> "Tom" == Tom Yan 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.
On 13 August 2016 at 04:56, Martin K. Petersen
wrote:
>> "Tom" == Tom Yan writes:
>
> Tom,
>
>>> put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM / (sector_size / 512),
>>> &rbuf[36]);
>
> How many 8-byte ranges fit in a 4096-byte sector?
The thing is, as of ACS-4, blocks that carry DSM/TRIM LB
> "Shaun" == Shaun Tancheff writes:
Shaun,
Shaun> Ah, I think I am understanding now. When the sector size is 4K
Shaun> the minimum page sent with WRITE SAME will be 4K.
Correct. We'll always transfer one logical block of data as required by
the spec.
--
Martin K. Petersen Oracle Lin
On Fri, Aug 12, 2016 at 3:56 PM, Martin K. Petersen
wrote:
>> "Tom" == Tom Yan writes:
>
> Tom,
>
>>> put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM / (sector_size / 512),
>>> &rbuf[36]);
>
> How many 8-byte ranges fit in a 4096-byte sector?
>
> Tom> So were you trying to pointing out somethin
> "Tom" == Tom Yan writes:
Tom,
>> put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM / (sector_size / 512),
>> &rbuf[36]);
How many 8-byte ranges fit in a 4096-byte sector?
Tom> So were you trying to pointing out something I am still missing, or
Tom> were you merely confirming I was right?
I
On 12 August 2016 at 09:34, Martin K. Petersen
wrote:
>> "Tom," == tom ty89 writes:
>
> Tom,
>
> + put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM /
> + (sector_size / 512), &rbuf[36]);
>
> MAXIMUM WRITE SAME LENGTH is in units of the device's logic
> "Tom," == tom ty89 writes:
Tom,
+ put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM /
+ (sector_size / 512), &rbuf[36]);
MAXIMUM WRITE SAME LENGTH is in units of the device's logical block
size.
--
Martin K. Petersen Oracle Linux Engineerin
The patch isn't about how the request from the block layer will be
processed (to form the SCSI commands).
What it addresses is blk_queue_max_write_same_sectors() and
blk_queue_max_discard_sectors() that are called in the SCSI disk
driver. You can see that they are called with an input of the Maxim
On Thu, Aug 11, 2016 at 3:26 AM, wrote:
> From: Tom Yan
>
> Currently we advertise Maximum Write Same Length based on the
> maximum number of sectors that one-block TRIM payload can cover.
> The field are used to derived discard_max_bytes and
> write_same_max_bytes limits in the block layer, whi
From: Tom Yan
Currently we advertise Maximum Write Same Length based on the
maximum number of sectors that one-block TRIM payload can cover.
The field are used to derived discard_max_bytes and
write_same_max_bytes limits in the block layer, which currently can
at max be 0x (32-bit).
Howe
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