linux-kernel - Re: [PATCH v1 2/3] scsi: ufs: Optimize host lock on transfer requests send/compl paths

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Message-ID: <e7605343-5785-e708-751b-72a66e4e0b67@codeaurora.org>
Date:   Wed, 2 Jun 2021 14:18:37 -0700
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Can Guo <cang@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "hongwus@...eaurora.org" <hongwus@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>
Cc:     Stanley Chu <stanley.chu@...iatek.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Satya Tangirala <satyat@...gle.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 2/3] scsi: ufs: Optimize host lock on transfer requests
 send/compl paths

On 5/28/2021 12:30 AM, Avri Altman wrote:
>>> Hi Bart,
>>> No it's not necessary to serialize both the paths. I think this series
>>> attempts to remove this serialization to a certain degree, which is
>>> what's giving the performance improvement.
> Btw, Is this performance improvement is on top of rq_affinity 2 or 1?
> 
It's on 1.

> Thanks,
> Avri
> 
>>>
>>> Even if multiqueue support would be available in the future, I think
>>> this change is apt now for the current available specification.
>> I agree - this looks like the harbinger of a major change,
>> And going further with respect of hw queues,
>> will need the spec support - e.g. doorbell per lane, etc.
>>
>> Thanks,
>> Avri
>>
>>>> Thanks,
>>>>
>>>> Bart.
>>>>
>>>
>>>
>>> Thanks,
>>> -asd
>>>
>>> --
>>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
>>> Forum,
>>> Linux Foundation Collaborative Project


-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
Linux Foundation Collaborative Project