov-no-HWP better if + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | PERFORMANCE RATIOS | tbench 1.00 1.27** 1.30** 1.30** 1.31** higher | dbench 1.00 ~ 1.15 ~ ~ lower | kernbench 1.00 ~ ~ ~ ~ lower | gitsource 1.00 ~ 2.09 ~ ~ lower + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | PERFORMANCE-PER-WATT RATIOS | tbench 1.00 ~ ~ ~ ~ higher | dbench 1.00 ~ 1.82** ~ 1.22** higher | kernbench 1.00 ~ ~ ~ ~ higher | gitsource 1.00 ~ 1.56** ~ 1.17** higher | 8x_SKYLAKE_UMA: Intel Skylake (client), 4 cores / 8 threads, UMA, SATA SSD storage + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | sugov-HWP.des sugov-HWP.min powersave-HWP perfgov-HWP sugov-no-HWP better if + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | PERFORMANCE RATIOS | tbench 1.00 1.21** 1.22** 1.20** 1.06** higher | dbench 1.00 ~ ~ ~ ~ lower | kernbench 1.00 ~ ~ ~ ~ lower | gitsource 1.00 ~ 1.71 0.96** ~ lower + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | PERFORMANCE-PER-WATT RATIOS | tbench 1.00 1.11** 1.12** 1.10** 1.03** higher | dbench 1.00 ~ ~ ~ ~ higher | kernbench 1.00 ~ ~ ~ ~ higher | gitsource 1.00 ~ 0.75 ~ ~ higher Giovanni