linux-kernel - Re: Debug scsi message in linux 4.19.31

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Message-ID: <yq15zs73jm0.fsf@oracle.com>
Date:   Sun, 24 Mar 2019 20:04:07 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Hussam Al-Tayeb <ht990332@....com>, linux-kernel@...r.kernel.org,
        linux-scsi <linux-scsi@...r.kernel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: Debug scsi message in linux 4.19.31

Randy,

>> Mar 23 17:40:10 hades kernel: sd 0:0:0:0: [sda] Optimal transfer size 0
>> bytes < PAGE_SIZE (4096 bytes)

We're just trying to weed out the devices that report garbage in this
field. But of course none of the devices I tested with put 0 in there.

>> Does it really belong in an LTS kernel?

The patch does fix problems for devices that report a nonsensical
value. But it is a regression that it now prints a warning for devices
that don't report an optimal I/O size at all.

Sorry about that. Will fix tomorrow!

-- 
Martin K. Petersen	Oracle Linux Engineering