Hi @nbd,
Thanks for working on this.
Setup:
Openwrt:
- Openwrt 22.03
- IPQ8064
- 256MB RAM
- ath10k-ct 5.15
Test setup:
- I changed my setup to only include 20 linux clients (no mac or ios clients).
Patches
I applied your new patches on top of latest (as of 3 days ago) openwrt 22.03.
Results
They are the same 
- high memory usage and then crash (Unable to handle kernel NULL pointer dereference) - report below
- more than 3 or 4 clients, download: tcp throughput drops to around 100Mbps and udp throughput halves
- more than 3 or 4 clients, upload: udp throughput drops to around 50Mpbs
- same results when adding (throughput drops) or removing (throughput increases) clients while running the tests
I checked the build_dir to see if patches were applied correctly for mac80211 files and looks like they were applied. But I am going to do a "super clean" build just in case something didn't compile correct.
[ 143.584926] 8<--- cut here ---
[ 143.587923] Unable to handle kernel NULL pointer dereference at virtual address 00000004
[ 143.591004] pgd = 99bcb531
[ 143.599347] [00000004] *pgd=00000000
[ 143.599679] netifd invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=0
[ 143.601764] Internal error: Oops: 5 [#1] SMP ARM
[ 143.605501] CPU: 0 PID: 678 Comm: netifd Not tainted 5.10.120 #0
[ 143.613566] Modules linked in:
[ 143.618428] Hardware name: Generic DT based system
[ 143.618433] nft_fib_inet
[ 143.624429] [<c030e54c>] (unwind_backtrace) from [<c030a2d0>] (show_stack+0x14/0x20)
[ 143.627280] nf_flow_table_ipv6
[ 143.632062] [<c030a2d0>] (show_stack) from [<c061d10c>] (dump_stack+0x94/0xa8)
[ 143.634750] nf_flow_table_ipv4
[ 143.642569] [<c061d10c>] (dump_stack) from [<c041606c>] (dump_header+0x58/0x1a8)
[ 143.645427] nf_flow_table_inet
[ 143.652719] [<c041606c>] (dump_header) from [<c041687c>] (oom_kill_process+0x1ec/0x1f0)
[ 143.655757] ath10k_pci
[ 143.663396] [<c041687c>] (oom_kill_process) from [<c0417264>] (out_of_memory+0x194/0x358)
[ 143.666260] ath10k_core
[ 143.674246] [<c0417264>] (out_of_memory) from [<c045aa9c>] (__alloc_pages_nodemask+0x9ac/0xed4)
[ 143.676677] ath
[ 143.685007] [<c045aa9c>] (__alloc_pages_nodemask) from [<c045afdc>] (__get_free_pages+0x18/0x3c)
[ 143.687615] wireguard
[ 143.696034] [<c045afdc>] (__get_free_pages) from [<c04f2c38>] (proc_pid_readlink+0xa0/0x1e8)
[ 143.698119] nft_reject_ipv6
[ 143.706886] [<c04f2c38>] (proc_pid_readlink) from [<c0489544>] (vfs_readlink+0x100/0x110)
[ 143.709057] nft_reject_ipv4
[ 143.717651] [<c0489544>] (vfs_readlink) from [<c047c440>] (do_readlinkat+0xb0/0x10c)
[ 143.720515] nft_reject_inet
[ 143.728586] [<c047c440>] (do_readlinkat) from [<c0300060>] (ret_fast_syscall+0x0/0x54)
[ 143.731538] nft_reject
[ 143.739258] Exception stack(0xc2a6dfa8 to 0xc2a6dff0)
[ 143.742128] nft_redir
[ 143.749857] dfa0: 00000011 b6f0f984 beacbd34 beacbd10 00000011 beacbd04
[ 143.752195] nft_quota
[ 143.757410] dfc0: 00000011 b6f0f984 beacbd10 00000055 b6f11010 00046784 00045b90 beacbd6c
[ 143.759664] nft_objref
[ 143.767908] dfe0: 00045e68 beacbd00 00017724 b6eedcec
[ 143.770167] nft_numgen
[ 143.778493] Mem-Info:
[ 143.780667] nft_nat
[ 143.785880] active_anon:35 inactive_anon:1244 isolated_anon:0
[ 143.785880] active_file:115 inactive_file:115 isolated_file:0
[ 143.785880] unevictable:0 dirty:0 writeback:0
