netdev - RE: Re: RTL 8169 linux driver question

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B70BD@saturn3.aculab.com>
Date:	Mon, 26 Nov 2012 09:15:19 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	Stéphane ANCELOT <sancelot@...e.fr>,
	<netdev@...r.kernel.org>
Cc:	<sancelot@...alliance.com>
Subject: RE: Re: RTL 8169  linux driver question

> I had problem with it, my application sends a frame that is immediately
> transmitted back by some slaves, there was abnormally 100us  lost
> between the send and receive call.
> 
> Finally I found it was coming from the following register setup in the
> driver :
> 
> RTL_W16(IntrMitigate, 0x5151);
> 
> Can you give me some details about it, since I do not have the RTL8169
> programming guide.

That sounds like an 'interrupt mitigation' setting - which will cause
RX interrupts to be delayed a short time in order to reduce the
interrupt load on the kernel.

There is usually an 'ethtool' setting to disable interrupt mitigation.

	David



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