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

Hannes Reinecke
2017-01-11T15:17:00Z

On 01/11/2017 04:07 PM, Jens Axboe 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.
>
Indeed; some drivers like lpfc already _have_ a polling mode, but not
hooked up to blk-iopoll. Would be really cool to get that going.

Cheers,

Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
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