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Subject5.4 Regression in r8169 with jumbo frames - packet loss/delays

I have a Realtek ethernet interface (rtl8168e ?) using the r8169 driver

It uses Jumbo frames (6000 bytes) and has a bridge on it.

With 5.4 I saw repeated packet loss / very long delays. Also with 5.4.1.

There were also some kernel messages at about the same time as the
pings stopped: "r8169 transmit queue timed out".

I was unable to reproduce the issue on another system with a different
network card.

I've run a fairly targeted bisect - see below.

If there is any more information I can provide, or testing to be done
I'll be glad to help.

Regards
Alan


git bisect start '--' 'drivers/net/ethernet/realtek'
# good: [b8e167066e85c9e1e9c5d27b82a858d96e6ba22c] Linux 5.3.14
git bisect good b8e167066e85c9e1e9c5d27b82a858d96e6ba22c
# bad: [219d54332a09e8d8741c1e1982f5eae56099de85] Linux 5.4
git bisect bad 219d54332a09e8d8741c1e1982f5eae56099de85
# good: [4d856f72c10ecb060868ed10ff1b1453943fc6c8] Linux 5.3
git bisect good 4d856f72c10ecb060868ed10ff1b1453943fc6c8
# good: [2e779ddb5617928ee09842758c4734682264279d] r8169: use the generic EEE management functions
git bisect good 2e779ddb5617928ee09842758c4734682264279d
# good: [ae84bc18733752e9bf47227bd80b3c0f3649b8d0] r8169: don't use bit LastFrag in tx descriptor after send
git bisect good ae84bc18733752e9bf47227bd80b3c0f3649b8d0
# good: [dc161162e42ca51daff50e86a4a4bb8395d60501] r8169: don't set bit RxVlan on RTL8125
git bisect good dc161162e42ca51daff50e86a4a4bb8395d60501
# bad: [4ebcb113edcc498888394821bca2e60ef89c6ff3] r8169: fix jumbo packet handling on resume from suspend
git bisect bad 4ebcb113edcc498888394821bca2e60ef89c6ff3
# good: [299d14d4c31aff3b37a03894e012edf8421676ee] Merge tag 'pci-v5.4-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
git bisect good 299d14d4c31aff3b37a03894e012edf8421676ee
# first bad commit: [4ebcb113edcc498888394821bca2e60ef89c6ff3] r8169: fix jumbo packet handling on resume from suspend


2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6000 qdisc pfifo_fast master br0 state UP mode DEFAULT group default qlen 1000
link/ether 90:2b:34:9d:ed:6f brd ff:ff:ff:ff:ff:ff

3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6000 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 90:2b:34:9d:ed:6f brd ff:ff:ff:ff:ff:ff


03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
Subsystem: Gigabyte Technology Co., Ltd Onboard Ethernet
Flags: bus master, fast devsel, latency 0, IRQ 17, NUMA node 0
I/O ports at de00 [size=256]
Memory at fdeff000 (64-bit, prefetchable) [size=4K]
Memory at fdef8000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8169

# ethtool -i enp3s0
driver: r8169
version:
firmware-version: rtl8168e-3_0.0.4 03/27/12
expansion-rom-version:
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

# mii-tool -v enp3s0
enp3s0: negotiated 1000baseT-FD flow-control, link ok
product info: vendor 00:07:32, model 17 rev 5
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control


