Hi all.

I have two servers 2.6.18-308.4.1.el5PAE CentOS release 5.7 (Final) Both have two external gigabit network cards (installed Planet with Realtek r8169 chipset).

lspci

04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet (rev 10) 04:01.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet (rev 10)

/var/log/messages

May 3 15:00:22 ms7a kernel: r8169: eth1: link up May 3 16:05:27 ms7a kernel: irq 177: nobody cared (try booting with the "irqpoll" option) May 3 16:05:27 ms7a kernel: [<c044ea52>] __report_bad_irq+0x2b/0x69 May 3 16:05:27 ms7a kernel: [<c044ec49>] note_interrupt+0x1b9/0x1f0 May 3 16:05:27 ms7a kernel: [<c044e339>] __do_IRQ+0xdd/0x118 May 3 16:05:27 ms7a kernel: [<c044e25c>] __do_IRQ+0x0/0x118 May 3 16:05:27 ms7a kernel: [<c04074c4>] do_IRQ+0x9b/0xc3 May 3 16:05:27 ms7a kernel: [<c040597a>] common_interrupt+0x1a/0x20 May 3 16:05:27 ms7a kernel: [<c05339f3>] acpi_processor_idle_simple+0x174/0x297 May 3 16:05:27 ms7a kernel: [<c0522a21>] acpi_set_register+0x14c/0x155 May 3 16:05:27 ms7a kernel: [<c0403d14>] cpu_idle+0x9f/0xb9 May 3 16:05:27 ms7a kernel: ======================= May 3 16:05:27 ms7a kernel: handlers: May 3 16:05:27 ms7a kernel: [<f89710d9>] (rtl8169_interrupt+0x0/0x232 [r8169]) May 3 16:05:27 ms7a kernel: Disabling IRQ #177

May 4 12:46:03 ms7b kernel: irq 177: nobody cared (try booting with the "irqpoll" option) May 4 12:46:03 ms7b kernel: [<c044ee5a>] __report_bad_irq+0x2b/0x69 May 4 12:46:03 ms7b kernel: [<c044f051>] note_interrupt+0x1b9/0x1f0 May 4 12:46:03 ms7b kernel: [<c044e741>] __do_IRQ+0xdd/0x118 May 4 12:46:03 ms7b kernel: [<c044e664>] __do_IRQ+0x0/0x118 May 4 12:46:03 ms7b kernel: [<c04074c4>] do_IRQ+0x9b/0xc3 May 4 12:46:03 ms7b kernel: [<c040597a>] common_interrupt+0x1a/0x20 May 4 12:46:03 ms7b kernel: [<c05f3518>] tcp_rcv_established+0x77c/0x784 May 4 12:46:03 ms7b kernel: [<c05c117e>] skb_checksum+0x52/0x282 May 4 12:46:03 ms7b kernel: [<c05f8522>] tcp_v4_do_rcv+0x25/0x2b6 May 4 12:46:03 ms7b kernel: [<c05faa9a>] tcp_v4_rcv+0x8e9/0x93b May 4 12:46:03 ms7b kernel: [<c05e21e1>] ip_local_deliver+0x15b/0x206 May 4 12:46:03 ms7b kernel: [<c05e204c>] ip_rcv+0x47f/0x4b9 May 4 12:46:03 ms7b kernel: [<c05c6aea>] netif_receive_skb+0x3dd/0x401 May 4 12:46:03 ms7b kernel: [<f89828c2>] rtl8169_rx_interrupt+0x4be/0x4cd [r8169] May 4 12:46:03 ms7b kernel: [<f898516d>] rtl8169_poll_compat+0x48/0x19f [r8169] May 4 12:46:03 ms7b kernel: [<c05c8923>] net_rx_action+0x9c/0x19c May 4 12:46:03 ms7b kernel: [<c042ad55>] __do_softirq+0x87/0x114 May 4 12:46:03 ms7b kernel: [<c04073e5>] do_softirq+0x4e/0x92 May 4 12:46:03 ms7b kernel: [<c044e664>] __do_IRQ+0x0/0x118 May 4 12:46:03 ms7b kernel: [<c04074e0>] do_IRQ+0xb7/0xc3 May 4 12:46:03 ms7b kernel: [<c040597a>] common_interrupt+0x1a/0x20 May 4 12:46:03 ms7b kernel: [<c0534c17>] acpi_processor_idle_simple+0x0/0x2e5 May 4 12:46:03 ms7b kernel: [<c053452b>] acpi_safe_halt+0x14/0x20 May 4 12:46:03 ms7b kernel: [<c0534ced>] acpi_processor_idle_simple+0xd6/0x2e5 May 4 12:46:03 ms7b kernel: [<c0523db9>] <6>NETDEV WATCHDOG: eth1: transmit timed out May 4 12:46:03 ms7b kernel: acpi_set_register+0x14c/0x155 May 4 12:46:03 ms7b kernel: [<c0403d14>] cpu_idle+0x9f/0xb9 May 4 12:46:03 ms7b kernel: ======================= May 4 12:46:03 ms7b kernel: handlers: May 4 12:46:03 ms7b kernel: [<f89830d9>] (rtl8169_interrupt+0x0/0x232 [r8169]) May 4 12:46:03 ms7b kernel: Disabling IRQ #177 May 4 12:46:03 ms7b kernel: r8169: eth1: link up

I have random network connectivity problems only reboot helps for some time, then the problem returns.

I've added irqpoll option to kernel line in grub.conf but it hasn't helped. I've checked options in bios but haven't found anything interesting.

Any clues what to do next?

Best regards, Rafal Radecki.