Re: [LSF/MM TOPIC][LSF/MM ATTEND] NAPI polling for block drivers

Ming Lei
2017-01-19T10:57:46Z

On Wed, Jan 11, 2017 at 11:07 PM, Jens Axboe <axboe@kernel.dk> wrote:
> On 01/11/2017 06:43 AM, Johannes Thumshirn wrote:
>> Hi all,
>>
>> I'd like to attend LSF/MM and would like to discuss polling for block drivers.
>>
>> Currently there is blk-iopoll but it is neither as widely used as NAPI in the
>> networking field and accoring to Sagi's findings in [1] performance with
>> polling is not on par with IRQ usage.
>>
>> On LSF/MM I'd like to whether it is desirable to have NAPI like polling in
>> more block drivers and how to overcome the currently seen performance issues.
>
> It would be an interesting topic to discuss, as it is a shame that blk-iopoll
> isn't used more widely.

I remembered that Keith and I discussed some issues of blk-iopoll:

http://marc.info/?l=linux-block&m=147576999016407&w=2

seems which isn't addressed yet.

Thanks,
Ming Lei