netdev - Re: [REGRESSION] e1000e heavy packet loss on Meteor Lake

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Message-ID: <50da66d0-fe66-0563-4d34-7bd2e25695a4@intel.com>
Date: Mon, 14 Apr 2025 16:04:51 +0300
From: "Lifshits, Vitaly" <vitaly.lifshits@...el.com>
To: Marek Marczykowski-Górecki
	<marmarek@...isiblethingslab.com>
CC: Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, <netdev@...r.kernel.org>,
	<intel-wired-lan@...ts.osuosl.org>, <regressions@...ts.linux.dev>,
	<stable@...r.kernel.org>, Sasha Levin <sashal@...nel.org>
Subject: Re: [REGRESSION] e1000e heavy packet loss on Meteor Lake - 6.14.2



On 4/14/2025 3:58 PM, Marek Marczykowski-Górecki wrote:
> On Mon, Apr 14, 2025 at 03:38:39PM +0300, Lifshits, Vitaly wrote:
>> Do you see the high packet loss without the virtualization?
> 
> I can't check that easily right now, will try later.
> 
>> Can you please share the lspci output?
> 
> Sure:
> 
> 00:07.0 Ethernet controller [0200]: Intel Corporation Device [8086:550a] (rev 20)
> 	Subsystem: CLEVO/KAPOK Computer Device [1558:a743]
> 	Physical Slot: 7
> 	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
> 	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> 	Latency: 64
> 	Interrupt: pin D routed to IRQ 69
> 	Region 0: Memory at f2000000 (32-bit, non-prefetchable) [size=128K]
> 	Capabilities: [c8] Power Management version 3
> 		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> 		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=1 PME-
> 	Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
> 		Address: 00000000fee00000  Data: 0000
> 	Kernel driver in use: e1000e
> 	Kernel modules: e1000e
> 


Do you have mei modules running? Can you try if disabling them make 
things better?

> 
> 
>> Does your switch/link partner support flow control? if it is configurable
>> can you try to enable it?
> 
> It does support it. Enabling it makes things much worse...
> 
>> Do you see any errors in dmesg related to the e1000e driver?
> 
> Not really.
> dmesg | grep 'e1000e\|ens7':
> 
> [    3.088489] e1000e: Intel(R) PRO/1000 Network Driver
> [    3.088512] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
> [    3.093256] e1000e 0000:00:07.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
> [    3.343378] e1000e 0000:00:07.0 0000:00:07.0 (uninitialized): registered PHC clock
> [    3.718946] e1000e 0000:00:07.0 eth0: (PCI Express:2.5GT/s:Width x1) d4:93:90:3e:0d:bb
> [    3.718966] e1000e 0000:00:07.0 eth0: Intel(R) PRO/1000 Network Connection
> [    3.719101] e1000e 0000:00:07.0 eth0: MAC: 16, PHY: 12, PBA No: FFFFFF-0FF
> [    3.759444] e1000e 0000:00:07.0 ens7: renamed from eth0
> [    8.632317] e1000e 0000:00:07.0 ens7: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
> [  239.458205] e1000e 0000:00:07.0 ens7: NIC Link is Down
> [  242.485869] e1000e 0000:00:07.0 ens7: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
> 
> (you can also see a test with flow control above)
> 
> 
> And also ethtool output if useful:
> Settings for ens7:
> 	Supported ports: [ TP ]
> 	Supported link modes:   10baseT/Half 10baseT/Full
> 	                        100baseT/Half 100baseT/Full
> 	                        1000baseT/Full
> 	Supported pause frame use: Symmetric Receive-only
> 	Supports auto-negotiation: Yes
> 	Supported FEC modes: Not reported
> 	Advertised link modes:  10baseT/Half 10baseT/Full
> 	                        100baseT/Half 100baseT/Full
> 	                        1000baseT/Full
> 	Advertised pause frame use: Symmetric Receive-only
> 	Advertised auto-negotiation: Yes
> 	Advertised FEC modes: Not reported
> 	Link partner advertised link modes:  10baseT/Half 10baseT/Full
> 	                                     100baseT/Half 100baseT/Full
> 	                                     1000baseT/Full
> 	Link partner advertised pause frame use: No
> 	Link partner advertised auto-negotiation: Yes
> 	Link partner advertised FEC modes: Not reported
> 	Speed: 1000Mb/s
> 	Duplex: Full
> 	Auto-negotiation: on
> 	Port: Twisted Pair
> 	PHYAD: 1
> 	Transceiver: internal
> 	MDI-X: on (auto)
> 	Supports Wake-on: d
> 	Wake-on: d
>          Current message level: 0x00000007 (7)
>                                 drv probe link
> 	Link detected: yes
> 
>