From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Tom Yan <tom.ty89@gmail.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Tejun Heo <tj@kernel.org>,
Shaun Tancheff <shaun.tancheff@seagate.com>,
Shaun Tancheff <shaun@tancheff.com>,
linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-block@vger.kernel.org
Subject: Re: [RFC] libata-scsi: make sure Maximum Write Same Length is not too large
Date: Tue, 16 Aug 2016 00:15:15 -0400 [thread overview]
Message-ID: <yq18tvxl57w.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <CAGnHSEnycyCRy=SHXs+fQx8mwaQwLtAKO1thH6yYscbBkL2+VQ@mail.gmail.com> (Tom Yan's message of "Sun, 14 Aug 2016 17:23:45 +0800")
>>>>> "Tom" == Tom Yan <tom.ty89@gmail.com> writes:
Tom,
Tom> The thing is, as of ACS-4, blocks that carry DSM/TRIM LBA Range
Tom> Entries are always 512-byte.
Lovely. And SAT conveniently ignores this entirely.
Tom> Honestly, I have no idea how that would work on a 4Kn SSD, if it is
Tom> / will ever be a thing.
Highly unlikely.
But I guess you would have to report 8 512-byte ranges in the 4Kn
case. And then rely on the patch we talked about to clamp the number of
sectors based on the block layer limit.
--
Martin K. Petersen Oracle Linux Engineering
prev parent reply other threads:[~2016-08-16 4:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-11 8:26 [RFC] libata-scsi: make sure Maximum Write Same Length is not too large tom.ty89
2016-08-11 17:04 ` Shaun Tancheff
2016-08-11 21:17 ` Tom Yan
2016-08-12 1:34 ` Martin K. Petersen
2016-08-12 5:02 ` Tom Yan
2016-08-12 20:56 ` Martin K. Petersen
2016-08-12 21:49 ` Shaun Tancheff
2016-08-12 22:15 ` Martin K. Petersen
2016-08-14 9:23 ` Tom Yan
2016-08-16 4:15 ` Martin K. Petersen [this message]
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