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From: Jens Axboe <axboe@kernel.dk>
To: Erwan Velu <e.velu@criteo.com>,
	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 06:33:13 -0600	[thread overview]
Message-ID: <08a0ddec-45b3-bdcb-e428-e17ff55c5382@kernel.dk> (raw)
In-Reply-To: <e41a49a8-f5ea-9f50-0327-dd2af9487153@criteo.com>

On 9/1/21 8:17 AM, Erwan Velu wrote:
> 
> Le 01/09/2021 à 16:05, Erwan Velu a écrit :
>>
>> [...]
>> These numbers are perfect.
>>
>> I rebuild fio on a 5.4 kernel on a high-end nvme which is 1M iops read 
>> capable and got stuck at the same number as you aka 580K iops.
>>
>> So, I'd agree with you something is curious here.
>>
> 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?

-- 
Jens Axboe


  parent reply	other threads:[~2021-09-08 12:33 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 [this message]
2021-09-08 17:11                   ` Erwan Velu
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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