From: Ming Lei <ming.lei@redhat.com>
To: Bart Van Assche <bvanassche@acm.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Jens Axboe <axboe@fb.com>,
Hannes Reinecke <hare@suse.com>, Sagi Grimberg <sagi@grimberg.me>,
linux-scsi@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Long Li <longli@microsoft.com>,
John Garry <john.garry@huawei.com>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
Keith Busch <keith.busch@intel.com>,
Ingo Molnar <mingo@redhat.com>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 3/4] nvme: pci: pass IRQF_RESCURE_THREAD to request_threaded_irq
Date: Wed, 28 Aug 2019 09:45:25 +0800 [thread overview]
Message-ID: <20190828014524.GA8090@ming.t460p> (raw)
In-Reply-To: <7cdb9dbb-46e5-b66a-ddf1-c7ecceb28d7a@acm.org>
On Tue, Aug 27, 2019 at 08:10:42AM -0700, Bart Van Assche wrote:
> On 8/27/19 1:53 AM, Ming Lei wrote:
> > If one vector is spread on several CPUs, usually the interrupt is only
> > handled on one of these CPUs.
>
> Is that perhaps a limitation of x86 interrupt handling hardware? See also
> the description of physical and logical destination mode of the local APIC
> in the Intel documentation.
>
> Does that limitation also apply to other platforms than x86?
Please see the following excellent explanation from Thomas.
https://lkml.org/lkml/2018/4/4/734
Especially the following words:
So at some point we ripped out the multi target support on X86 and moved
everything to single target delivery mode.
Other architectures never supported multi target delivery either due to
hardware restrictions or for similar reasons why X86 dropped it. There
might be a few architectures which support it, but I have no overview at
the moment.
thanks,
Ming
next prev parent reply other threads:[~2019-08-28 1:45 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-27 8:53 [PATCH 0/4] genirq/nvme: add IRQF_RESCUE_THREAD for avoiding IRQ flood Ming Lei
2019-08-27 8:53 ` [PATCH 1/4] softirq: implement IRQ flood detection mechanism Ming Lei
2019-08-27 14:42 ` Thomas Gleixner
2019-08-27 16:19 ` Thomas Gleixner
2019-08-27 23:04 ` Ming Lei
2019-08-27 23:12 ` Thomas Gleixner
2019-08-27 22:58 ` Ming Lei
2019-08-27 23:09 ` Thomas Gleixner
2019-08-28 11:06 ` Ming Lei
2019-08-28 11:23 ` Thomas Gleixner
2019-08-28 13:50 ` Ming Lei
2019-08-28 14:07 ` Thomas Gleixner
2019-09-03 3:30 ` Ming Lei
2019-09-03 5:59 ` Daniel Lezcano
2019-09-03 6:31 ` Ming Lei
2019-09-03 6:40 ` Daniel Lezcano
2019-09-03 7:28 ` Ming Lei
2019-09-03 7:50 ` Daniel Lezcano
2019-09-03 9:30 ` Ming Lei
2019-09-04 17:07 ` Bart Van Assche
2019-09-04 17:31 ` Daniel Lezcano
2019-09-04 17:38 ` Bart Van Assche
2019-09-04 18:02 ` Peter Zijlstra
2019-09-04 19:47 ` Bart Van Assche
2019-09-05 9:11 ` Ming Lei
2019-09-05 9:06 ` Ming Lei
2019-09-05 10:37 ` Daniel Lezcano
2019-09-06 1:22 ` Long Li
2019-09-06 4:36 ` Daniel Lezcano
2019-09-06 4:44 ` Long Li
2019-09-06 1:48 ` Ming Lei
2019-09-06 5:14 ` Daniel Lezcano
2019-09-06 18:30 ` Sagi Grimberg
2019-09-06 18:52 ` Keith Busch
2019-09-07 0:01 ` Ming Lei
2019-09-10 3:10 ` Sagi Grimberg
2019-09-18 0:00 ` Long Li
2019-09-20 17:14 ` Sagi Grimberg
2019-09-20 19:12 ` Long Li
2019-09-20 20:45 ` Sagi Grimberg
2019-09-24 0:57 ` Long Li
2019-09-18 14:37 ` Ming Lei
2019-09-20 17:09 ` Sagi Grimberg
2019-09-06 14:18 ` Keith Busch
2019-09-06 17:50 ` Long Li
2019-09-06 22:19 ` Ming Lei
2019-09-06 22:25 ` Keith Busch
2019-09-06 23:13 ` Ming Lei
2019-09-10 0:24 ` Ming Lei
2019-09-03 8:09 ` Thomas Gleixner
2019-09-03 9:24 ` Ming Lei
2019-08-29 6:15 ` Long Li
2019-08-30 0:55 ` Ming Lei
2019-08-27 8:53 ` [PATCH 2/4] genirq: add IRQF_RESCUE_THREAD Ming Lei
2019-08-27 8:53 ` [PATCH 3/4] nvme: pci: pass IRQF_RESCURE_THREAD to request_threaded_irq Ming Lei
2019-08-27 9:06 ` Johannes Thumshirn
2019-08-27 9:09 ` Ming Lei
2019-08-27 9:12 ` Johannes Thumshirn
2019-08-27 14:34 ` Keith Busch
2019-08-27 14:44 ` Keith Busch
2019-08-27 15:10 ` Bart Van Assche
2019-08-28 1:45 ` Ming Lei [this message]
2019-08-27 8:53 ` [PATCH 4/4] genirq: use irq's affinity for threaded irq with IRQF_RESCUE_THREAD Ming Lei
2019-08-27 14:35 ` Keith Busch
2019-09-06 8:50 ` John Garry
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