> On 4 Mar 2019, at 14.04, Igor Konopko <[email protected]> wrote:
>
>
>
>> On 04.03.2019 13:22, Hans Holmberg wrote:
>>> On Mon, Mar 4, 2019 at 12:44 PM Javier González <[email protected]> wrote:
>>>
>>>
>>>
>>>> On 4 Mar 2019, at 12.30, Hans Holmberg <[email protected]> wrote:
>>>>
>>>> On Mon, Mar 4, 2019 at 10:05 AM Javier González <[email protected]> wrote:
>>>>>> On 27 Feb 2019, at 18.14, Igor Konopko <[email protected]> wrote:
>>>>>>
>>>>>> Current lightnvm and pblk implementation does not care
>>>>>> about NVMe max data transfer size, which can be smaller
>>>>>> than 64*K=256K. This patch fixes issues related to that.
>>>>
>>>> Could you describe *what* issues you are fixing?
>
> I'm fixing the issue related to controllers which NVMe max data transfer size
> is lower that 256K (for example 128K, which happens for existing NVMe
> controllers and NVMe spec compliant). Such a controllers are not able to
> handle command which contains 64 PPAs, since the the size of DMAed buffer
> will be above the capabilities of such a controller.
>
OK. Then let’s try to get support for this ASAP. If the rest agree on a feature
bit then it should be straightforward. If not, let’s at least add a warning if
MDTS < 64 so that people are able to identify where the missing performance
went when updating the kernel if they are not using MDTS on their OCSSD
implementations.
Javier
