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Date: Mon, 30 Nov 2009 10:23:00 +0500
From: Rinat Shigapov <srk@nevod.ru>
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Добрый день!

Примерно раз в 2 месяца подвисает один из интерфейсов. Спасает ребут. 
Судя по логам, проблемы с прерываниями:

Nov 29 04:03:35 router kernel: NETDEV WATCHDOG: eth2: transmit timed out
Nov 29 04:03:35 router kernel: eth2: transmit timed out, tx_status 00 
status e601.
Nov 29 04:03:35 router kernel:   diagnostics: net 0cfa media 8880 dma 
0000003a fifo 0000
Nov 29 04:03:35 router kernel: eth2: Interrupt posted but not delivered 
-- IRQ blocked by another device?
Nov 29 04:03:35 router kernel:   Flags; bus-master 1, dirty 20330650(10) 
current 20330650(10)
Nov 29 04:03:35 router kernel:   Transmit list 00000000 vs. 
ffff8100365a4840.
Nov 29 04:03:35 router kernel:   0: @ffff8100365a4200  length 80000107 
status 00010107
Nov 29 04:03:35 router kernel:   1: @ffff8100365a42a0  length 80000107 
status 00010107
Nov 29 04:03:35 router kernel:   2: @ffff8100365a4340  length 80000107 
status 00010107
Nov 29 04:03:35 router kernel:   3: @ffff8100365a43e0  length 80000106 
status 00010106
Nov 29 04:03:35 router kernel:   4: @ffff8100365a4480  length 80000218 
status 00010218
Nov 29 04:03:35 router kernel:   5: @ffff8100365a4520  length 80000107 
status 00010107
Nov 29 04:03:35 router kernel:   6: @ffff8100365a45c0  length 80000107 
status 00010107
Nov 29 04:03:35 router kernel:   7: @ffff8100365a4660  length 80000107 
status 00010107
Nov 29 04:03:35 router kernel:   8: @ffff8100365a4700  length 80000107 
status 80010107
Nov 29 04:03:35 router kernel:   9: @ffff8100365a47a0  length 80000221 
status 80010221
Nov 29 04:03:35 router kernel:   10: @ffff8100365a4840  length 80000094 
status 00010094
Nov 29 04:03:35 router kernel:   11: @ffff8100365a48e0  length 80000124 
status 00010124
Nov 29 04:03:35 router kernel:   12: @ffff8100365a4980  length 80000124 
status 00010124
Nov 29 04:03:35 router kernel:   13: @ffff8100365a4a20  length 80000124 
status 00010124
Nov 29 04:03:35 router kernel:   14: @ffff8100365a4ac0  length 8000003e 
status 0001003e
Nov 29 04:03:35 router kernel:   15: @ffff8100365a4b60  length 80000107 
status 00010107

Есть ли меры профилактики против этого?

Речь идёт о карте  3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 74), 
ядро 2.6.18-ovz-smp-alt23.M40.3

-- 
С уважением, Шигапов Ринат
     инженер-программист ООО "Невод"
     тел. (342) 2 196 960
     JID: dxist эт ya.ru