[ 143.785880] slab_reclaimable:878 slab_unreclaimable:3507
[ 143.785880] mapped:188 shmem:15 pagetables:95 bounce:0
[ 143.785880] free:2777 free_pcp:92 free_cma:0
[ 143.788128] nft_masq nft_log nft_limit nft_hash nft_flow_offload nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_ct nft_counter nft_chain_nat nf_tables nf_nat nf_flow_table nf_conntrack mac80211 libchacha20poly1305 curve25519_neon cfg80211 poly1305_arm nfnetlink nf_reject_ipv6
[ 143.790567] Node 0 active_anon:140kB inactive_anon:4976kB active_file:460kB inactive_file:460kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:752kB dirty:0kB writeback:0kB shmem:60kB writeback_tmp:0kB kernel_stack:752kB all_unreclaimable? no
[ 143.801229] nf_reject_ipv4 nf_log_ipv6 nf_log_ipv4 nf_log_common nf_defrag_ipv6 nf_defrag_ipv4 libcurve25519_generic libcrc32c crc_ccitt compat chacha_neon ledtrig_usbport ledtrig_oneshot ip6_udp_tunnel udp_tunnel seqiv cmac leds_gpio
[ 143.825258] Normal free:11108kB min:16384kB low:20480kB high:24576kB reserved_highatomic:0KB active_anon:140kB inactive_anon:4976kB active_file:588kB inactive_file:612kB unevictable:0kB writepending:0kB present:229376kB managed:216724kB mlocked:0kB pagetables:380kB bounce:0kB free_pcp:368kB local_pcp:328kB free_cma:0kB
[ 143.847844] xhci_plat_hcd xhci_pci xhci_hcd dwc3 dwc3_qcom ohci_platform ohci_hcd ledtrig_transient phy_qcom_ipq806x_usb ahci fsl_mph_dr_of ehci_platform ehci_fsl sd_mod ahci_platform libahci_platform libahci
[ 143.870139] lowmem_reserve[]:
[ 143.896889] libata scsi_mod ehci_hcd gpio_button_hotplug crc32c_generic
[ 143.896912] CPU: 1 PID: 77 Comm: kworker/1:4 Not tainted 5.10.120 #0
[ 143.896915] Hardware name: Generic DT based system
[ 143.896928] Workqueue: ubiblock0_1 ubiblock_do_work
[ 143.896940] PC is at submit_descs+0x64/0x1a4
[ 143.896951] LR is at vchan_tx_submit+0x74/0x88
[ 143.919187] 0
[ 143.937607] pc : [<c070775c>] lr : [<c0687fb4>] psr: 20000113
[ 143.937611] sp : c1313c98 ip : c103231c fp : 000001f4
[ 143.937615] r10: ffffffff r9 : c2afe000 r8 : c12c0f40
[ 143.937620] r7 : 00000000 r6 : c12c0f40 r5 : c12c0f84 r4 : c1c87640
[ 143.937624] r3 : 000079c5 r2 : c2f92f38 r1 : 20000113 r0 : fffffff4
[ 143.937628] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 143.937632] Control: 10c5787d Table: 44a6806a DAC: 00000051
[ 143.937638] Process kworker/1:4 (pid: 77, stack limit = 0x3e2370e7)
[ 143.937642] Stack: (0xc1313c98 to 0xc1314000)
[ 143.937649] 3c80: c1369040 00000000
[ 143.937666] 3ca0: 0000001b 00000004 c12c0f40 c0708f28 00000000 c11e1cc0 00000001 c11e1cc0
[ 143.937683] 3cc0: c1369040 c2afd800 00000000 0000be1b 0000be1b c2afd800 c12c0f40 00000000
[ 143.940565] 0
[ 143.947344] 3ce0: c1313dc8 c1369040 c07093f8 00000800 00000000 00000000 00000000 c1313dc8
[ 143.947360] 3d00: c136911c c06f8c44 c190f200 0011edd8 00000040 00000000 c2afd800 00000800
[ 143.947376] 3d20: 0000be1b 00000000 00000000 c2afd800 c2afd800 00000800 00000000 0000be1b
[ 143.947391] 3d40: 00000000 00000000 00000000 00000040 00000000 c0dda304 00000000 00000000
[ 143.947406] 3d60: 00000000 00000000 00000001 c1369040 c1800c00 c1313dc8 00000000 01f0d000
[ 143.953672] 0
[ 143.958282] 3d80: 00000000 00000000 00000000 c06e1648 c1313dc8 cdde0d40 0000b6ab 00000000
[ 143.958298] 3da0: 00000000 0000d000 000000f8 00001000 00000000 c0ac128c 01f0d000 c06e175c
