add swap on a rpi3

[Per olof Ljungmark]

On 07/14/18 19:41, Ian Lepore wrote:
> On Sat, 2018-07-14 at 19:28 +0200, Per olof Ljungmark wrote:
>> 12.0-CURRENT #0 r336134 arm64 GENERIC on a rpi3 Cortex-A53
>>
>> Can I add a swap "partition" somewhere below? I am booting from the
>> SD
>> card and run the system from an attached USB disk.
>>
>> As I understand it, I cannot create a freebsd-swap partition/slice
>> with
>> the BSD/MBR scheme, but is there another way to create a reasonably
>> large swap (>1G) under ARM?
>>
>> =>      63  31116225  mmcsd0  MBR  (15G)
>>         63      2016          - free -  (1.0M)
>>       2079    102312       1  fat32lba  [active]  (50M)
>>     104391  31008825       2  freebsd  (15G)
>>   31113216      3072          - free -  (1.5M)
>>
>> =>       0  31008825  mmcsd0s2  BSD  (15G)
>>          0        57            - free -  (29K)
>>         57  31008768         1  freebsd-ufs  (15G)
>>
>> =>       63  125045361  da0  MBR  (60G)
>>          63       2016       - free -  (1.0M)
>>        2079     102312    1  fat32lba  [active]  (50M)
>>      104391   83884089    2  freebsd  (40G)
>>    83988480   41056944       - free -  (20G)
>>
>> =>       0  83884089  da0s2  BSD  (40G)
>>          0        57         - free -  (29K)
>>         57  83884032      1  freebsd-ufs  (40G)
>>
>>
> 
> Looks like you've got some free space is on da0, so:
> 
>  gpart add -t freebsd -s <slicesize> -i 3 da0
>  gpart create -s bsd da0s3
>  gpart add -t freebsd-swap -s <swapsize> -i 2 da0s3
> 
> Now you have a swap parition at da0s3b (-i 2/partition b is sort of
> traditional for freebsd swap partitions, but there's no real need for
> it to be so).
> 
> You can make the size of da0s3 bigger than 1g, and then carve out just
> 1g of it for swap, leaving space to add ufs partitions in that slice
> later if you want.

Thank you for the quick answer!

I had missed "gpart create -s bsd" part.

Just one more question, why "-i 2" here:
gpart add -t freebsd-swap -s <swapsize> -i 2 da0s3

Could not as well be "-i 1" ?