From: Kanchan Joshi <joshi.k@samsung.com>
To: Keith Busch <kbusch@meta.com>
Cc: linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
axboe@kernel.dk, hch@lst.de, xiaoguang.wang@linux.alibaba.com,
Keith Busch <kbusch@kernel.org>
Subject: Re: [RFC 0/3] nvme uring passthrough diet
Date: Tue, 2 May 2023 00:31:28 +0530 [thread overview]
Message-ID: <20230501190109.GA14341@green245> (raw)
In-Reply-To: <20230501153306.537124-1-kbusch@meta.com>
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On Mon, May 01, 2023 at 08:33:03AM -0700, Keith Busch wrote:
>From: Keith Busch <kbusch@kernel.org>
>
>When you disable all the optional features in your kernel config and
>request queue, it looks like the normal request dispatching is just as
>fast as any attempts to bypass it.
Did a quick run, and it is not the case.
For that workload [1], this one moves to 3.4M from 3M.
While pure bypass moved to 5M from 3M. Maybe it could have gone higher
than 5M (which was the HW limit); have not checked that part yet.
[1]
# t/io_uring -b512 -d64 -c2 -s2 -p1 -F1 -B1 -O0 -n1 -u1 -r4 -k0 /dev/ng0n1
submitter=0, tid=2935, file=/dev/ng0n1, node=-1
polled=1, fixedbufs=1/0, register_files=1, buffered=1, register_queues=0 QD=64
Engine=io_uring, sq_ring=64, cq_ring=64
IOPS=3.31M, BW=1616MiB/s, IOS/call=2/1
IOPS=3.36M, BW=1642MiB/s, IOS/call=2/2
IOPS=3.40M, BW=1661MiB/s, IOS/call=2/1
Exiting on timeout
Maximum IOPS=3.40M
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next prev parent reply other threads:[~2023-05-01 19:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20230501154403epcas5p388c607114ad6f9d20dfd3ec958d88947@epcas5p3.samsung.com>
2023-05-01 15:33 ` [RFC 0/3] nvme uring passthrough diet Keith Busch
2023-05-01 15:33 ` [RFC 1/3] nvme: skip block cgroups for passthrough commands Keith Busch
2023-05-03 5:04 ` Christoph Hellwig
2023-05-03 15:25 ` Keith Busch
2023-05-15 15:47 ` Keith Busch
2023-05-01 15:33 ` [RFC 2/3] nvme: fix cdev name leak Keith Busch
2023-05-01 15:33 ` [RFC 3/3] nvme: create special request queue for cdev Keith Busch
2023-05-02 12:20 ` Johannes Thumshirn
2023-05-03 5:04 ` Christoph Hellwig
2023-05-03 14:56 ` Keith Busch
2023-05-01 19:01 ` Kanchan Joshi [this message]
2023-05-01 19:31 ` [RFC 0/3] nvme uring passthrough diet Keith Busch
2023-05-03 7:27 ` Kanchan Joshi
2023-05-03 15:20 ` Keith Busch
2023-05-05 8:14 ` Kanchan Joshi
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