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, Stéphane 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 later
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.txt?id=v4.2-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=0.
Hi,
I checked the timerdelays settings everything seems rigth by default.
However, I think the main differences I mesure are related to the usage
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
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