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From: Ming Lei <tom.leiming@gmail.com>
To: Aaron Tomlin <atomlin@atomlin.com>
Cc: Ming Lei <ming.lei@redhat.com>,
	axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me,
	mst@redhat.com, aacraid@microsemi.com,
	James.Bottomley@hansenpartnership.com,
	martin.petersen@oracle.com, liyihang9@h-partners.com,
	kashyap.desai@broadcom.com, sumit.saxena@broadcom.com,
	shivasharan.srikanteshwara@broadcom.com,
	chandrakanth.patil@broadcom.com, sathya.prakash@broadcom.com,
	sreekanth.reddy@broadcom.com,
	suganath-prabu.subramani@broadcom.com, ranjan.kumar@broadcom.com,
	jinpu.wang@cloud.ionos.com, tglx@kernel.org, mingo@redhat.com,
	peterz@infradead.org, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, akpm@linux-foundation.org,
	maz@kernel.org, ruanjinjie@huawei.com, bigeasy@linutronix.de,
	yphbchou0911@gmail.com, wagi@kernel.org, frederic@kernel.org,
	longman@redhat.com, chenridong@huawei.com, hare@suse.de,
	kch@nvidia.com, steve@abita.co, sean@ashe.io, chjohnst@gmail.com,
	neelx@suse.com, mproche@gmail.com, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, virtualization@lists.linux.dev,
	linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org,
	megaraidlinux.pdl@broadcom.com, mpi3mr-linuxdrv.pdl@broadcom.com,
	MPT-FusionLinux.pdl@broadcom.com
Subject: Re: [PATCH v10 13/13] docs: add io_queue flag to isolcpus
Date: Thu, 16 Apr 2026 08:48:26 +0800	[thread overview]
Message-ID: <aeAx2g-nJQO2yyS4@fedora> (raw)
In-Reply-To: <fouvg7qn7g4yah7jsvzkdmweesbp4aqmhx37gf3ow5medzvuyk@5n3ddkijosr6>

On Wed, Apr 15, 2026 at 10:56:37AM -0400, Aaron Tomlin wrote:
> On Mon, Apr 13, 2026 at 11:11:15PM +0800, Ming Lei wrote:
> > But typical applications aren't supposed to submit IOs from these
> > isolated CPUs, so in reality, it isn't a big deal.
> 
> Hi Ming,
> 
> While that may be true for general-purpose workloads, it is a fundamentally
> incorrect assumption for the highly specialised environments that actually
> rely on strict CPU isolation, such as High-Frequency Trading (HFT).
> 
> The requirement in these strict environments is not that the isolated CPU
> performs zero I/O. Rather, the requirement is that the isolated CPU must be
> shielded from the unpredictable latency of the hardware completion
> interrupt.

Again it is just your opinion, not a bug report, may not be a fact, right?
Which kind of HFT application submits IO from isolated CPU?

However, as I mentioned, I don't object this patchset, but you have to fix all
wrong comment & document & bug found in review first.


Thanks, 
Ming

  reply	other threads:[~2026-04-16  0:48 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-01 22:22 [PATCH v10 00/13] blk: honor isolcpus configuration Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 01/13] scsi: aacraid: use block layer helpers to calculate num of queues Aaron Tomlin
2026-04-03  1:43   ` Martin K. Petersen
2026-04-01 22:23 ` [PATCH v10 02/13] lib/group_cpus: remove dead !SMP code Aaron Tomlin
2026-04-03  1:45   ` Martin K. Petersen
2026-04-01 22:23 ` [PATCH v10 03/13] lib/group_cpus: Add group_mask_cpus_evenly() Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 04/13] genirq/affinity: Add cpumask to struct irq_affinity Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 05/13] blk-mq: add blk_mq_{online|possible}_queue_affinity Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 06/13] nvme-pci: use block layer helpers to constrain queue affinity Aaron Tomlin
2026-04-03  1:46   ` Martin K. Petersen
2026-04-01 22:23 ` [PATCH v10 07/13] scsi: Use " Aaron Tomlin
2026-04-03  1:46   ` Martin K. Petersen
2026-04-01 22:23 ` [PATCH v10 08/13] virtio: blk/scsi: use " Aaron Tomlin
2026-04-03  1:47   ` Martin K. Petersen
2026-04-01 22:23 ` [PATCH v10 09/13] isolation: Introduce io_queue isolcpus type Aaron Tomlin
2026-04-03  1:47   ` Martin K. Petersen
2026-04-01 22:23 ` [PATCH v10 10/13] blk-mq: use hk cpus only when isolcpus=io_queue is enabled Aaron Tomlin
2026-04-03  2:06   ` Waiman Long
2026-04-05 23:09     ` Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 11/13] blk-mq: prevent offlining hk CPUs with associated online isolated CPUs Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 12/13] genirq/affinity: Restrict managed IRQ affinity to housekeeping CPUs Aaron Tomlin
2026-04-01 22:23 ` [PATCH v10 13/13] docs: add io_queue flag to isolcpus Aaron Tomlin
2026-04-03  2:30   ` Ming Lei
2026-04-06  1:15     ` Aaron Tomlin
2026-04-06  3:29       ` Ming Lei
2026-04-08 15:58         ` Aaron Tomlin
2026-04-09 15:00           ` Ming Lei
2026-04-10  1:45             ` Aaron Tomlin
2026-04-10  2:44               ` Ming Lei
2026-04-10 19:31                 ` Aaron Tomlin
2026-04-11 12:52                   ` Ming Lei
2026-04-12 22:50                     ` Aaron Tomlin
2026-04-13 15:11                       ` Ming Lei
2026-04-15  8:34                         ` Sebastian Andrzej Siewior
2026-04-15  8:58                           ` Ming Lei
2026-04-15 14:47                           ` Aaron Tomlin
2026-04-15 14:56                         ` Aaron Tomlin
2026-04-16  0:48                           ` Ming Lei [this message]
2026-04-16 13:40                             ` Aaron Tomlin

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