From: Jens Axboe <[email protected]>
To: Kanchan Joshi <[email protected]>,
[email protected], [email protected], [email protected]
Cc: [email protected], [email protected],
[email protected], [email protected]
Subject: Re: [PATCH for-next v3 0/4] fixed-buffer for uring-cmd/passthrough
Date: Fri, 2 Sep 2022 10:06:33 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 9/2/22 9:16 AM, Kanchan Joshi wrote:
> Hi,
>
> Currently uring-cmd lacks the ability to leverage the pre-registered
> buffers. This series adds the support in uring-cmd, and plumbs
> nvme passthrough to work with it.
>
> Using registered-buffers showed peak-perf hike from 1.85M to 2.17M IOPS
> in my setup.
>
> Without fixedbufs
> *****************
> # taskset -c 0 t/io_uring -b512 -d128 -c32 -s32 -p0 -F1 -B0 -O0 -n1 -u1 /dev/ng0n1
> submitter=0, tid=5256, file=/dev/ng0n1, node=-1
> polled=0, fixedbufs=0/0, register_files=1, buffered=1, QD=128
> Engine=io_uring, sq_ring=128, cq_ring=128
> IOPS=1.85M, BW=904MiB/s, IOS/call=32/31
> IOPS=1.85M, BW=903MiB/s, IOS/call=32/32
> IOPS=1.85M, BW=902MiB/s, IOS/call=32/32
> ^CExiting on signal
> Maximum IOPS=1.85M
With the poll support queued up, I ran this one as well. tldr is:
bdev (non pt) 122M IOPS
irq driven 51-52M IOPS
polled 71M IOPS
polled+fixed 78M IOPS
Looking at profiles, it looks like the bio is still being allocated
and freed and not dipping into the alloc cache, which is using a
substantial amount of CPU. I'll poke a bit and see what's going on...
--
Jens Axboe
next prev parent reply other threads:[~2022-09-02 16:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220902152701epcas5p1d4aca8eebc90fb96ac7ed5a8270816cf@epcas5p1.samsung.com>
2022-09-02 15:16 ` [PATCH for-next v3 0/4] fixed-buffer for uring-cmd/passthrough Kanchan Joshi
[not found] ` <CGME20220902152706epcas5p11f1a11710a6ba985f4679a5cfe131bf8@epcas5p1.samsung.com>
2022-09-02 15:16 ` [PATCH for-next v3 1/4] io_uring: introduce io_uring_cmd_import_fixed Kanchan Joshi
[not found] ` <CGME20220902152709epcas5p1a1bd433cac6040c492e347edae484ca5@epcas5p1.samsung.com>
2022-09-02 15:16 ` [PATCH for-next v3 2/4] io_uring: introduce fixed buffer support for io_uring_cmd Kanchan Joshi
2022-09-02 23:13 ` Jens Axboe
[not found] ` <CGME20220902152712epcas5p2622e861ac4a5ae9820a9af9442d556b4@epcas5p2.samsung.com>
2022-09-02 15:16 ` [PATCH for-next v3 3/4] block: add helper to map bvec iterator for passthrough Kanchan Joshi
2022-09-02 23:14 ` Jens Axboe
[not found] ` <CGME20220902152717epcas5p26905ce7cb48e9d278976a301d73c297f@epcas5p2.samsung.com>
2022-09-02 15:16 ` [PATCH for-next v3 4/4] nvme: wire up fixed buffer support for nvme passthrough Kanchan Joshi
2022-09-02 16:06 ` Jens Axboe [this message]
2022-09-02 16:32 ` [PATCH for-next v3 0/4] fixed-buffer for uring-cmd/passthrough Jens Axboe
2022-09-02 18:46 ` Kanchan Joshi
2022-09-02 19:32 ` Jens Axboe
2022-09-02 21:25 ` Jens Axboe
2022-09-03 9:34 ` Kanchan Joshi
2022-09-03 17:00 ` Jens Axboe
2022-09-04 17:01 ` Kanchan Joshi
2022-09-04 20:17 ` Jens Axboe
2022-09-05 5:52 ` Kanchan Joshi
2022-09-05 17:48 ` Jens Axboe
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