我在一台舊桌上型電腦上運行 Xubuntu 16.04，具有以下核心：
$ uname -a
Linux casa-desktop 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
即使在升級之前，它的運行速度就開始變慢，我認為這是因為舊硬體的原因。然後我注意到該systemd-journald服務持續以 10% 左右的速度使用 CPU。啟動分區很快就會被填滿，因為/var/log/.
運行sudo journalctl顯示了這樣的無限重複：
mag 23 21:04:39 casa-desktop kernel: ------------[ cut here ]------------
mag 23 21:04:39 casa-desktop kernel: WARNING: CPU: 0 PID: 71 at /build/linux-As38az/linux-4.4.0/drivers/usb/core/urb.c:449 usb_submit_urb.part.6+0x142/0x560()
mag 23 21:04:39 casa-desktop kernel: usb 2-1: BOGUS urb xfer, pipe 1 != type 3
mag 23 21:04:39 casa-desktop kernel: Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c ath9k_htc drbg ansi_cprng ctr ccm binfmt_misc arc4 ath9k_common ath9k_hw ath mac80211 cfg80211 nvidia(POE) coretemp kvm_intel kvm irqbypass snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_mpu401_uart drm input_leds serio_raw snd_pcm ns558 shpchp lpc_ich asus_atk0110 snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd 8250_fintek soundcore gameport mac_hid parport_pc ppdev lp parport autofs4 hid_generic usbhid hid pata_it821x skge pata_acpi sky2 floppy fjes [last unloaded: ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: CPU: 0 PID: 71 Comm: kworker/u4:3 Tainted: P W OE 4.4.0-79-generic #100-Ubuntu
mag 23 21:04:39 casa-desktop kernel: Hardware name: System manufacturer System Product Name/P5LD2, BIOS 1401 08/24/2006
mag 23 21:04:39 casa-desktop kernel: Workqueue: phy1 ath9k_htc_ani_work [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: 0000000000000286 00000000924d4ef3 ffff8800b538fb50 ffffffff813f94d3
mag 23 21:04:39 casa-desktop kernel: ffff8800b538fb98 ffffffff81d51bc0 ffff8800b538fb88 ffffffff81081322
mag 23 21:04:39 casa-desktop kernel: ffff8800ba607e40 0000000000000002 ffff8800b53a7000 0000000000000001
mag 23 21:04:39 casa-desktop kernel: Call Trace:
mag 23 21:04:39 casa-desktop kernel: [<ffffffff813f94d3>] dump_stack+0x63/0x90
mag 23 21:04:39 casa-desktop kernel: [<ffffffff81081322>] warn_slowpath_common+0x82/0xc0
mag 23 21:04:39 casa-desktop kernel: [<ffffffff810813bc>] warn_slowpath_fmt+0x5c/0x80
mag 23 21:04:39 casa-desktop kernel: [<ffffffff81626872>] usb_submit_urb.part.6+0x142/0x560
mag 23 21:04:39 casa-desktop kernel: [<ffffffff81626cf2>] usb_submit_urb+0x62/0x70
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc037cd8b>] hif_usb_send+0xeb/0x340 [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc037b058>] htc_issue_send.constprop.2+0x58/0x70 [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc037b428>] htc_send_epid+0x18/0x20 [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc037e1f1>] ath9k_wmi_cmd+0x111/0x1a0 [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc0383cd0>] ath9k_regwrite+0x70/0x100 [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc022bbeb>] ath_hw_cycle_counters_update+0xab/0x130 [ath]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc02de9d9>] ath9k_hw_ani_monitor+0x29/0x1c0 [ath9k_hw]
mag 23 21:04:39 casa-desktop kernel: [<ffffffffc0382b6d>] ath9k_htc_ani_work+0xcd/0x1a0 [ath9k_htc]
mag 23 21:04:39 casa-desktop kernel: [<ffffffff8109a585>] process_one_work+0x165/0x480
mag 23 21:04:39 casa-desktop kernel: [<ffffffff8109a8eb>] worker_thread+0x4b/0x4c0
mag 23 21:04:39 casa-desktop kernel: [<ffffffff8109a8a0>] ? process_one_work+0x480/0x480
mag 23 21:04:39 casa-desktop kernel: [<ffffffff810a0c25>] kthread+0xe5/0x100
mag 23 21:04:39 casa-desktop kernel: [<ffffffff810a0b40>] ? kthread_create_on_node+0x1e0/0x1e0
mag 23 21:04:39 casa-desktop kernel: [<ffffffff81840e0f>] ret_from_fork+0x3f/0x70
mag 23 21:04:39 casa-desktop kernel: [<ffffffff810a0b40>] ? kthread_create_on_node+0x1e0/0x1e0
mag 23 21:04:39 casa-desktop kernel: ---[ end trace 67672e07ef748fe4 ]---
mag 23 21:04:39 casa-desktop kernel: ------------[ cut here ]------------
這是由 TP-Link TL-WN722N USB 無線適配器引起的：
Bus 002 Device 002: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n
這是linux-firmware我的版本：
$ sudo dpkg -s linux-firmware | grep -i version
Version: 1.157.10
這是輸出lsusb -vv：https://paste.ubuntu.com/24679177/
奇怪的是...無線連線正常我可以順利地上網。然而，這種行為會降低機器的速度，並不斷地用日誌填滿分割區。
我該如何解決這個問題？作為臨時解決方法，我使用具有不同晶片組的備用無線適配器，但我希望將來保留它以供其他用途。
答案1
請注意，您的韌體版本是 1.157。我建議您將韌體更新到最新的1.164。從航廈：
wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.164_all.deb
sudo dpkg -i linux-firmware*.deb
正如所建議的，我還建議您安裝最新的核心版本，而不是來自建議的。
重新啟動並再次檢查日誌。
透過我們的聊天室討論，我認為這可能是電腦 BIOS 設定中的問題。我建議您嘗試將 BIOS 重設為預設值，並且您報告問題已修正。感謝您的報告，因為我確信相當多的搜尋者會找到解決方案並從您的報告中受益。