From: Jens Axboe <axboe@kernel.dk>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-nvme@lists.infradead.org
Subject: Re: [PATCHSET 0/5] Enable alloc caching and batched freeing for passthrough
Date: Fri, 23 Sep 2022 09:19:15 -0600 [thread overview]
Message-ID: <6f7600be-d4b9-aeac-7dd1-71992a4dd5e8@kernel.dk> (raw)
In-Reply-To: <Yy3NyACongSfayY+@infradead.org>
On 9/23/22 9:16 AM, Christoph Hellwig wrote:
> On Thu, Sep 22, 2022 at 12:28:00PM -0600, Jens Axboe wrote:
>> This is good for a 10% improvement for passthrough performance. For
>> a non-drive limited test case, passthrough IO is now more efficient
>> than the regular bdev O_DIRECT path.
>
> How so? If it ends up faster we are doing something wrong in the
> normal path as there should be no fundamental difference in the work
> that is being done.
There's no fundamental difference, but the bdev path is more involved
than the simple passthrough path.
--
Jens Axboe
next prev parent reply other threads:[~2022-09-23 15:19 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 18:28 [PATCHSET 0/5] Enable alloc caching and batched freeing for passthrough Jens Axboe
2022-09-22 18:28 ` [PATCH 1/5] block: enable batched allocation for blk_mq_alloc_request() Jens Axboe
2022-09-23 14:52 ` Pankaj Raghav
2022-09-23 15:13 ` Pankaj Raghav
2022-09-23 20:54 ` Jens Axboe
2022-09-24 0:59 ` Damien Le Moal
2022-09-24 1:01 ` Jens Axboe
2022-09-24 1:22 ` Damien Le Moal
2022-09-24 11:56 ` Pankaj Raghav
2022-09-24 14:44 ` Jens Axboe
2022-09-22 18:28 ` [PATCH 2/5] block: change request end_io handler to pass back a return value Jens Axboe
2022-09-22 18:28 ` [PATCH 3/5] block: allow end_io based requests in the completion batch handling Jens Axboe
2022-09-22 18:28 ` [PATCH 4/5] nvme: split out metadata vs non metadata end_io uring_cmd completions Jens Axboe
2022-09-23 15:21 ` Christoph Hellwig
2022-09-23 20:52 ` Jens Axboe
2022-09-26 14:41 ` Christoph Hellwig
2022-09-26 14:41 ` Jens Axboe
2022-09-26 14:43 ` Christoph Hellwig
2022-09-26 14:50 ` Jens Axboe
2022-09-26 14:52 ` Christoph Hellwig
2022-09-26 14:54 ` Jens Axboe
2022-09-22 18:28 ` [PATCH 5/5] nvme: enable batched completions of passthrough IO Jens Axboe
2022-09-23 15:16 ` [PATCHSET 0/5] Enable alloc caching and batched freeing for passthrough Christoph Hellwig
2022-09-23 15:19 ` Jens Axboe [this message]
2022-09-23 15:21 ` Christoph Hellwig
2022-09-23 15:22 ` Jens Axboe
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