Hi,
After updating to 6.14.2, the ethernet adapter is almost unusable, I get over 30% packet loss. Bisect says it's this commit:
commit 85f6414167da39e0da30bf370f1ecda5a58c6f7b Author: Vitaly Lifshits vitaly.lifshits@intel.com Date: Thu Mar 13 16:05:56 2025 +0200
e1000e: change k1 configuration on MTP and later platforms
[ Upstream commit efaaf344bc2917cbfa5997633bc18a05d3aed27f ]
Starting from Meteor Lake, the Kumeran interface between the integrated MAC and the I219 PHY works at a different frequency. This causes sporadic MDI errors when accessing the PHY, and in rare circumstances could lead to packet corruption.
To overcome this, introduce minor changes to the Kumeran idle state (K1) parameters during device initialization. Hardware reset reverts this configuration, therefore it needs to be applied in a few places.
Fixes: cc23f4f0b6b9 ("e1000e: Add support for Meteor Lake") Signed-off-by: Vitaly Lifshits vitaly.lifshits@intel.com Tested-by: Avigail Dahan avigailx.dahan@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org
drivers/net/ethernet/intel/e1000e/defines.h | 3 ++ drivers/net/ethernet/intel/e1000e/ich8lan.c | 80 +++++++++++++++++++++++++++-- drivers/net/ethernet/intel/e1000e/ich8lan.h | 4 ++ 3 files changed, 82 insertions(+), 5 deletions(-)
My system is Novacustom V540TU laptop with Intel Core Ultra 5 125H. And the e1000e driver is running in a Xen HVM (with PCI passthrough). Interestingly, I have also another one with Intel Core Ultra 7 155H where the issue does not happen. I don't see what is different about network adapter there, they look identical on lspci (but there are differences about other devices)...
I see the commit above was already backported to other stable branches too...
#regzbot introduced: 85f6414167da39e0da30bf370f1ecda5a58c6f7b