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Date: Mon, 16 Jun 2008 13:37:43 +0300 From: "Denys Fedoryshchenko" <denys@...p.net.lb> To: Francois Romieu <romieu@...zoreil.com> Cc: netdev@...r.kernel.org Subject: Re: r8169 rx descriptors On Mon, 16 Jun 2008 00:04:10 +0200, Francois Romieu wrote > Denys Fedoryshchenko <denys@...p.net.lb> : > [...] > > Why in Linux source: > > > > #define NUM_TX_DESC 64 /* Number of Tx descriptor registers */ > > #define NUM_RX_DESC 256 /* Number of Rx descriptor registers */ > > One do not necessarily gain much from a huge Rx / Tx ring. You can > increase NUM_RX_DESC though. > > > Is it possible to do them changeable over ethtool -g ? > > Yes. > > > Maybe NetBSD developers signed NDA and have access to datasheets? > > A NDA is not needed. You can get in touch with Edward Hsu > <edward_hsu@...ltek.com.tw> if you have some questions. > > It can help for the moderately documented irq mitigation register. > > > Also i seen in one patch from Realtek , something similar to > > -#define RX_DMA_BURST 6 /* Maximum PCI burst, '6' is 1024 */ > > +#define RX_DMA_BURST 7 /* Maximum PCI burst, '6' is 1024 */ > > > > Why it is reverted or not applied? > > I do not always apply Realtek's changes blindly. This one could make > a difference though. > > > In sources from Realtek website it is > > #define RX_DMA_BURST 7 /* Maximum PCI burst, '7' is unlimited */ > > #define TX_DMA_BURST 7 /* Maximum PCI burst, '7' is unlimited */ > > > > I will try to change burst settings on my router, and waiting comments about > > Apparently 1) you are experiencing Rx fifo overflows 2) your mean packet > stands at 300 bytees. I'd try to lower RX_FIFO_THRESH first then > lower TX_DMA_BURST. After lowering RX_FIFO_THRESH to 5 (i tried 6, also crashed), it crashes after few seconds. Maybe it is not real bug, just driver not supposed to handle lower values. But maybe it's triggering some bug? If it is interesting here is panic message from RX_FIFO_THRESH set to 5: Jun 16 13:32:20 10.22.22.3 [ 18.025132] BUG: unable to handle kernel Jun 16 13:32:20 10.22.22.3 NULL pointer dereference Jun 16 13:32:20 10.22.22.3 at 000000ac Jun 16 13:32:20 10.22.22.3 [ 18.025254] IP: Jun 16 13:32:20 10.22.22.3 [<c02469ba>] dev_kfree_skb_irq+0x6/0x3c Jun 16 13:32:20 10.22.22.3 [ 18.025351] Oops: 0002 [#1] Jun 16 13:32:20 10.22.22.3 SMP Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 [ 18.025455] Modules linked in: Jun 16 13:32:20 10.22.22.3 netconsole Jun 16 13:32:20 10.22.22.3 configfs Jun 16 13:32:20 10.22.22.3 iTCO_wdt Jun 16 13:32:20 10.22.22.3 coretemp Jun 16 13:32:20 10.22.22.3 hwmon Jun 16 13:32:20 10.22.22.3 i2c_i801 Jun 16 13:32:20 10.22.22.3 i2c_core Jun 16 13:32:20 10.22.22.3 e1000e Jun 16 13:32:20 10.22.22.3 iptable_filter Jun 16 13:32:20 10.22.22.3 ip_tables Jun 16 13:32:20 10.22.22.3 x_tables Jun 16 13:32:20 10.22.22.3 8021q Jun 16 13:32:20 10.22.22.3 tun Jun 16 13:32:20 10.22.22.3 tulip Jun 16 13:32:20 10.22.22.3 r8169 Jun 16 13:32:20 10.22.22.3 sky2 Jun 16 13:32:20 10.22.22.3 via_velocity Jun 16 13:32:20 10.22.22.3 via_rhine Jun 16 13:32:20 10.22.22.3 sis900 Jun 16 13:32:20 10.22.22.3 ne2k_pci Jun 16 13:32:20 10.22.22.3 8390 Jun 16 13:32:20 10.22.22.3 skge Jun 16 13:32:20 10.22.22.3 tg3 Jun 16 13:32:20 10.22.22.3 8139too Jun 16 13:32:20 10.22.22.3 e1000 Jun 16 13:32:20 10.22.22.3 e100 Jun 16 13:32:20 10.22.22.3 usb_storage Jun 16 13:32:20 10.22.22.3 mtdblock Jun 16 13:32:20 10.22.22.3 mtd_blkdevs Jun 16 13:32:20 10.22.22.3 usbhid Jun 16 13:32:20 10.22.22.3 uhci_hcd Jun 16 13:32:20 10.22.22.3 ehci_hcd Jun 16 13:32:20 10.22.22.3 ohci_hcd Jun 16 13:32:20 10.22.22.3 usbcore Jun 16 13:32:20 10.22.22.3 [last unloaded: nf_conntrack] Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 [ 18.026103] Jun 16 13:32:20 10.22.22.3 [ 18.026103] Pid: 7, comm: events/0 Not tainted (2.6.26-rc6-git2-build-0029 #17) Jun 16 13:32:20 10.22.22.3 [ 18.026103] EIP: 0060:[<c02469ba>] EFLAGS: 00010206 CPU: 0 Jun 16 13:32:20 10.22.22.3 [ 18.026103] EIP is at dev_kfree_skb_irq+0x6/0x3c Jun 16 13:32:20 10.22.22.3 [ 18.026103] EAX: 00000000 EBX: f748a000 ECX: 00000000 EDX: f748b028 Jun 16 13:32:20 10.22.22.3 [ 18.026103] ESI: f748a500 EDI: 00000bd9 EBP: c08d4f88 ESP: c08d4f84 Jun 16 13:32:20 10.22.22.3 [ 18.026103] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Jun 16 13:32:20 10.22.22.3 [ 18.026103] Process events/0 (pid: 7, ti=c08d4000 task=f7c31810 