From: Troy Kisky <troy.ki...@boundarydevices.com> Sent: Wednesday, April 06, 2016 10:26 AM > To: netdev@vger.kernel.org; da...@davemloft.net; Fugang Duan > <fugang.d...@nxp.com>; lzn...@gmail.com > Cc: Fabio Estevam <fabio.este...@nxp.com>; l.st...@pengutronix.de; > and...@lunn.ch; trem...@gmail.com; g...@uclinux.org; linux-arm- > ker...@lists.infradead.org; johan...@sipsolutions.net; > stillcompil...@gmail.com; sergei.shtyl...@cogentembedded.com; > a...@arndb.de; Troy Kisky <troy.ki...@boundarydevices.com> > Subject: [PATCH net-next V3 05/16] net: fec: reduce interrupts > > By clearing the NAPI interrupts in the NAPI routine and not in the interrupt > handler, we can reduce the number of interrupts. We also don't need any status > variables as the registers are still valid. > > Also, notice that if budget pkts are received, the next call to > fec_enet_rx_napi > will now continue to receive the previously pending packets. > > To test that this actually reduces interrupts, try this command before/after > patch > > cat /proc/interrupts |grep ether; \ > ping -s2800 192.168.0.201 -f -c1000 ; \ > cat /proc/interrupts |grep ether > > For me, before this patch is 2996 interrupts. > After patch is 2010 interrupts. > > Signed-off-by: Troy Kisky <troy.ki...@boundarydevices.com> >
As my previous comments on V2, if you want to improve performance, you can try to separate tx and rx napi process like calling netif_tx_napi_add() to initialize tx NAPI context.
