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From: chris hyser <chris.hyser@oracle.com>
To: "Li, Aubrey" <aubrey.li@linux.intel.com>,
	Julien Desfossez <jdesfossez@digitalocean.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Vineeth Pillai <viremana@linux.microsoft.com>,
	Joel Fernandes <joelaf@google.com>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Aaron Lu <aaron.lwe@gmail.com>,
	Aubrey Li <aubrey.intel@gmail.com>,
	Dhaval Giani <dhaval.giani@oracle.com>,
	Nishanth Aravamudan <naravamudan@digitalocean.com>
Cc: mingo@kernel.org, tglx@linutronix.de, pjt@google.com,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	fweisbec@gmail.com, keescook@chromium.org, kerrnel@google.com,
	Phil Auld <pauld@redhat.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	joel@joelfernandes.org, vineeth@bitbyteword.org,
	Chen Yu <yu.c.chen@intel.com>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Agata Gruza <agata.gruza@intel.com>,
	Antonio Gomez Iglesias <antonio.gomez.iglesias@intel.com>,
	graf@amazon.com, konrad.wilk@oracle.com, dfaggioli@suse.com,
	rostedt@goodmis.org, derkling@google.com, benbjiang@tencent.com,
	Aaron Lu <ziqian.lzq@antfin.com>,
	"Ning, Hongyu" <hongyu.ning@linux.intel.com>
Subject: Re: [RFC PATCH v7 11/23] sched/fair: core wide cfs task priority comparison
Date: Wed, 16 Sep 2020 10:24:54 -0400	[thread overview]
Message-ID: <51424491-b7e0-b245-1062-319021eb1845@oracle.com> (raw)
In-Reply-To: <81b208ad-b9e6-bfbf-631e-02e9f75d73a2@linux.intel.com>

On 9/16/20 8:57 AM, Li, Aubrey wrote:
>> Here are the uperf results of the various patchsets. Note, that disabling smt is better for these tests and that that presumably reflects the overall overhead of core scheduling which went from bad to really bad. The primary focus in this email is to start to understand what happened within core sched itself.
>>
>> patchset          smt=on/cs=off  smt=off    smt=on/cs=on
>> --------------------------------------------------------
>> v5-v5.6.y      :    1.78Gb/s     1.57Gb/s     1.07Gb/s
>> pre-v6-v5.6.y  :    1.75Gb/s     1.55Gb/s    822.16Mb/s
>> v6-5.7         :    1.87Gs/s     1.56Gb/s    561.6Mb/s
>> v6-5.7-hotplug :    1.75Gb/s     1.58Gb/s    438.21Mb/s
>> v7             :    1.80Gb/s     1.61Gb/s    440.44Mb/s
> 
> I haven't had a chance to play with v7, but I got something different.
> 
>    branch		smt=on/cs=on
> coresched/v5-v5.6.y	1.09Gb/s
> coresched/v6-v5.7.y	1.05Gb/s
> 
> I attached my kernel config in case you want to make a comparison, or you
> can send yours, I'll try to see I can replicate your result.

I will give this config a try. One of the reports forwarded to me about the drop in uperf perf was an email from you I 
believe mentioning a 50% perf drop between v5 and v6?? I was actually setting out to duplicate your results. :-)

