From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752674AbeCTKCu (ORCPT ); Tue, 20 Mar 2018 06:02:50 -0400 Received: from mailout5.zih.tu-dresden.de ([141.30.67.74]:42318 "EHLO mailout5.zih.tu-dresden.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752027AbeCTKCq (ORCPT ); Tue, 20 Mar 2018 06:02:46 -0400 Subject: Re: [RFT][PATCH v5 0/7] sched/cpuidle: Idle loop rework To: "Rafael J. Wysocki" , Peter Zijlstra CC: Doug Smythies , Linux PM , Frederic Weisbecker , Thomas Gleixner , Paul McKenney , "Rik van Riel" , Aubrey Li , "Mike Galbraith" , LKML References: <2142751.3U6XgWyF8u@aspire.rjw.lan> <001a01d3be0a$ad3a0ed0$07ae2c70$@net> <2043615.lCdO10SMaB@aspire.rjw.lan> From: Thomas Ilsche Date: Tue, 20 Mar 2018 11:01:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms060405000609040303060803" X-ClientProxiedBy: MSX-L101.msx.ad.zih.tu-dresden.de (172.26.34.101) To MSX-L104.msx.ad.zih.tu-dresden.de (172.26.34.104) X-PMWin-Version: 4.0.3, Antispam-Engine: 2.7.2, Antispam-Data: 2018.3.20.94217, Antivirus-Engine: 3.70.2, Antivirus-Data: 5.49 X-PMWin-Spam: Gauge=IIIIIIII, Probability=8, Report='__BOUNCE_CHALLENGE_SUBJ 0, __BOUNCE_NDR_SUBJ_EXEMPT 0, __SUBJ_ALPHA_END 0, __TO_MALFORMED_2 0, __TO_NAME 0, __TO_NAME_DIFF_FROM_ACC 0, __HAS_CC_HDR 0, __MULTIPLE_RCPTS_CC_X2 0, __CC_NAME 0, __CC_NAME_DIFF_FROM_ACC 0, __REFERENCES 0, __HAS_FROM 0, __HAS_MSGID 0, __SANE_MSGID 0, __USER_AGENT 0, __MOZILLA_USER_AGENT 0, __MIME_VERSION 0, __IN_REP_TO 0, __CT 0, __CTYPE_HAS_BOUNDARY 0, __CTYPE_MULTIPART 0, __BAT_BOUNDARY 0, __MIME_TEXT_P2 0, __HAS_ATTACHMENT1 0, __ANY_URI 0, __HTTPS_URI 0, __URI_WITH_PATH 0, LINK_TO_IMAGE 0, __MAL_TELEKOM_URI 0, __URI_NO_WWW 0, __FRAUD_CONTACT_NUM 0, __CP_URI_IN_BODY 0, __INT_PROD_COMP 0, __SUBJ_ALPHA_NEGATE 0, __MULTIPLE_URI_TEXT 0, __URI_IN_BODY 0, __URI_NOT_IMG 0, __FORWARDED_MSG 0, __NO_HTML_TAG_RAW 0, BODY_SIZE_10000_PLUS 0, __ATTACHMENT_SIZE_0_10K 0, __HAS_ATTACHMENT2 0, __ATTACHMENT_SIZE_10_25K 0, __MIME_TEXT_P1 0, __URI_NS 0, HTML_00_01 0.05, HTML_00_10 0.05, IN_REP_TO 0, MSG_THREAD 0, __TO_REAL_NAMES 0, __CC_REAL_NAMES 0, MULTIPLE_REAL_RCPTS 0, LEGITIMATE_SIGNS 0, __HAS_ATTACHMENT 0, MULTIPLE_RCPTS 0.1, __MIME_TEXT_P 0, REFERENCES 0, URI_WITH_PATH_ONLY 0' X-PMWin-SpamScore: 8 Message-ID: X-TUD-Virus-Scanned: mailout5.zih.tu-dresden.de Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --------------ms060405000609040303060803 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2018-03-18 17:15, Rafael J. Wysocki wrote: >> Doug, Thomas, >> >> Thank you both for the reports, much appreciated! >> >> Below is a drop-in v6 replacement for patch [4/7]. >> >> With this new patch applied instead of the [4/7] the behavior should b= e much >> more in line with the v4 behavior, so please try it if you can and let= me know >> if that really is the case on your systems. >> >> Patches [5-7/7] from the original v5 apply on top of it right away for= me, >> but I've also created a git branch you can use to pull all of the seri= es >> with the below included: >> >> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \ >> idle-loop Thanks for the git repo, that helps alot. I have tested v6 on a Skylake desktop and server system as well as a Haswell server system. The odd idle behavior of v5 is gone. Some of the other findings may be obsolete by the upcoming respin, I will retest. Our originally observed Powernightmare pattern is effectively prevented in both idle and with a synthetic trigger. However, I can reproduce simple workloads under which the revised menu governor wastes energy by going into *deeper* C-states than advisable. Consider the Skylake server system which has residencies in C1E of 20 us and C6 of 800 us. I use a small while(1) {usleep(300);} unsynchronized pinned to each core. While this is an artificial case, it is a very innocent one - easy to predict and regular. Between vanilla 4.16.0-rc5 and idle-loop/v6, the power consumption increases from 149.7 W to 158.1 W. On 4.16.0-rc5, the cores sleep almost entirely in C1E. With the patches applied, the cores spend ~75% of their sleep time in C6, ~25% in C1E. The average time/usage for C1E is also lower with v6 at ~350 us rather than the ~550 us in C6 (and in C1E with the baseline). Generally the new menu governor seems to chose C1E if the next timer is an enabled sched timer - which occasionally interrupts the sleep-interval into two C1E sleeps