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Date: Wed, 02 Sep 2015 16:00:36 +0200
From: =?windows-1252?Q?St=E9phane_ANCELOT?= <sancelot@free.fr>
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Subject: Re: [Xenomai] rt_e1000e driver issues
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>

On 01/09/2015 12:20, Gilles Chanteperdrix wrote:
> On Mon, Aug 31, 2015 at 08:30:03PM +0200, Gilles Chanteperdrix wrote:
>> On Mon, Aug 31, 2015 at 04:04:18PM +0200, St=E9phane ANCELOT wrote:
>>> Hi,
>>>
>>> I am checking timing issues of realtime rtnet frames in my application.
>>> Timing to send a frame is  convenient.
>>> but I have some issues with the time to receive the frames.
>>>
>>> Although the RxDelays are cleared, the frame is received almost 175us l=
ater
>>> than it should in comparison with a rt8169 driver (v2.6 version) and the
>>> same application.
>>>
>>> Any idea where to look at first ?
>> modinfo rt_e1000e
> Actually, the module parameters are the same as the Linux driver,
> so, they are documented in Documentation/networking/e1000e.txt in
> the Linux kernel sources, here for instance:
> https://git.xenomai.org/ipipe.git/tree/Documentation/networking/e1000e.tx=
t?id=3Dv4.2-rc1
> (beware that the driver versions are not the same, so, there may be
> some differences, like default values, or even some options, but
> modinfo will tell you that).
>
> Your problem is probably that you should disable interrupt
> throttling passing InterruptThrottleRate=3D0.
>
Hi,
I checked the timerdelays settings everything seems rigth by default.
However,  I think the main differences I mesure are related to the usage=20
of EarlyReceive in r8169 driver. Thus spending less time in recv func .

I will soon check the same application using the igb driver

Regards
S.Ancelot