Rajkumar Manoharan <rmanohar@xxxxxxxxxxxxxxxx> wrote: > Add NAPI support for rx and tx completion. NAPI poll is scheduled > from interrupt handler. The design is as below > > - on interrupt > - schedule napi and mask interrupts > - on poll > - process all pipes (no actual Tx/Rx) > - process Rx within budget > - if quota exceeds budget reschedule napi poll by returning budget > - process Tx completions and update budget if necessary > - process Tx fetch indications (pull-push) > - push any other pending Tx (if possible) > - before resched or napi completion replenish htt rx ring buffer > - if work done < budget, complete napi poll and unmask interrupts > > This change also get rid of two tasklets (intr_tq and txrx_compl_task). > > Measured peak throughput with NAPI on IPQ4019 platform in controlled > environment. No noticeable reduction in throughput is seen and also > observed improvements in CPU usage. Approx. 15% CPU usage got reduced > in UDP uplink case. > > DL: AP DUT Tx > UL: AP DUT Rx > > IPQ4019 (avg. cpu usage %) > > ======== > TOT +NAPI > =========== ============= > TCP DL 644 Mbps (42%) 645 Mbps (36%) > TCP UL 673 Mbps (30%) 675 Mbps (26%) > UDP DL 682 Mbps (49%) 680 Mbps (49%) > UDP UL 720 Mbps (28%) 717 Mbps (11%) > > Signed-off-by: Rajkumar Manoharan <rmanohar@xxxxxxxxxxxxxxxx> This is quite big change and I'm planning to queue this for 4.9. So I'm not applying this quite yet. -- Sent by pwcli https://patchwork.kernel.org/patch/9199911/ -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
