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Filter v1.4.2 smtp.subspace.kernel.org 91222606A324 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmx.de header.i=efault@gmx.de header.a=rsa-sha256 header.s=s31663417 header.b=RMhhYJHl DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.de; s=s31663417; t=1793379673; x=1793984473; i=efault@gmx.de; bh=s9cX1gFD+Bkpd+UNN+SfPrifSgjVPXj9Sgn1HdQ/tGE=; h=X-UI-Sender-Class:Message-ID:Subject:From:To:Cc:Date:In-Reply-To: References:Content-Type:Content-Transfer-Encoding:MIME-Version:cc: content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=RMhhYJHlpcRW96ntX5m37HCj7PqYqHAM1QJj2JAuOPHYUCliluMPYfSs+lUArYVC B8+CjGsmqoH2GIHmyFLVPH1mp+KnhX/ueR3yDpa5G+8W9acikn0fzzjRpNy6nN1ZH 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Odyu86BWqgoWZmwG7VgtabdmFqE7H/YUH5Zlup4932OZZPVE0K8/SfIxxOH1XJBsU6mKYKJvj iDM3dRJSHv0MeM3575RLkgS6CbLhytegNlQQ7U7Flaa6OBzGz9M8ylcnaGdLjS4qDzb//1Ybi 1iiLCDOeptVlA0xwEiCLa/DaeXWYFwenZOl87ELsoX52f2+jqmPxs2B67iMLtmaB+F5I/aesV 5h2NcxtVD+lk+P2xDA4gwKJacX9ry1nibGRccYw0w2/x2qtZkP9lj8BgCQ= On Fri, 2026-10-30 at 21:03 +0800, Chengfeng Lin wrote: > Hi Vincent, Mike, Peter, >=20 > I have additional pipe-handoff throughput results for 333238da9a19 > ("sched: Update time before requeueing delayed entities"), which Mike > identified in his wakeup-jitter test [1]. With 15 workers, will-it-scale > throughput on v7.3 is 15.69% lower than v7.1.3 in thread mode and 14.82% > lower in process mode. Reverting this commit on v7.2 in a separate contro= lled > comparison improves 15-worker thread throughput by 13.65%; the 2-worker > control changes by -0.48%. After much crawling over trees etc, and way more yacking than intended for a datapoint, I think I know what's up, and it's simple: there's a good reason those "now" updates are event driven. That one was added in the DELAY_DEQUEUE machinery, where it expends and *banks* precious fastpath cycles, shifting bean counting enough to make DELAY_DEQUEUE measurably less effective. It looks completely broken with a 20% util probe, but more measurement shows that it's not dead, just a bit sad. Test probe sent another signal in virgin flat in __dequeue_task(), and I think it's valid for that update_curr() too. It seems to be in keeping with placement strategy, but with flat changes, we just updated the cfs_rq where all the action is, and hierarchy update is right below it.. looks like redundant overhead. -Mike