Am 21.02.2019 um 18:46 schrieb Jerome Brunet: > On Thu, 2019-02-21 at 18:27 +0100, Simon Huelck wrote: >> Hi, >> >> >> >> this was changed recently, with a patch for the EEE stuff , see here: >> >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.0-rc7&id=e35e26b26e955c53e61c154ba26b9bb15da6b858 > Hu, I was not aware this finally went through. Good ! > As explained in the patch and by Jose, the GMAC should be using IRQ_LEVEL. > > The realtek PHY has EEE enabled by default. Having this enabled generates a > lot of (Low Power) Interrupts. > > Previously, when the GMAC used IRQ_EDGE. Because it is wrong, we would > eventually miss an IRQ and the interface would just die. Unfortunately, it was > not that easy find out. > > 2 years ago, we just noticed that disabling EEE would make the failure go > away. Forcing this EEE feature off through DT was merely a work around. > > Now that the real cause of the problem is known, there is no reason to keep > this hack around. > > Whether EEE adds a performance penality and why, is another topic. > As Jose pointed out, you can disable EEE at runtime, using ethtool. > > Jerome > Hi,
i disabled EEE via ethtool and via the .dtb , but the performance penalty stays. Kernel 4.14 still gives me the former "good" performance. regards, Simon
