linux-kernel - Re: stmmac ethernet in kernel 4.4: coalescing related pauses?

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Message-ID: <279bb203-486f-7086-e232-ed3e1cb0af2f@marvell.com>
Date:   Mon, 28 Nov 2016 18:01:10 +0100
From:   Lino Sanfilippo <lsanfil@...vell.com>
To:     David Miller <davem@...emloft.net>
CC:     <eric.dumazet@...il.com>, <pavel@....cz>, <peppe.cavallaro@...com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: stmmac ethernet in kernel 4.4: coalescing related pauses?



On 28.11.2016 17:30, David Miller wrote:
> From: Lino Sanfilippo <lsanfil@...vell.com>
> 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