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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2024 12:08:13.1350 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0471201a-5a54-4312-b740-08dcc2a318d4 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509E4.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB6649 Vincent, On 8/22/24 11:28, Luis Machado wrote: > On 8/22/24 10:53, Vincent Guittot wrote: >> On Thu, 22 Aug 2024 at 11:22, Luis Machado wrote: >>> >>> On 8/22/24 09:19, Vincent Guittot wrote: >>>> Hi, >>>> >>>> On Wed, 21 Aug 2024 at 15:34, Hongyan Xia wrote: >>>>> >>>>> Hi Peter, >>>>> >>>>> Sorry for bombarding this thread in the last couple of days. I'm seeing >>>>> several issues in the latest tip/sched/core after these patches landed. >>>>> >>>>> What I'm now seeing seems to be an unbalanced call of util_est. First, I applied >>>> >>>> I also see a remaining util_est for idle rq because of an unbalance >>>> call of util_est_enqueue|dequeue >>>> >>> >>> I can confirm issues with the utilization values and frequencies being driven >>> seemingly incorrectly, in particular for little cores. >>> >>> What I'm seeing with the stock series is high utilization values for some tasks >>> and little cores having their frequencies maxed out for extended periods of >>> time. Sometimes for 5+ or 10+ seconds, which is excessive as the cores are mostly >>> idle. But whenever certain tasks get scheduled there, they have a very high util >>> level and so the frequency is kept at max. >>> >>> As a consequence this drives up power usage. >>> >>> I gave Hongyan's draft fix a try and observed a much more reasonable behavior for >>> the util numbers and frequencies being used for the little cores. With his fix, >>> I can also see lower energy use for my specific benchmark. >> >> The main problem is that the util_est of a delayed dequeued task >> remains on the rq and keeps the rq utilization high and as a result >> the frequency higher than needed. >> >> The below seems to works for me and keep sync the enqueue/dequeue of >> uti_test with the enqueue/dequeue of the task as if de dequeue was not >> delayed >> >> Another interest is that we will not try to migrate a delayed dequeue >> sleeping task that doesn't actually impact the current load of the cpu >> and as a result will not help in the load balance. I haven't yet fully >> checked what would happen with hotplug > > Thanks. Those are good points. Let me go and try your patch. I gave your fix a try, but it seems to make things worse. It is comparable to the behavior we had before Peter added the uclamp imbalance fix, so I believe there is something incorrect there.