[ 143.958314] 3dc0: c1313dc8 00000c40 00000000 00001000 00000000 00000000 00000000 00000000
[ 143.958332] 3de0: c2afd000 00000000 00000030 00000004 c1920000 c07199e0 00001000 c1313e1c
[ 143.963045]
[ 143.967570] 3e00: c2afd000 c1920000 c1300800 c2afd000 c0a4af74 c0ac1258 00000001 c0716d50
[ 143.967585] 3e20: 00000030 00000000 c1920000 c1300800 00000030 c2afd000 000000f8 00000001
[ 143.967602] 3e40: 00000030 c0717710 00001000 01e3372f c0a3fef4 9ef5325f 00000000 c1b405b8
[ 143.967617] 3e60: c1b40578 00001000 00013000 00000005 c1920000 c1300800 00000030 c0717acc
[ 143.971809] Normal:
[ 143.973475] 3e80: 0000c000 00001000 00000000 00000000 00001c00 c1312000 00000000 00000000
[ 143.979671] 175*4kB
[ 143.984844] 3ea0: 00008400 c1300800 c1b40578 00016c00 c1b404c0 c1920000 00000001 c0716124
[ 143.990102] (ME)
[ 143.996651] 3ec0: 0000d000 00016c00 00000000 00000000 ff7f8e00 0001f000 00008400 00018800
[ 144.003224] 147*8kB
[ 144.010366] 3ee0: 00000031 c1b40578 c1b404c0 c12fee00 00000000 c0721ce0 00016c00 00000000
[ 144.010381] 3f00: c2eeaa00 c1b406d0 c1313f44 c1b40568 c1075c00 cdde0900 ff7f8e00 00000000
[ 144.010397] 3f20: 00000040 00000000 c1312000 c0338c00 00000008 cdde0918 c1075c00 c1075c14
[ 144.010413] 3f40: cdde0900 00000008 cdde0918 c0d03d00 cdde0ac0 c0338eec c0daeb48 c0d0c02c
[ 144.016085] (ME)
[ 144.022169] 3f60: c1075c00 c107a940 c107a6c0 00000000 c1312000 c0338e78 c1075c00 c1311ec4
[ 144.022184] 3f80: c107a964 c033edd4 00000000 c107a6c0 c033ec78 00000000 00000000 00000000
[ 144.022200] 3fa0: 00000000 00000000 00000000 c0300148 00000000 00000000 00000000 00000000
[ 144.022218] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 144.026679] 71*16kB
[ 144.034847] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[ 144.034859] [<c070775c>] (submit_descs) from [<c0708f28>] (read_page_ecc+0x170/0x580)
[ 144.034874] [<c0708f28>] (read_page_ecc) from [<c06f8c44>] (nand_read_oob+0x1d4/0x790)
[ 144.034887] [<c06f8c44>] (nand_read_oob) from [<c06e1648>] (mtd_read_oob+0x94/0x168)
[ 144.034897] [<c06e1648>] (mtd_read_oob) from [<c06e175c>] (mtd_read+0x40/0x5c)
[ 144.034907] [<c06e175c>] (mtd_read) from [<c07199e0>] (ubi_io_read+0xd4/0x368)
[ 144.043053] (UME)
[ 144.051159] [<c07199e0>] (ubi_io_read) from [<c0717710>] (ubi_eba_read_leb+0xa8/0x3e0)
[ 144.051170] [<c0717710>] (ubi_eba_read_leb) from [<c0717acc>] (ubi_eba_read_leb_sg+0x84/0x194)
[ 144.051179] [<c0717acc>] (ubi_eba_read_leb_sg) from [<c0716124>] (ubi_leb_read_sg+0x94/0xd4)
[ 144.051188] [<c0716124>] (ubi_leb_read_sg) from [<c0721ce0>] (ubiblock_do_work+0x94/0x134)
[ 144.051204] [<c0721ce0>] (ubiblock_do_work) from [<c0338c00>] (process_one_work+0x1fc/0x474)
[ 144.051214] [<c0338c00>] (process_one_work) from [<c0338eec>] (worker_thread+0x74/0x5d4)
[ 144.052722] 33*32kB
[ 144.060974] [<c0338eec>] (worker_thread) from [<c033edd4>] (kthread+0x15c/0x160)
[ 144.060984] [<c033edd4>] (kthread) from [<c0300148>] (ret_from_fork+0x14/0x2c)
[ 144.060988] Exception stack(0xc1313fb0 to 0xc1313ff8)
[ 144.060998] 3fa0: 00000000 00000000 00000000 00000000
[ 144.061012] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 144.061025] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 144.069170] (UME)
[ 144.077295] Code: e1550004 03a00000 0a000005 e594001c (e5903010)
[ 144.077409] ---[ end trace 0f6ecaa7d5167b70 ]---