rather than one C6. Manually disabling C6, reduces power consumption back to 149.5 W. This is far from what I expected, I did not yet figure out why the patched menu governor decides to go to C6 under that workload. I have tested this previously with v4 and saw this behavior even without path "7/7". The results from Haswell-EP and Skylake desktop are similar. The tests are with a 1000 Hz kernel because I wanted to amplify effects that happening when C-state residencies and tick timers are closer together. But I suspect the results will be similar with 300 Hz as the impact from the sched tick interruption seems to be minor compared to the odd C-state selection. Some very raw illustrations, all from Skylake SP (2 =3D=3D C1E, 3 =3D=3D = C6): power consumption trigger-10-10 is the synthetic Powernightmare poller-omp-300 is the parallel usleep(300) loop: https://wwwpub.zih.tu-dresden.de/~tilsche/powernightmares/v6_skl_sp_power= =2Epng cstate utilization with usleep(300) loop (as per /sys/.../stateN/time / wall time) https://wwwpub.zih.tu-dresden.de/~tilsche/powernightmares/v6_skl_sp_poll_= 300_utilization.png average time spent in cstates (as /sys/.../stateN/time / /sys/.../stateN/usage) https://wwwpub.zih.tu-dresden.de/~tilsche/powernightmares/v6_skl_sp_poll_= 300_avg_time.png detailed look: https://wwwpub.zih.tu-dresden.de/~tilsche/powernightmares/v6_poll_300_skl= =2Epng >> >> Thanks! >> >> --- >> From: Rafael J. Wysocki >> Subject: [PATCH v6] cpuidle: Return nohz hint from cpuidle_select() >> >> Add a new pointer argument to cpuidle_select() and to the ->select >> cpuidle governor callback to allow a boolean value indicating >> whether or not the tick should be stopped before entering the >> selected state to be returned from there. >> >> Make the ladder governor ignore that pointer (to preserve its >> current behavior) and make the menu governor return 'false" through >> it if: >> (1) the idle exit latency is constrained at 0, >> (2) the selected state is a polling one, or >> (3) the selected state is not deep enough. >> >> Since the value returned through the new argument pointer is not >> used yet, this change is not expected to alter the functionality of >> the code. >> >> Signed-off-by: Rafael J. Wysocki >> --- >=20 > [cut] >=20 >> @@ -354,6 +360,7 @@ static int menu_select(struct cpuidle_dr >> if (latency_req > interactivity_req) >> latency_req =3D interactivity_req; >> >> + expected_interval =3D TICK_USEC_HZ; >> /* >> * Find the idle state with the lowest power while satisfying= >> * our constraints. >> @@ -367,17 +374,44 @@ static int menu_select(struct cpuidle_dr >> continue; >> if (idx =3D=3D -1) >> idx =3D i; /* first enabled state */ >> - if (s->target_residency > data->predicted_us) >> + if (s->target_residency > data->predicted_us) { >> + /* >> + * Retain the tick if the selected state is sh= allower >> + * than the deepest available one with target = residency >> + * within the tick period range. >> + * >> + * This allows the tick to be stopped even if = the >> + * predicted idle duration is within the tick = period >> + * range to counter the effect by which the pr= ediction >> + * may be skewed towards lower values due to t= he tick >> + * bias. >> + */ >> + expected_interval =3D s->target_residency; >> break; >=20 > BTW, I guess I need to explain the motivation here more thoroughly, so > here it goes. >=20 > The governor predicts idle duration under the assumption that the > tick will be stopped, so if the result of the prediction is within the = tick > period range and it is not accurate, that needs to be taken into > account in the governor's statistics. However, if the tick is allowed > to run every time the governor predicts idle duration within the tick > period range, the governor will always see that it was "almost > right" and the correction factor applied by it to improve the > prediction next time will not be sufficient. For this reason, it > is better to stop the tick at least sometimes when the governor > predicts idle duration within the tick period range and the idea > here is to do that when the selected state is the deepest available > one with the target residency within the tick period range. This > allows the opportunity to save more energy to be seized which > balances the extra overhead of stopping the tick. >=20 > HTH >=20 --=20 Dipl. Inf. 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