From: axboe@kernel.dk (Jens Axboe)
Subject: [LSF/MM TOPIC] NVMe Performance: Userspace vs Kernel
Date: Fri, 15 Feb 2019 18:54:35 -0700 [thread overview]
Message-ID: <5a370041-bd59-049f-3cb4-7635dedac8f8@kernel.dk> (raw)
In-Reply-To: <11A6C7D0-A26D-410F-8EE3-9AF524DF2050@nutanix.com>
(resending, as my phone email client turned this into html crap)
> Hi Bart,
>
> I configured 5.0-rc6 and had a look at the io_uring code. Finally worked out how to use FIO's t/io_uring to submit IO and poll completions without system calls. My _initial_ numbers still show SPDK being faster and more efficient.
>
> Searching the lists, I found a few mentions that Jens published a comparison stating otherwise, but I can't find it. Could you please give me some pointers?
I posted some numbers with v5:
https://lore.kernel.org/linux-block/20190116175003.17880-1-axboe at kernel.dk/
Sounds like you are using sqpoll, you probably don?t want to do that for
peak performance. And you probably want to experiment a bit to reach the
best performance, both in terms of setup/placement and kernel
configuration, runtime options (like iostats), etc.
--
Jens Axboe
next prev parent reply other threads:[~2019-02-16 1:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-15 21:19 [LSF/MM TOPIC] NVMe Performance: Userspace vs Kernel Felipe Franciosi
2019-02-15 21:41 ` Bart Van Assche
[not found] ` <11A6C7D0-A26D-410F-8EE3-9AF524DF2050@nutanix.com>
2019-02-16 1:01 ` Bart Van Assche
2019-02-16 1:54 ` Jens Axboe [this message]
2019-02-15 21:47 ` Keith Busch
2019-02-15 22:14 ` Felipe Franciosi
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