Re: [GIT PULL 18/25] lightnvm: set target over-provision on create ioctl

[Javier Gonzalez]

> On 5 Jan 2018, at 20.33, Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
> 
> On 01/05/2018 05:16 AM, Matias BjÃrling wrote:
>> From: Javier GonzÃlez <javier@xxxxxxxxxxxx>
>> 
>> Allow to set the over-provision percentage on target creation. In case
>> that the value is not provided, fall back to the default value set by
>> the target.
>> 
>> In pblk, set the default OP to 11% of the total size of the device
> 
>> +#define PBLK_DEFAULT_OP (11)
> 
> Hi,
> Just curious -- where does 11 come from?  Is it a spec value?

11 stands for 11% over-provisioning for the media to allow garbage
collection. Different SSDs have different values based on the targeted
workload - 11% is a common default value for standard drives.

The spec. does not specify any default values of over-provisioning.

Javier.

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