From: Hannes Reinecke <hare@suse.de>
To: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>, Daniel Wagner <dwagner@suse.de>,
Wen Xiong <wenxiong@us.ibm.com>,
John Garry <john.garry@huawei.com>
Subject: Re: [PATCH 2/2] nvme: pass BLK_MQ_F_NOT_USE_MANAGED_IRQ for fc/rdma/tcp/loop
Date: Wed, 30 Jun 2021 10:15:46 +0200 [thread overview]
Message-ID: <46fdb02d-8d71-d465-072d-5e8d6ec3601f@suse.de> (raw)
In-Reply-To: <20210629074951.1981284-3-ming.lei@redhat.com>
On 6/29/21 9:49 AM, Ming Lei wrote:
> All the 4 host drivers don't use managed irq for completing request, so
> it is correct to pass the flag to blk-mq.
>
> Secondly with this flag, blk-mq will help us dispatch connect request
> allocated via blk_mq_alloc_request_hctx() to driver even though all
> CPU in the specified hctx's cpumask are offline.
>
How is this supposed to work?
To my understanding, only cpus in the hctx cpumask are eligible to send
I/O. So if all of these CPUs are offline, who exactly is submitting I/O?
More to the point, which CPU will be submitting the connect request?
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
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next prev parent reply other threads:[~2021-06-30 8:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-29 7:49 [PATCH 0/2] blk-mq: fix blk_mq_alloc_request_hctx Ming Lei
2021-06-29 7:49 ` [PATCH 1/2] blk-mq: not deactivate hctx if the device doesn't use managed irq Ming Lei
2021-06-29 12:39 ` Hannes Reinecke
2021-06-29 14:17 ` Ming Lei
2021-06-29 15:49 ` John Garry
2021-06-30 0:32 ` Ming Lei
2021-06-30 9:25 ` John Garry
2021-07-01 9:52 ` Christoph Hellwig
2021-06-29 23:30 ` Damien Le Moal
2021-06-30 18:58 ` Sagi Grimberg
2021-06-30 21:57 ` Damien Le Moal
2021-07-01 14:20 ` Keith Busch
2021-06-29 7:49 ` [PATCH 2/2] nvme: pass BLK_MQ_F_NOT_USE_MANAGED_IRQ for fc/rdma/tcp/loop Ming Lei
2021-06-30 8:15 ` Hannes Reinecke [this message]
2021-06-30 8:47 ` Ming Lei
2021-06-30 8:18 ` [PATCH 0/2] blk-mq: fix blk_mq_alloc_request_hctx Hannes Reinecke
2021-06-30 8:42 ` Ming Lei
2021-06-30 9:43 ` Hannes Reinecke
2021-06-30 9:53 ` Ming Lei
2021-06-30 18:59 ` Sagi Grimberg
2021-06-30 19:46 ` Hannes Reinecke
2021-06-30 23:59 ` Ming Lei
2021-07-01 8:00 ` Hannes Reinecke
2021-07-01 9:13 ` Ming Lei
2021-07-02 9:47 ` Daniel Wagner
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