Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <e7e4cf5c-c09d-7747-b466-cef6673f2f10@sapience.com>
Date:   Sun, 23 Jul 2023 06:55:49 -0400
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH 6.4 800/800] io_uring: Use io_schedule* in cqring wait
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Oleksandr Natalenko <oleksandr@natalenko.name>
Cc:     stable@vger.kernel.org, Pavel Begunkov <asml.silence@gmail.com>,
        io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
        Andres Freund <andres@anarazel.de>,
        Jens Axboe <axboe@kernel.dk>
References: <20230716194949.099592437@linuxfoundation.org>
 <20230716195007.731909670@linuxfoundation.org>
 <12251678.O9o76ZdvQC@natalenko.name>
 <2023072310-superman-frosted-7321@gregkh>
Content-Language: en-US
From:   Genes Lists <lists@sapience.com>
In-Reply-To: <2023072310-superman-frosted-7321@gregkh>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk

On 7/23/23 06:50, Greg Kroah-Hartman wrote:
> On Sun, Jul 23, 2023 at 11:39:42AM +0200, Oleksandr Natalenko wrote:
>> Hello.
>>
>> On neděle 16. července 2023 21:50:53 CEST Greg Kroah-Hartman wrote:
>>> From: Andres Freund <andres@anarazel.de>
>>>
>>> commit 8a796565cec3601071cbbd27d6304e202019d014 upstream.
>>>
>>> I observed poor performance of io_uring compared to synchronous IO. That
...
>>
>> Reportedly, this caused a regression as reported in [1] [2] [3]. Not only v6.4.4 is affected, v6.1.39 is affected too.
>>
>> Reverting this commit fixes the issue.
>>
>> Please check.
> 
> Is this also an issue in 6.5-rc2?
> 
> thanks,
> 
> greg k-h

Yes - I can confirm this issue is in 6.5-rc2 and with Linus' commit 
c2782531397f5cb19ca3f8f9c17727f1cdf5bee8.


gene