WiFi는 ath9k를 사용하는 Windows보다 훨씬 느립니다.

저는 Ubuntu 22.04에서 AR9485WB-EG 무선 카드를 사용하고 있는데 전송 속도는 0.3~12Mbps로, 동일한 하드웨어 및 테스트 조건에서 실행되는 Windows 7의 30~50Mbps에 비해 매우 낮습니다. Windows에서 속도가 3배에서 160배로 향상되었습니다.

한편, 내 휴대폰은 동일한 조건에서 60Mbps를 얻었습니다.

며칠에 걸쳐 여러 번 테스트한 후에도 결과는 항상 일관됩니다. 인터넷 속도 테스트 서비스를 사용하지만 동일한 WiFi 액세스 포인트를 통한 유선 측정이 항상 안정적인 95Mbps인지 확인합니다.

카드가 사용 중입니다 ath9k.

카드가 제대로 작동하도록 할 수 있나요?

sudo dmesg -t --level=alert,crit,err,warn
MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details.
 #3
pmd_set_huge: Cannot satisfy [mem 0xf8000000-0xf8200000] with a huge-page mapping due to MTRR override.
ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
ACPI Error: Needed type [Reference], found [Integer] 00000000b4ad9c1e (20210730/exresop-66)
ACPI Error: AE_AML_OPERAND_TYPE, While resolving operands for [Store] (20210730/dswexec-431)

No Local Variables are initialized for Method [_PDC]

Initialized Arguments for Method [_PDC]:  (1 arguments defined for method invocation)
  Arg0:   00000000aafce792 <Obj>           Buffer(12) 01 00 00 00 01 00 00 00

ACPI Error: Aborting method \_PR.CPU0._PDC due to previous error (AE_AML_OPERAND_TYPE) (20210730/psparse-529)
device-mapper: core: CONFIG_IMA_DISABLE_HTABLE is disabled. Duplicate IMA measurements will not be recorded in the IMA log.
platform eisa.0: EISA: Cannot allocate resource for mainboard
platform eisa.0: Cannot allocate resource for EISA slot 1
platform eisa.0: Cannot allocate resource for EISA slot 2
platform eisa.0: Cannot allocate resource for EISA slot 3
platform eisa.0: Cannot allocate resource for EISA slot 4
platform eisa.0: Cannot allocate resource for EISA slot 5
platform eisa.0: Cannot allocate resource for EISA slot 6
platform eisa.0: Cannot allocate resource for EISA slot 7
platform eisa.0: Cannot allocate resource for EISA slot 8
efifb: Ignoring BGRT: unexpected or invalid BMP data
ata2.00: failed to resume link (SControl 30)
ata2.01: failed to resume link (SControl 30)
ACPI Warning: SystemIO range 0x0000000000000428-0x000000000000042F conflicts with OpRegion 0x0000000000000400-0x000000000000044F (\GPIS) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000428-0x000000000000042F conflicts with OpRegion 0x0000000000000400-0x000000000000047F (\PMIO) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054F conflicts with OpRegion 0x0000000000000500-0x000000000000057F (\GPIO) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GP01) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053F conflicts with OpRegion 0x0000000000000500-0x000000000000057F (\GPIO) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GP01) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052F conflicts with OpRegion 0x0000000000000500-0x000000000000057F (\GPIO) (20210730/utaddress-204)
ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GP01) (20210730/utaddress-204)
lpc_ich: Resource conflict(s) found affecting gpio_ich
at24 0-0050: supply vcc not found, using dummy regulator
at24 0-0052: supply vcc not found, using dummy regulator
kauditd_printk_skb: 29 callbacks suppressed
================================================================================
UBSAN: invalid-load in /build/linux-MLl0vf/linux-5.15.0/net/mac80211/status.c:1164:21
load of value 255 is not a valid value for type '_Bool'
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.15.0-33-generic #34-Ubuntu
Hardware name: ASUSTeK COMPUTER INC. K55A/K55A, BIOS K55A.204 03/13/2012
Call Trace:
 <IRQ>
 show_stack+0x52/0x58
 dump_stack_lvl+0x4a/0x5f
 dump_stack+0x10/0x12
 ubsan_epilogue+0x9/0x45
 __ubsan_handle_load_invalid_value.cold+0x44/0x49
 ieee80211_tx_status_ext.cold+0x4e/0x5f [mac80211]
 ieee80211_tx_status+0x72/0xa0 [mac80211]
 ath_txq_unlock_complete+0x12d/0x160 [ath9k]
 ath_tx_edma_tasklet+0xef/0x4c0 [ath9k]
 ? del_timer_sync+0x6c/0xb0
 ath9k_tasklet+0x14e/0x290 [ath9k]
 tasklet_action_common.constprop.0+0xc0/0xf0
 tasklet_action+0x22/0x30
 __do_softirq+0xd9/0x2e3
 irq_exit_rcu+0x8c/0xb0
 common_interrupt+0x8a/0xa0
 </IRQ>
 <TASK>
 asm_common_interrupt+0x1e/0x40
RIP: 0010:cpuidle_enter_state+0xd9/0x620
Code: 3d f4 4b 9e 5b e8 07 ae 6c ff 49 89 c7 0f 1f 44 00 00 31 ff e8 58 ba 6c ff 80 7d d0 00 0f 85 5d 01 00 00 fb 66 0f 1f 44 00 00 <45> 85 f6 0f 88 69 01 00 00 4d 63 ee 49 83 fd 09 0f 87 e3 03 00 00
RSP: 0000:ffffaf9e800b7e28 EFLAGS: 00000246
RAX: ffff9d9a56fb0f00 RBX: ffffcf9e7fd80000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: ffffaf9e800b7e78 R08: 0000000ecbd14cf1 R09: 0000000000026160
R10: 0000000000000006 R11: 071c71c71c71c71c R12: ffffffffa5cd36c0
R13: 0000000000000002 R14: 0000000000000002 R15: 0000000ecbd14cf1
 ? cpuidle_enter_state+0xc8/0x620
 cpuidle_enter+0x2e/0x40
 cpuidle_idle_call+0x13e/0x1e0
 do_idle+0x83/0xf0
 cpu_startup_entry+0x20/0x30
 start_secondary+0x12a/0x180
 secondary_startup_64_no_verify+0xc2/0xcb
 </TASK>
================================================================================