-chrish



  parent reply	other threads:[~2020-09-16 22:21 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-28 19:51 [RFC PATCH v7 00/23] Core scheduling v7 Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 01/23] sched: Wrap rq::lock access Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 02/23] sched: Introduce sched_class::pick_task() Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 03/23] sched: Core-wide rq->lock Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 04/23] sched/fair: Add a few assertions Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 05/23] sched: Basic tracking of matching tasks Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 06/23] bitops: Introduce find_next_or_bit Julien Desfossez
2020-09-03  5:13   ` Randy Dunlap
2020-08-28 19:51 ` [RFC PATCH v7 07/23] cpumask: Introduce a new iterator for_each_cpu_wrap_or Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 08/23] sched: Add core wide task selection and scheduling Julien Desfossez
2020-08-28 20:51   ` Peter Zijlstra
2020-08-28 22:02     ` Vineeth Pillai
2020-08-28 22:23       ` Joel Fernandes
2020-08-29  7:47       ` peterz
2020-08-31 13:01         ` Vineeth Pillai
2020-08-31 14:24         ` Joel Fernandes
2020-09-01  3:38         ` Joel Fernandes
2020-09-01  5:10         ` Joel Fernandes
2020-09-01 12:34           ` Vineeth Pillai
2020-09-01 17:30             ` Joel Fernandes
2020-09-01 21:23               ` Vineeth Pillai
2020-09-02  1:11                 ` Joel Fernandes
2020-08-28 20:55   ` Peter Zijlstra
2020-08-28 22:15     ` Vineeth Pillai
2020-09-15 20:08   ` Joel Fernandes
2020-08-28 19:51 ` [RFC PATCH v7 09/23] sched/fair: Fix forced idle sibling starvation corner case Julien Desfossez
2020-08-28 21:25   ` Peter Zijlstra
2020-08-28 23:24     ` Vineeth Pillai
2020-08-28 19:51 ` [RFC PATCH v7 10/23] sched/fair: wrapper for cfs_rq->min_vruntime Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 11/23] sched/fair: core wide cfs task priority comparison Julien Desfossez
2020-08-28 21:29   ` Peter Zijlstra
2020-09-17 14:15     ` Vineeth Pillai
2020-09-17 20:39       ` Vineeth Pillai
2020-09-23  1:46     ` Joel Fernandes
2020-09-23  1:52       ` Joel Fernandes
2020-09-25 15:02         ` Joel Fernandes
2020-09-15 21:49   ` chris hyser
     [not found]     ` <81b208ad-b9e6-bfbf-631e-02e9f75d73a2@linux.intel.com>
2020-09-16 14:24       ` chris hyser [this message]
2020-09-16 20:53         ` chris hyser
2020-09-17  1:09           ` Li, Aubrey
2020-08-28 19:51 ` [RFC PATCH v7 12/23] sched: Trivial forced-newidle balancer Julien Desfossez
2020-09-02  7:08   ` Pavan Kondeti
2020-08-28 19:51 ` [RFC PATCH v7 13/23] sched: migration changes for core scheduling Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 14/23] irq_work: Add support to detect if work is pending Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 15/23] entry/idle: Add a common function for activites during idle entry/exit Julien Desfossez
2020-08-30  2:17   ` kernel test robot
2020-08-28 19:51 ` [RFC PATCH v7 16/23] arch/x86: Add a new TIF flag for untrusted tasks Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 17/23] kernel/entry: Add support for core-wide protection of kernel-mode Julien Desfossez
2020-08-30  6:50   ` [kernel/entry] 872a0a3f0b: will-it-scale.per_thread_ops -18.7% regression kernel test robot
2020-09-01 15:54   ` [RFC PATCH v7 17/23] kernel/entry: Add support for core-wide protection of kernel-mode Thomas Gleixner
2020-09-01 16:50     ` Joel Fernandes
2020-09-01 20:02       ` Thomas Gleixner
2020-09-02  1:29         ` Joel Fernandes
2020-09-02  7:53           ` Thomas Gleixner
2020-09-02 15:12             ` Joel Fernandes
2020-09-02 16:57             ` Dario Faggioli
2020-09-03  4:34               ` Joel Fernandes
2020-09-03 11:05                 ` Vineeth Pillai
2020-09-03 13:20                 ` Thomas Gleixner
2020-09-03 20:30                   ` Joel Fernandes
2020-09-03 13:43                 ` Dario Faggioli
2020-09-03 20:25                   ` Joel Fernandes
2020-08-28 19:51 ` [RFC PATCH v7 18/23] entry/idle: Enter and exit kernel protection during idle entry and exit Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 19/23] entry/kvm: Protect the kernel when entering from guest Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 20/23] sched/coresched: config option for kernel protection Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 21/23] sched: cgroup tagging interface for core scheduling Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 22/23] Documentation: Add documentation on " Julien Desfossez
2020-08-28 19:51 ` [RFC PATCH v7 23/23] sched: Debug bits Julien Desfossez

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