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From: Jens Axboe <axboe@fb.com>
To: Ming Lei <ming.lei@redhat.com>, Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>, Long Li <longli@microsoft.com>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	Nadolski Edmund <edmund.nadolski@intel.com>,
	Keith Busch <kbusch@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH V3 0/2] nvme-pci: check CQ after batch submission for Microsoft device
Date: Fri, 22 Nov 2019 14:04:52 +0000
Message-ID: <b5148303-f05d-71c8-787a-597958c1909c@fb.com> (raw)
In-Reply-To: <20191122102517.GA30001@ming.t460p>

On 11/22/19 3:25 AM, Ming Lei wrote:
>> as that will still overload the one cpu that the interrupt handler was
>> assigned to.  A dumb fix would be a cpu mask for the threaded interrupt
> 
> Actually one CPU is fast enough to handle several drive's interrupt handling.
> Also there is per-queue depth limit, and the interrupt flood issue in network
> can't be serious on storage.

This is true today, but it won't be true in the future. Lets aim for a
solution that's a little more future proof than just "enough today", if
we're going to make changes in this area.

-- 
Jens Axboe

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Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-14  2:59 Ming Lei
2019-11-14  2:59 ` [PATCH V3 1/2] nvme-pci: move sq/cq_poll lock initialization into nvme_init_queue Ming Lei
2019-11-14  2:59 ` [PATCH V3 2/2] nvme-pci: check CQ after batch submission for Microsoft device Ming Lei
2019-11-14  4:56   ` Keith Busch
2019-11-14  8:56     ` Ming Lei
2019-11-21  3:11 ` [PATCH V3 0/2] " Ming Lei
2019-11-21  6:14   ` Christoph Hellwig
2019-11-21  7:46     ` Ming Lei
2019-11-21 15:45       ` Keith Busch
2019-11-22  9:44         ` Ming Lei
2019-11-22  9:57           ` Christoph Hellwig
2019-11-22 10:25             ` Ming Lei
2019-11-22 14:04               ` Jens Axboe [this message]
2019-11-22 21:49                 ` Ming Lei
2019-11-22 21:58                   ` Jens Axboe
2019-11-22 22:30                     ` Ming Lei

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