[ 203.908724] NETDEV WATCHDOG: enp3s0 (r8169): transmit queue 0 timed out
[ 203.908831] WARNING: CPU: 7 PID: 0 at net/sched/sch_generic.c:447 dev_watchdog+0x256/0x260
[ 203.908883] Modules linked in: cpuid i2c_dev asus_atk0110 acpi_power_meter it87 hwmon_vid af_packet bridge stp llc usbhid xhci_pci ohci_pci xhci_hcd ohci_hcd ehci_pci ehci_hcd sr_mod usbcore 8250 cdrom i2c_piix4 k10temp fam15h_power usb_common 8250_base serial_core acpi_cpufreq ghash_clmulni_intel cryptd evdev softdog
[ 203.908995] CPU: 7 PID: 0 Comm: swapper/7 Not tainted 5.4.0-rc1-00312-g4ebcb113edcc #4
[ 203.909046] Hardware name: Gigabyte Technology Co., Ltd. GA-990XA-UD3/GA-990XA-UD3, BIOS F12 05/30/2012
[ 203.909103] RIP: 0010:dev_watchdog+0x256/0x260
[ 203.909150] Code: ff 0f 1f 00 eb 85 4c 89 f7 c6 05 0a 3e b3 00 01 e8 df 40 fc ff 44 89 e9 48 89 c2 4c 89 f6 48 c7 c7 60 b3 db aa e8 ea e0 aa ff <0f> 0b e9 63 ff ff ff 0f 1f 00 0f 1f 44 00 00 48 c7 47 08 00 00 00
[ 203.909218] RSP: 0018:ffff9198801f8e70 EFLAGS: 00010282
[ 203.909266] RAX: 0000000000000000 RBX: ffff88b7b5100600 RCX: 0000000000000000
[ 203.909315] RDX: ffff88b7b6be1900 RSI: ffff88b7b6bd1aa8 RDI: 0000000000000300
[ 203.909365] RBP: ffff88b7b59a439c R08: ffff88b7b6bd1aa8 R09: 0000000000000004
[ 203.909414] R10: 0000000000000774 R11: 0000000000000000 R12: ffff88b7b59a43b8
[ 203.909463] R13: 0000000000000000 R14: ffff88b7b59a4000 R15: ffff88b7b5100680
[ 203.909513] FS: 0000000000000000(0000) GS:ffff88b7b6bc0000(0000) knlGS:0000000000000000
[ 203.909565] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 203.909612] CR2: 00007f7f2310d020 CR3: 0000000232fc4000 CR4: 00000000000406e0
[ 203.909673] Call Trace:
[ 203.909730] <IRQ>
[ 203.909789] ? qdisc_put_unlocked+0x30/0x30
[ 203.909850] ? qdisc_put_unlocked+0x30/0x30
[ 203.909910] call_timer_fn+0x32/0x170
[ 203.909969] run_timer_softirq+0x195/0x4f0
[ 203.910029] ? tick_sched_do_timer+0x60/0x60
[ 203.910088] ? tick_sched_timer+0x45/0x90
[ 203.910147] ? __hrtimer_run_queues+0x11c/0x2f0
[ 203.910209] __do_softirq+0xe4/0x319
[ 203.910269] irq_exit+0xa5/0xb0
[ 203.910327] smp_apic_timer_interrupt+0x78/0x170
[ 203.910388] apic_timer_interrupt+0xf/0x20
[ 203.911558] </IRQ>
[ 203.911616] RIP: 0010:cpuidle_enter_state+0xbf/0x480
[ 203.911676] Code: 85 c0 0f 8f fe 02 00 00 31 ff e8 0c 4c b6 ff 45 84 f6 74 12 9c 58 f6 c4 02 0f 85 95 03 00 00 31 ff e8 95 96 bb ff fb 45 85 e4 <0f> 88 82 01 00 00 49 63 cc 4d 29 fd 48 8d 04 49 48 c1 e0 05 8b 74
[ 203.911781] RSP: 0018:ffff9198800bbe70 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
[ 203.911845] RAX: ffff88b7b6be4080 RBX: ffffffffab09b460 RCX: 000000000000001f
[ 203.911907] RDX: 0000000000000000 RSI: 000000001fc92d00 RDI: 0000000000000000
[ 203.911969] RBP: ffff88b7b0103800 R08: 0000002f79e6984e R09: 00000000000f930c
[ 203.912031] R10: ffff88b7b6be31a0 R11: ffff88b7b6be3180 R12: 0000000000000002
[ 203.912093] R13: 0000002f79e6984e R14: 0000000000000000 R15: 0000002f740057dd
[ 203.912161] cpuidle_enter+0x37/0x60
[ 203.912220] do_idle+0x1ce/0x270
[ 203.912278] cpu_startup_entry+0x19/0x20
[ 203.912337] start_secondary+0x14d/0x180
[ 203.912397] secondary_startup_64+0xa4/0xb0
[ 203.912457] ---[ end trace 1c807a8b2eb1f6b6 ]---


--
Alan J. Wylie https://www.wylie.me.uk/

Dance like no-one's watching. / Encrypt like everyone is.
Security is inversely proportional to convenience

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