From: Marc Zyngier <maz@kernel.org>
To: John Garry <john.garry@huawei.com>
Cc: Ming Lei <ming.lei@redhat.com>, <tglx@linutronix.de>,
"chenxiang (M)" <chenxiang66@hisilicon.com>,
<bigeasy@linutronix.de>, <linux-kernel@vger.kernel.org>,
<hare@suse.com>, <hch@lst.de>, <axboe@kernel.dk>,
<bvanassche@acm.org>, <peterz@infradead.org>, <mingo@redhat.com>
Subject: Re: [PATCH RFC 1/1] genirq: Make threaded handler use irq affinity for managed interrupt
Date: Fri, 20 Dec 2019 16:16:31 +0000 [thread overview]
Message-ID: <a46aaad9e00dbfa5817b3698450ae7be@www.loen.fr> (raw)
In-Reply-To: <a5154365-59c5-429b-559e-94ad6dffcdb0@huawei.com>
On 2019-12-20 15:38, John Garry wrote:
> I've already done something experimental for the driver to manage the
> affinity, and performance is generally much better:
>
>
> https://github.com/hisilicon/kernel-dev/commit/e15bd404ed1086fed44da34ed3bd37a8433688a7
>
> But I still think it's wise to only consider managed interrupts for
> now.
Sure. We've lived with it so far, we can make it last a bit longer...
;-)
>>
>>> JFYI, about NVMe CPU lockup issue, there are 2 works on going here:
>>>
>>>
>>> https://lore.kernel.org/linux-nvme/20191209175622.1964-1-kbusch@kernel.org/T/#t
>>>
>>>
>>>
>>> https://lore.kernel.org/linux-block/20191218071942.22336-1-ming.lei@redhat.com/T/#t
>>>
>> I've also managed to trigger some of them now that I have access to
>> a decent box with nvme storage.
>
> I only have 2x NVMe SSDs when this occurs - I should not be hitting
> this...
Same configuration here. And the number of interrupts is pretty
low (less that 20k/s per CPU), so I doubt this is interrupt related.
> Out of curiosity, have you tried
>> with the SMMU disabled? I'm wondering whether we hit some livelock
>> condition on unmapping buffers...
>
> No, but I can give it a try. Doing that should lower the CPU usage,
> though, so maybe masks the issue - probably not.
I wonder whether we could end-up in some form of unmap storm on
completion, with a CPU being starved trying to insert its TLBI
command into the queue.
Anyway, more digging in perspective.
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2019-12-20 16:16 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-06 14:35 [PATCH RFC 0/1] Threaded handler uses irq affinity for when the interrupt is managed John Garry
2019-12-06 14:35 ` [PATCH RFC 1/1] genirq: Make threaded handler use irq affinity for managed interrupt John Garry
2019-12-06 15:22 ` Marc Zyngier
2019-12-06 16:16 ` John Garry
2019-12-07 8:03 ` Ming Lei
2019-12-09 14:30 ` John Garry
2019-12-09 15:09 ` Hannes Reinecke
2019-12-09 15:17 ` Marc Zyngier
2019-12-09 15:25 ` Hannes Reinecke
2019-12-09 15:36 ` Marc Zyngier
2019-12-09 15:49 ` Qais Yousef
2019-12-09 15:55 ` Marc Zyngier
2019-12-10 1:43 ` Ming Lei
2019-12-10 9:45 ` John Garry
2019-12-10 10:06 ` Ming Lei
2019-12-10 10:28 ` Marc Zyngier
2019-12-10 10:59 ` John Garry
2019-12-10 11:36 ` Marc Zyngier
2019-12-10 12:05 ` John Garry
2019-12-10 18:32 ` Marc Zyngier
2019-12-11 9:41 ` John Garry
2019-12-13 10:07 ` John Garry
2019-12-13 10:31 ` Marc Zyngier
2019-12-13 12:08 ` John Garry
2019-12-14 10:59 ` Marc Zyngier
2019-12-11 17:09 ` John Garry
2019-12-12 22:38 ` Ming Lei
2019-12-13 11:12 ` John Garry
2019-12-13 13:18 ` Ming Lei
2019-12-13 15:43 ` John Garry
2019-12-13 17:12 ` Ming Lei
2019-12-13 17:50 ` John Garry
2019-12-14 13:56 ` Marc Zyngier
2019-12-16 10:47 ` John Garry
2019-12-16 11:40 ` Marc Zyngier
2019-12-16 14:17 ` John Garry
2019-12-16 18:00 ` Marc Zyngier
2019-12-16 18:50 ` John Garry
2019-12-20 11:30 ` John Garry
2019-12-20 14:43 ` Marc Zyngier
2019-12-20 15:38 ` John Garry
2019-12-20 16:16 ` Marc Zyngier [this message]
2019-12-20 23:31 ` Ming Lei
2019-12-23 9:07 ` Marc Zyngier
2019-12-23 10:26 ` John Garry
2019-12-23 10:47 ` Marc Zyngier
2019-12-23 11:35 ` John Garry
2019-12-24 1:59 ` Ming Lei
2019-12-24 11:20 ` Marc Zyngier
2019-12-25 0:48 ` Ming Lei
2020-01-02 10:35 ` John Garry
2020-01-03 0:46 ` Ming Lei
2020-01-03 10:41 ` John Garry
2020-01-03 11:29 ` Ming Lei
2020-01-03 11:50 ` John Garry
2020-01-04 12:03 ` Ming Lei
2020-05-30 7:46 ` [tip: irq/core] irqchip/gic-v3-its: Balance initial LPI affinity across CPUs tip-bot2 for Marc Zyngier
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