我最近使用 设置了 NAT iptables，并且还使用 进行了一些 QoS tc。在高负载下，我的服务器的以太网设备似乎崩溃了，我/var/log/messages在崩溃时检查并看到了这一点。
Nov 9 15:14:32 home-sv-1 kernel: [154733.316993] NETDEV WATCHDOG: eth1: transmit timed out
Nov 9 15:14:32 home-sv-1 kernel: [154733.317015] ------------[ cut here ]------------
Nov 9 15:14:32 home-sv-1 kernel: [154733.317020] WARNING: at net/sched/sch_generic.c:222 dev_watchdog+0xa6/0xfb()
Nov 9 15:14:32 home-sv-1 kernel: [154733.317025] Modules linked in: cls_u32 sch_sfq sch_htb ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrac
k iptable_filter ip_tables x_tables nfsd auth_rpcgss exportfs nfs lockd nfs_acl sunrpc ipv6 8021q loop psmouse parport_pc parport serio_raw fan pegasus mii
pcspkr i2c_i801 i2c_core snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm button rng_core iTCO_wdt snd_timer snd soundcore snd_page_alloc intel_agp evdev ext
3 jbd mbcache usb_storage sd_mod ata_piix ata_generic libata scsi_mod dock ide_pci_generic ide_core ehci_hcd r8169 uhci_hcd thermal processor thermal_sys
Nov 9 15:14:32 home-sv-1 kernel: [154733.317108] Pid: 0, comm: swapper Not tainted 2.6.26-2-amd64 #1
Nov 9 15:14:32 home-sv-1 kernel: [154733.317114]
Nov 9 15:14:32 home-sv-1 kernel: [154733.317116] Call Trace:
Nov 9 15:14:32 home-sv-1 kernel: [154733.317120] <IRQ> [<ffffffff80234a20>] warn_on_slowpath+0x51/0x7a
Nov 9 15:14:32 home-sv-1 kernel: [154733.317167] [<ffffffff803cbc1e>] dev_watchdog+0x0/0xfb
Nov 9 15:14:32 home-sv-1 kernel: [154733.317181] [<ffffffff8023cf6f>] lock_timer_base+0x26/0x4b
Nov 9 15:14:32 home-sv-1 kernel: [154733.317197] [<ffffffff8023d0fe>] __mod_timer+0xbd/0xcc
Nov 9 15:14:32 home-sv-1 kernel: [154733.317224] [<ffffffffa0032380>] :ehci_hcd:ehci_urb_dequeue+0x129/0x139
Nov 9 15:14:32 home-sv-1 kernel: [154733.317237] [<ffffffff803cbc1e>] dev_watchdog+0x0/0xfb
Nov 9 15:14:32 home-sv-1 kernel: [154733.317248] [<ffffffff8038f07d>] usb_hcd_unlink_urb+0x19/0x26
Nov 9 15:14:32 home-sv-1 kernel: [154733.317258] [<ffffffff803cbc1e>] dev_watchdog+0x0/0xfb
Nov 9 15:14:32 home-sv-1 kernel: [154733.317264] [<ffffffff803cbcc4>] dev_watchdog+0xa6/0xfb
Nov 9 15:14:32 home-sv-1 kernel: [154733.317270] [<ffffffff803cbc1e>] dev_watchdog+0x0/0xfb
Nov 9 15:14:32 home-sv-1 kernel: [154733.317281] [<ffffffff8023ca35>] run_timer_softirq+0x16a/0x1e2
Nov 9 15:14:32 home-sv-1 kernel: [154733.317298] [<ffffffff802393fb>] __do_softirq+0x5c/0xd1
Nov 9 15:14:32 home-sv-1 kernel: [154733.317313] [<ffffffff8020d2cc>] call_softirq+0x1c/0x28
Nov 9 15:14:32 home-sv-1 kernel: [154733.317323] [<ffffffff8020f3d0>] do_softirq+0x3c/0x81
Nov 9 15:14:32 home-sv-1 kernel: [154733.317331] [<ffffffff8023935b>] irq_exit+0x3f/0x83
Nov 9 15:14:32 home-sv-1 kernel: [154733.317341] [<ffffffff8021aa6f>] smp_apic_timer_interrupt+0x8c/0xa4
Nov 9 15:14:32 home-sv-1 kernel: [154733.317350] [<ffffffff80212c37>] mwait_idle+0x0/0x4d
Nov 9 15:14:32 home-sv-1 kernel: [154733.317358] [<ffffffff8020ccf2>] apic_timer_interrupt+0x72/0x80
Nov 9 15:14:32 home-sv-1 kernel: [154733.317364] <EOI> [<ffffffff80212c78>] mwait_idle+0x41/0x4d
Nov 9 15:14:32 home-sv-1 kernel: [154733.317396] [<ffffffff8020ac79>] cpu_idle+0x89/0xb3
Nov 9 15:14:32 home-sv-1 kernel: [154733.317431]
Nov 9 15:14:32 home-sv-1 kernel: [154733.317435] ---[ end trace b3ff89938b0e5fc2 ]---
所以我的看法是：eth0 是一个 USB 以太网适配器... 驱动程序有问题？我怎么知道的？
答案1
事实证明，是我的廉价 USB 以太网适配器无法承受负载。