This bug affects me also. This used to take effect, when I have huge traffic.

The log:
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040063] WARNING: at /build/buildd/linux-2.6.32/net/sched/sch_generic.c:261 dev_watchdog+0x262/0x270()
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040068] Hardware name: F5SL              
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040073] NETDEV WATCHDOG: eth0 (sis190): transmit queue 0 timed out
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040077] Modules linked in: binfmt_misc ppdev vboxnetadp vboxnetflt vboxdrv snd_hda_codec_si3054 snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm arc4 snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer fbcon ath5k snd_seq_device tileblit mac80211 font joydev sis190 snd bitblit ath fglrx(P) soundcore softcursor mii sis_agp snd_page_alloc cfg80211 vga16fb uvcvideo vgastate videodev psmouse usbhid vhba v4l1_compat serio_raw hid v4l2_compat_ioctl32 video output asus_laptop led_class lp parport tcp_illinois jfs usb_storage sata_sis
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040176] Pid: 0, comm: swapper Tainted: P           2.6.32-22-generic #36-Ubuntu
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040181] Call Trace:
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040185]  <IRQ>  [<ffffffff81066d0b>] warn_slowpath_common+0x7b/0xc0
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040203]  [<ffffffff81066db1>] warn_slowpath_fmt+0x41/0x50
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040210]  [<ffffffff81476612>] dev_watchdog+0x262/0x270
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040220]  [<ffffffff81094378>] ? tick_dev_program_event+0x68/0xd0
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040229]  [<ffffffff810397a9>] ? default_spin_lock_flags+0x9/0x10
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040238]  [<ffffffff81540cfe>] ? _spin_lock+0xe/0x20
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040244]  [<ffffffff814763b0>] ? dev_watchdog+0x0/0x270
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040252]  [<ffffffff81077697>] run_timer_softirq+0x197/0x340
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040259]  [<ffffffff81094378>] ? tick_dev_program_event+0x68/0xd0
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040267]  [<ffffffff8106e3a7>] __do_softirq+0xb7/0x1e0
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040274]  [<ffffffff810c4de0>] ? handle_IRQ_event+0x60/0x170
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040282]  [<ffffffff810142ec>] call_softirq+0x1c/0x30
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040288]  [<ffffffff81015cb5>] do_softirq+0x65/0xa0
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040293]  [<ffffffff8106e245>] irq_exit+0x85/0x90
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040300]  [<ffffffff81545ed5>] do_IRQ+0x75/0xf0
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040306]  [<ffffffff81013b13>] ret_from_intr+0x0/0x11
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040309]  <EOI>  [<ffffffff8130d492>] ? acpi_idle_enter_simple+0x117/0x14b
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040324]  [<ffffffff8130d48b>] ? acpi_idle_enter_simple+0x110/0x14b
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040333]  [<ffffffff81437537>] ? cpuidle_idle_call+0xa7/0x140
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040341]  [<ffffffff81011e73>] ? cpu_idle+0xb3/0x110
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040348]  [<ffffffff8152bfdb>] ? rest_init+0x6b/0x80
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040356]  [<ffffffff81849dcc>] ? start_kernel+0x368/0x371
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040363]  [<ffffffff8184933a>] ? x86_64_start_reservations+0x125/0x129
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040369]  [<ffffffff81849438>] ? x86_64_start_kernel+0xfa/0x109
Jun 21 13:02:05 picimaci-laptop kernel: [21553.040374] ---[ end trace d57e1f7d95a1560b ]---