From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lino Sanfilippo Subject: Re: stmmac ethernet in kernel 4.4: coalescing related pauses? Date: Mon, 28 Nov 2016 18:01:10 +0100 Message-ID: <279bb203-486f-7086-e232-ed3e1cb0af2f@marvell.com> References: <20161128.095431.856183735501262965.davem@davemloft.net> <1480347103.18162.58.camel@edumazet-glaptop3.roam.corp.google.com> <920b1148-a77d-0b69-01b0-b14bcbdf8648@marvell.com> <20161128.113031.964579744326063048.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Cc: , , , , To: David Miller Return-path: In-Reply-To: <20161128.113031.964579744326063048.davem@davemloft.net> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On 28.11.2016 17:30, David Miller wrote: > From: Lino Sanfilippo > Date: Mon, 28 Nov 2016 16:57:35 +0100 > >> I wonder if the best fix would be indeed to deactivate irq coalescing >> completely. >> Does it make any sense at all to use it if a driver uses NAPI already? > > It absolutely does make sense, when it is implemented and functions > properly. > Interesting. I always thought both (NAPI and irq coalescing) are essentially doing the same thing only one time in software and one time with hw support. Did I misunderstand NAPI? Regards, Lino