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

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Message-ID: <Z_0GYR8jR-5NWZ9K@mail-itl>
Date: Mon, 14 Apr 2025 14:58:09 +0200
From: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
To: "Lifshits, Vitaly" <vitaly.lifshits@...el.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 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



> 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


-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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