Выдает в логах следующее:

Jul 29 00:01:00 proxy eth0: setting half-duplex.
Jul 29 00:01:11 proxy ------------[ cut here ]------------
Jul 29 00:01:11 proxy WARNING: at net/sched/sch_generic.c:226 dev_watchdog+0xfe/0x180()
Jul 29 00:01:11 proxy Hardware name:
Jul 29 00:01:11 proxy NETDEV WATCHDOG: eth0 (3c59x): transmit timed out
Jul 29 00:01:11 proxy Modules linked in:
Jul 29 00:01:11 proxy Pid: 0, comm: swapper Tainted: G W 2.6.29-gentoo-r517-08-09 #1
Jul 29 00:01:11 proxy Call Trace:
Jul 29 00:01:11 proxy [<c02224cd>] warn_slowpath+0x7b/0x9f
Jul 29 00:01:11 proxy [<c02224d9>] warn_slowpath+0x87/0x9f
Jul 29 00:01:11 proxy [<c04bc832>] tcp_timewait_state_process+0x26a/0x294
Jul 29 00:01:11 proxy [<c03540d4>] cpumask_next_and+0x23/0x33
Jul 29 00:01:11 proxy [<c021b937>] find_busiest_group+0x235/0x6d2
Jul 29 00:01:11 proxy [<c0219e58>] place_entity+0x5e/0x96
Jul 29 00:01:11 proxy [<c021a5d8>] enqueue_task_fair+0x19/0x2b
Jul 29 00:01:11 proxy [<c02369c9>] getnstimeofday+0x4c/0xd2
Jul 29 00:01:11 proxy [<c04703ac>] dev_watchdog+0xfe/0x180
Jul 29 00:01:11 proxy [<c020e296>] lapic_next_event+0x10/0x13
Jul 29 00:01:11 proxy [<c0238a8f>] clockevents_program_event+0xcb/0xd9
Jul 29 00:01:11 proxy [<c02398a6>] tick_dev_program_event+0x1e/0x82
Jul 29 00:01:11 proxy [<c04702ae>] dev_watchdog+0x0/0x180
Jul 29 00:01:11 proxy [<c0229469>] run_timer_softirq+0xef/0x13f
Jul 29 00:01:11 proxy [<c02262d2>] __do_softirq+0x76/0xf8
Jul 29 00:01:11 proxy [<c0226386>] do_softirq+0x32/0x36
Jul 29 00:01:11 proxy [<c02265d9>] irq_exit+0x35/0x62
Jul 29 00:01:11 proxy [<c020e94d>] smp_apic_timer_interrupt+0x71/0x7b
Jul 29 00:01:11 proxy [<c02032c0>] apic_timer_interrupt+0x28/0x30
Jul 29 00:01:11 proxy [<c0207eaa>] mwait_idle+0x49/0x4e
Jul 29 00:01:11 proxy [<c0201943>] cpu_idle+0x57/0x70
Jul 29 00:01:11 proxy ---[ end trace 268bcf964794296b ]---
Jul 29 00:01:11 proxy eth0: transmit timed out, tx_status 00 status e002.
Jul 29 00:01:11 proxy diagnostics: net 0cd8 media 8080 dma 800000a0 fifo 0000
Jul 29 00:01:11 proxy Flags; bus-master 1, dirty 0(0) current 16(0)
Jul 29 00:01:11 proxy Transmit list 36a1f200 vs. f6a1f200.
Jul 29 00:01:11 proxy 0: @f6a1f200 length 00000042 status 0c000053
Jul 29 00:01:11 proxy 1: @f6a1f2a0 length 00000042 status 0c0005c2
Jul 29 00:01:11 proxy 2: @f6a1f340 length 00000042 status 0c0005c2
Jul 29 00:01:11 proxy 3: @f6a1f3e0 length 00000042 status 0c000053
Jul 29 00:01:11 proxy 4: @f6a1f480 length 00000042 status 0c0005e2
Jul 29 00:01:11 proxy 5: @f6a1f520 length 00000042 status 0c000586
Jul 29 00:01:11 proxy 6: @f6a1f5c0 length 8000005a status 0000005a
Jul 29 00:01:11 proxy 7: @f6a1f660 length 00000042 status 0c000053
Jul 29 00:01:11 proxy 8: @f6a1f700 length 00000042 status 0c000468
Jul 29 00:01:11 proxy 9: @f6a1f7a0 length 00000042 status 0c0005c2
Jul 29 00:01:11 proxy 10: @f6a1f840 length 00000036 status 0c0005e2
Jul 29 00:01:11 proxy 11: @f6a1f8e0 length 00000042 status 0c0002d9
Jul 29 00:01:11 proxy 12: @f6a1f980 length 00000042 status 0c0005d6
Jul 29 00:01:11 proxy 13: @f6a1fa20 length 80000044 status 00000044
Jul 29 00:01:11 proxy 14: @f6a1fac0 length 80000102 status 80000102
Jul 29 00:01:11 proxy 15: @f6a1fb60 length 00000042 status 8c0005c2
Jul 29 00:01:11 proxy eth0: Resetting the Tx ring pointer.

Это 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 30). down/up интерфейса иногда помогает. Чаще приводит к зависанию. Ядро 2.6.29.
Причем торрент пахать может хоть целые сутки, а как только включаешь WoW - беда.

У кого есть идеи куда копать? Вообще то карточка старая, но у них вроде пожизненная гарантия...
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