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From: Jesse Brandeburg <jesse.brandeburg@intel.com>
To: Nitesh Lal <nilal@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	"frederic@kernel.org" <frederic@kernel.org>,
	"juri.lelli@redhat.com" <juri.lelli@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	abelits@marvell.com, Robin Murphy <robin.murphy@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"rostedt@goodmis.org" <rostedt@goodmis.org>,
	"mingo@kernel.org" <mingo@kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"sfr@canb.auug.org.au" <sfr@canb.auug.org.au>,
	"stephen@networkplumber.org" <stephen@networkplumber.org>,
	"rppt@linux.vnet.ibm.com" <rppt@linux.vnet.ibm.com>,
	"jinyuqi@huawei.com" <jinyuqi@huawei.com>,
	"zhangshaokun@hisilicon.com" <zhangshaokun@hisilicon.com>,
	netdev@vger.kernel.org, chris.friesen@windriver.com
Subject: Re: [Patch v4 1/3] lib: Restrict cpumask_local_spread to houskeeping CPUs
Date: Thu, 29 Apr 2021 18:48:02 -0700	[thread overview]
Message-ID: <20210429184802.0000641e@intel.com> (raw)
In-Reply-To: <CAFki+Lm0W_brLu31epqD3gAV+WNKOJfVDfX2M8ZM__aj3nv9uA@mail.gmail.com>

Nitesh Lal wrote:

> @Jesse do you think the Part-1 findings explain the behavior that you have
> observed in the past?
> 
> Also, let me know if there are any suggestions or experiments to try here.

Wow Nitesh, nice work! That's quite a bit of spelunking you had to do
there!

Your results that show the older kernels with ranged affinity issues is
consistent with what I remember from that time, and the original
problem.

I'm glad to see that a) Thomas fixed the kernel to even do better than
ranged affinity masks, and that b) if you revert my patch, the new
behavior is better and still maintains the fix from a).

For me this explains the whole picture and makes me feel comfortable
with the patch that reverts the initial affinity mask (that also
introduces a subtle bug with the reserved CPUs that I believe you've
noted already).

Thanks for this work!
Jesse

  reply	other threads:[~2021-04-30  1:48 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 22:34 [PATCH v4 0/3] Preventing job distribution to isolated CPUs Nitesh Narayan Lal
2020-06-25 22:34 ` [Patch v4 1/3] lib: Restrict cpumask_local_spread to houskeeping CPUs Nitesh Narayan Lal
2020-06-29 16:11   ` Nitesh Narayan Lal
2020-07-01  0:32     ` Andrew Morton
2020-07-01  0:47       ` Nitesh Narayan Lal
2020-07-09  8:45   ` [tip: sched/core] " tip-bot2 for Alex Belits
2021-01-27 11:57   ` [Patch v4 1/3] " Robin Murphy
2021-01-27 12:19     ` Marcelo Tosatti
2021-01-27 12:36       ` Robin Murphy
2021-01-27 13:09         ` Marcelo Tosatti
2021-01-27 13:49           ` Robin Murphy
2021-01-27 14:16           ` Nitesh Narayan Lal
2021-01-28 15:56           ` Thomas Gleixner
2021-01-28 16:33             ` Marcelo Tosatti
     [not found]             ` <02ac9d85-7ddd-96da-1252-4663feea7c9f@marvell.com>
2021-02-01 17:50               ` [EXT] " Marcelo Tosatti
2021-01-28 16:02       ` Thomas Gleixner
2021-01-28 16:59         ` Marcelo Tosatti
2021-01-28 17:35           ` Nitesh Narayan Lal
2021-01-28 20:01           ` Thomas Gleixner
     [not found]             ` <d2a4dc97-a9ed-e0e7-3b9c-c56ae46f6608@redhat.com>
     [not found]               ` <20210129142356.GB40876@fuller.cnet>
2021-01-29 17:34                 ` [EXT] " Alex Belits
     [not found]                 ` <18584612-868c-0f88-5de2-dc93c8638816@redhat.com>
2021-02-05 19:56                   ` Thomas Gleixner
2021-02-04 18:15             ` Marcelo Tosatti
2021-02-04 18:47               ` Nitesh Narayan Lal
2021-02-04 19:06                 ` Marcelo Tosatti
2021-02-04 19:17                   ` Nitesh Narayan Lal
2021-02-05 22:23                     ` Thomas Gleixner
2021-02-05 22:26                       ` Thomas Gleixner
2021-02-05 23:02                       ` [tip: sched/urgent] Revert "lib: Restrict cpumask_local_spread to houskeeping CPUs" tip-bot2 for Thomas Gleixner
2021-02-07  0:43                       ` [Patch v4 1/3] lib: Restrict cpumask_local_spread to houskeeping CPUs Nitesh Narayan Lal
2021-02-11 15:55                         ` Nitesh Narayan Lal
2021-03-04 18:15                           ` Nitesh Narayan Lal
     [not found]                             ` <faa8d84e-db67-7fbe-891e-f4987f106b20@marvell.com>
2021-03-04 23:23                               ` [EXT] " Nitesh Narayan Lal
2021-04-06 17:22                             ` Jesse Brandeburg
2021-04-07 15:18                               ` Nitesh Narayan Lal
2021-04-08 18:49                                 ` Nitesh Narayan Lal
2021-04-14 16:11                                 ` Jesse Brandeburg
2021-04-15 22:11                                   ` Nitesh Narayan Lal
2021-04-29 21:44                                     ` Nitesh Lal
2021-04-30  1:48                                       ` Jesse Brandeburg [this message]
2021-04-30 13:10                                         ` Nitesh Lal
2021-04-30  7:10                                       ` Thomas Gleixner
2021-04-30 16:14                                         ` Nitesh Lal
2021-04-30 18:21                                           ` Thomas Gleixner
2021-04-30 21:07                                             ` Nitesh Lal
2021-05-01  2:21                                               ` Jesse Brandeburg
2021-05-03 13:15                                                 ` Nitesh Lal
2020-06-25 22:34 ` [Patch v4 2/3] PCI: Restrict probe functions to housekeeping CPUs Nitesh Narayan Lal
2020-07-09  8:45   ` [tip: sched/core] " tip-bot2 for Alex Belits
2020-06-25 22:34 ` [Patch v4 3/3] net: Restrict receive packets queuing " Nitesh Narayan Lal
2020-06-26 11:14   ` Peter Zijlstra
2020-06-26 17:20     ` David Miller
2020-07-09  8:45   ` [tip: sched/core] " tip-bot2 for Alex Belits

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