netdev - Re: Aw: Re: Re: Re: Re: [PATCH net] net: ethernet: mtk_eth_soc: fix tx throughput regression with direct 1G links

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Date:   Thu, 30 Mar 2023 19:06:13 +0200
From:   Felix Fietkau <nbd@....name>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     netdev@...r.kernel.org, Daniel Golle <daniel@...rotopia.org>
Subject: Re: Aw: Re: Re: Re: Re: [PATCH net] net: ethernet: mtk_eth_soc: fix
 tx throughput regression with direct 1G links

On 30.03.23 15:58, Frank Wunderlich wrote:
> something ist still strange...i get a rcu stall again with this patch...reverted it and my r2 boots again.
> 
> [   29.772755] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
> [   29.778689] rcu:     2-...0: (1 GPs behind) idle=547c/1/0x40000000 softirq=251/258 fqs=427
> [   29.786697] rcu:     (detected by 1, t=2104 jiffies, g=-875, q=29 ncpus=4)
> [   29.793308] Sending NMI from CPU 1 to CPUs 2:
> [   34.492968] vusb: disabling
> [   34.495828] vmc: disabling
> [   34.498587] vmch: disabling
> [   34.501433] vgp1: disabling
> [   34.504426] vcamaf: disabling
> [   39.797579] rcu: rcu_sched kthread timer wakeup didn't happen for 994 jiffies! g-875 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
> [   39.808619] rcu:     Possible timer handling issue on cpu=1 timer-softirq=493
> [   39.815487] rcu: rcu_sched kthread starved for 995 jiffies! g-875 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
> [   39.825571] rcu:     Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
> [   39.834520] rcu: RCU grace-period kthread stack dump:
> [   39.839564] task:rcu_sched       state:I stack:0     pid:14    ppid:2      flags:0x00000000
> [   39.847928]  __schedule from schedule+0x54/0xe8
> [   39.852472]  schedule from schedule_timeout+0x94/0x158
> [   39.857619]  schedule_timeout from rcu_gp_fqs_loop+0x12c/0x50c
> [   39.863467]  rcu_gp_fqs_loop from rcu_gp_kthread+0x194/0x21c
> [   39.869135]  rcu_gp_kthread from kthread+0xc8/0xcc
> [   39.873931]  kthread from ret_from_fork+0x14/0x2c
> [   39.878639] Exception stack(0xf0859fb0 to 0xf0859ff8)
> [   39.883690] 9fa0:                                     00000000 00000000 00000000 00000000
> [   39.891864] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [   39.900037] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> [   39.906645] rcu: Stack dump where RCU GP kthread last ran:
> [   39.912125] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.3.0-rc1-bpi-r2-rc-net #2
> [   39.919518] Hardware name: Mediatek Cortex-A7 (Device Tree)
> [   39.925082] PC is at default_idle_call+0x1c/0xb0
> [   39.929698] LR is at ct_kernel_enter.constprop.0+0x48/0x11c
> [   39.935267] pc : [<c0d105ec>]    lr : [<c0d0ffa4>]    psr: 600e0013
> [   39.941527] sp : f0861fb0  ip : c15721e0  fp : 00000000
> [   39.946746] r10: 00000000  r9 : 410fc073  r8 : 8000406a
> [   39.951964] r7 : c1404f74  r6 : c19e0900  r5 : c15727e0  r4 : c19e0900
> [   39.958486] r3 : 00000000  r2 : 2da0a000  r1 : 00000001  r0 : 00008cfc
> [   39.965007] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> [   39.972138] Control: 10c5387d  Table: 84f4806a  DAC: 00000051
> [   39.977878]  default_idle_call from cpuidle_idle_call+0x24/0x68
> [   39.983805]  cpuidle_idle_call from do_idle+0x9c/0xd0
> [   39.988863]  do_idle from cpu_startup_entry+0x20/0x24
> [   39.993921]  cpu_startup_entry from secondary_start_kernel+0x118/0x138
> [   40.000457]  secondary_start_kernel from 0x801017a0
> 
> maybe i need additional patch or did anything else wrong?
> 
> still working on 6.3-rc1
> https://github.com/frank-w/BPI-Router-Linux/commits/6.3-rc-net
Can you try applying this patch to a stable kernel instead? These hangs 
don't make any sense to me, especially the one triggered by an earlier 
patch that should definitely have been a no-op because of the wrong 
config symbol.
It really looks to me like you have an issue in that kernel triggered by 
spurious code changes.

- Felix