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From: Erwan Velu <e.velu@criteo.com>
To: Jens Axboe <axboe@kernel.dk>,
	Hans-Peter Lehmann <hans-peter.lehmann@kit.edu>,
	"fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: Question: t/io_uring performance
Date: Wed, 8 Sep 2021 19:11:06 +0200	[thread overview]
Message-ID: <9b72cfc0-c4e7-3ece-1f66-21b66d45d565@criteo.com> (raw)
In-Reply-To: <08a0ddec-45b3-bdcb-e428-e17ff55c5382@kernel.dk>


Le 08/09/2021 à 14:33, Jens Axboe a écrit :
> [..]
>> Same on a 5.10.35.
>>
>> Jens, did we missed something here ?
> Read through the actual thread. It seriously sounds like the system is
> hitting bandwidth limits, which is very odd. 580K is not very much. Just
> curious, does it change anything if you use 512b blocks instead?
>
That's clearly way better !


With default kernel config :

1 device : 512b : 674K

1 device: 512b + nomerge + nostats : 745K

1 device: 512b + nomerge + nostats + nopoll : 770K

2 devices, 2 thread + nopoll : taskset -c 0,1 t/io_uring -b512 -d128 
-c32 -s32 -p0 -F1 -B1 -n2 /dev/nvme2n1 /dev/nvme3n1 : 1.57M


Enabling 32 poll queues:

1 device: 512b: 884K

1 device: 512b + nostats : 915K

1 device: 512b + nomerge + nostats + nopoll : 715K

2 devices, 2 thread nostats : taskset -c 0,1 t/io_uring -b512 -d128 -c32 
-s32 -p1 -F1 -B1 -n2 /dev/nvme2n1 /dev/nvme3n1 : 1.84M

3 devices, 2 threads nostats : 2.2M

3 devices, 3 threads nostats : 2.8M

4 devices, 3 threads nostats 3.1M

4 devices, 4 threads nostats: 3.8M


Thanks for the insights !

Erwan,



  reply	other threads:[~2021-09-08 17:11 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25 15:57 Question: t/io_uring performance Hans-Peter Lehmann
2021-08-26  7:27 ` Erwan Velu
2021-08-26 15:57   ` Hans-Peter Lehmann
2021-08-27  7:20     ` Erwan Velu
2021-09-01 10:36       ` Hans-Peter Lehmann
2021-09-01 13:17         ` Erwan Velu
2021-09-01 14:02           ` Hans-Peter Lehmann
2021-09-01 14:05             ` Erwan Velu
2021-09-01 14:17               ` Erwan Velu
2021-09-06 14:26                 ` Hans-Peter Lehmann
2021-09-06 14:41                   ` Erwan Velu
2021-09-08 11:53                   ` Sitsofe Wheeler
2021-09-08 12:22                     ` Jens Axboe
2021-09-08 12:41                       ` Jens Axboe
2021-09-08 16:12                         ` Hans-Peter Lehmann
2021-09-08 16:20                           ` Jens Axboe
2021-09-08 21:24                             ` Hans-Peter Lehmann
2021-09-08 21:34                               ` Jens Axboe
2021-09-10 11:25                                 ` Hans-Peter Lehmann
2021-09-10 11:45                                   ` Erwan Velu
2021-09-08 12:33                 ` Jens Axboe
2021-09-08 17:11                   ` Erwan Velu [this message]
2021-09-08 22:37                     ` Erwan Velu
2021-09-16 21:18                       ` Erwan Velu
2021-09-21  7:05                         ` Erwan Velu
2021-09-22 14:45                           ` Hans-Peter Lehmann

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