linux-kernel - Re: [PATCH v7 0/3] scsi: ufs: Allow RTT negotiation

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Date: Tue,  4 Jun 2024 22:32:37 -0400
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: Avri Altman <avri.altman@....com>
Cc: "Martin K . Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>, Bean Huo <beanhuo@...ron.com>,
        Peter Wang <peter.wang@...iatek.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 0/3] scsi: ufs: Allow RTT negotiation

On Thu, 30 May 2024 17:25:06 +0300, Avri Altman wrote:

> The rtt-upiu packets precede any data-out upiu packets, thus
> synchronizing the data input to the device: this mostly applies to write
> operations, but there are other operations that requires rtt as well.
> 
> There are several rules binding this rtt - data-out dialog, specifically
> There can be at most outstanding bMaxNumOfRTT such packets.  This might
> have an effect on write performance (sequential write in particular), as
> each data-out upiu must wait for its rtt sibling.
> 
> [...]

Applied to 6.11/scsi-queue, thanks!

[1/3] scsi: ufs: Allow RTT negotiation
      https://git.kernel.org/mkp/scsi/c/9ec54934ce85
[2/3] scsi: ufs: Maximum RTT supported by the host driver
      https://git.kernel.org/mkp/scsi/c/e75ff63300c5
[3/3] scsi: ufs: sysfs: Make max_number_of_rtt read-write
      https://git.kernel.org/mkp/scsi/c/600edc6620a4

-- 
Martin K. Petersen	Oracle Linux Engineering