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From: Jens Axboe <axboe@kernel.dk>
To: John Garry <john.garry@huawei.com>, linux-block@vger.kernel.org
Cc: "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: Re: [PATCHSET v3] Batched completions
Date: Wed, 20 Oct 2021 08:02:17 -0600	[thread overview]
Message-ID: <27be55bd-2a94-2c11-bf9f-934cefb9dbbe@kernel.dk> (raw)
In-Reply-To: <b47e9ae3-52e0-8cfa-9dcb-bfd46ad4c46d@huawei.com>

On 10/20/21 5:14 AM, John Garry wrote:
> On 17/10/2021 03:06, Jens Axboe wrote:
>> Hi,
> 
> +linux-scsi
> 
>>
>> We now do decent batching of allocations for submit, but we still
>> complete requests individually. This costs a lot of CPU cycles.
>>
>> This patchset adds support for collecting requests for completion,
>> and then completing them as a batch. This includes things like freeing
>> a batch of tags.
>>
>> This version is looking pretty good to me now, and should be ready
>> for 5.16.
> 
> Just wondering if anyone was looking at supporting this for SCSI 
> midlayer? I was thinking about looking at it...

Since it's pretty new, don't think anyone has looked at that yet.
I just did the nvme case, for both submit and complete batching.
But the code is generic and would plug into anything.

-- 
Jens Axboe


      reply	other threads:[~2021-10-20 14:02 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-17  2:06 [PATCHSET v3] Batched completions Jens Axboe
2021-10-17  2:06 ` [PATCH 1/6] block: add a struct io_comp_batch argument to fops->iopoll() Jens Axboe
2021-10-18 10:16   ` Christoph Hellwig
2021-10-17  2:06 ` [PATCH 2/6] sbitmap: add helper to clear a batch of tags Jens Axboe
2021-10-17  2:06 ` [PATCH 3/6] block: add support for blk_mq_end_request_batch() Jens Axboe
2021-10-18 10:18   ` Christoph Hellwig
2021-10-18 13:40     ` Jens Axboe
2021-10-17  2:06 ` [PATCH 4/6] nvme: add support for batched completion of polled IO Jens Axboe
2021-10-18 10:20   ` Christoph Hellwig
2021-10-17  2:06 ` [PATCH 5/6] io_uring: utilize the io batching infrastructure for more efficient " Jens Axboe
2021-10-18 10:20   ` Christoph Hellwig
2021-10-17  2:06 ` [PATCH 6/6] nvme: wire up completion batching for the IRQ path Jens Axboe
2021-10-18 10:22   ` Christoph Hellwig
2021-10-18 13:41     ` Jens Axboe
2021-10-18 15:14       ` Christoph Hellwig
2021-10-18 15:25         ` Jens Axboe
2021-10-20 11:14 ` [PATCHSET v3] Batched completions John Garry
2021-10-20 14:02   ` Jens Axboe [this message]

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