task.ti=f7c3d000) Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 [ 18.026103] Stack: Jun 16 13:32:20 10.22.22.3 f748a000 Jun 16 13:32:20 10.22.22.3 c08d4fbc Jun 16 13:32:20 10.22.22.3 f8955eff Jun 16 13:32:20 10.22.22.3 f748b028 Jun 16 13:32:20 10.22.22.3 00000040 Jun 16 13:32:20 10.22.22.3 f748a50c Jun 16 13:32:20 10.22.22.3 f8894000 Jun 16 13:32:20 10.22.22.3 00000000 Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 [ 18.026103] Jun 16 13:32:20 10.22.22.3 30000a29 Jun 16 13:32:20 10.22.22.3 f748b02c Jun 16 13:32:20 10.22.22.3 00000089 Jun 16 13:32:20 10.22.22.3 f748a50c Jun 16 13:32:20 10.22.22.3 00000040 Jun 16 13:32:20 10.22.22.3 00000000 Jun 16 13:32:20 10.22.22.3 c08d4fe0 Jun 16 13:32:20 10.22.22.3 c0248096 Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 [ 18.026103] Jun 16 13:32:20 10.22.22.3 c1fdf3f4 Jun 16 13:32:20 10.22.22.3 0000000a Jun 16 13:32:20 10.22.22.3 c08d4ff8 Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 rtl8169_poll+0x94/0x152 [r8169] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 net_rx_action+0x8f/0x199 Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 do_softirq+0x55/0x89 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c013e23e>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 handle_fasteoi_irq+0x0/0xaa Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c0122878>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 irq_exit+0x38/0x6b Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c0105ef2>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 do_IRQ+0xa0/0xb6 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c01041d7>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 common_interrupt+0x23/0x28 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c0241cb7>] Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c0241ce3>] Jun 16 13:32:20 10.22.22.3 kfree_skb+0x29/0x2b Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<f8955896>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 rtl8169_tx_clear+0x4a/0x78 [r8169] Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<f89573e1>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 rtl8169_reset_task+0x3f/0xd1 [r8169] Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<f89573a2>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 rtl8169_reset_task+0x0/0xd1 [r8169] Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c012b16d>] Jun 16 13:32:20 10.22.22.3 worker_thread+0x0/0x85 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c012dc15>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 autoremove_wake_function+0x0/0x33 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c012db42>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 kthread+0x3b/0x61 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c012db07>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 kthread+0x0/0x61 Jun 16 13:32:20 10.22.22.3 [ 18.026103] [<c0104417>] Jun 16 13:32:20 10.22.22.3 ? Jun 16 13:32:20 10.22.22.3 kernel_thread_helper+0x7/0x10 Jun 16 13:32:20 10.22.22.3 [ 18.026103] ======================= Jun 16 13:32:20 10.22.22.3 [ 18.026103] Code: Jun 16 13:32:20 10.22.22.3 89 Jun 16 13:32:20 10.22.22.3 34 Jun 16 13:32:20 10.22.22.3 38 Jun 16 13:32:20 10.22.22.3 80 Jun 16 13:32:20 10.22.22.3 63 Jun 16 13:32:20 10.22.22.3 64 Jun 16 13:32:20 10.22.22.3 f3 Jun 16 13:32:20 10.22.22.3 31 Jun 16 13:32:20 10.22.22.3 c0 Jun 16 13:32:20 10.22.22.3 eb Jun 16 13:32:20 10.22.22.3 d2 Jun 16 13:32:20 10.22.22.3 31 Jun 16 13:32:20 10.22.22.3 c9 Jun 16 13:32:20 10.22.22.3 6a Jun 16 13:32:20 10.22.22.3 20 Jun 16 13:32:20 10.22.22.3 89 Jun 16 13:32:20 10.22.22.3 d8 Jun 16 13:32:20 10.22.22.3 e8 Jun 16 13:32:20 10.22.22.3 17 Jun 16 13:32:20 10.22.22.3 b4 Jun 16 13:32:20 10.22.22.3 ff Jun 16 13:32:20 10.22.22.3 ff Jun 16 13:32:20 10.22.22.3 5a Jun 16 13:32:20 10.22.22.3 85 Jun 16 13:32:20 10.22.22.3 c0 Jun 16 13:32:20 10.22.22.3 74 Jun 16 13:32:20 10.22.22.3 c7 Jun 16 13:32:20 10.22.22.3 8d Jun 16 13:32:20 10.22.22.3 65 Jun 16 13:32:20 10.22.22.3 f4 Jun 16 13:32:20 10.22.22.3 5b Jun 16 13:32:20 10.22.22.3 5e Jun 16 13:32:20 10.22.22.3 5f Jun 16 13:32:20 10.22.22.3 5d Jun 16 13:32:20 10.22.22.3 c3 Jun 16 13:32:20 10.22.22.3 55 Jun 16 13:32:20 10.22.22.3 89 Jun 16 13:32:20 10.22.22.3 c1 Jun 16 13:32:20 10.22.22.3 89 Jun 16 13:32:20 10.22.22.3 e5 Jun 16 13:32:20 10.22.22.3 53 Jun 16 13:32:20 10.22.22.3 unparseable log message: "<f0> " Jun 16 13:32:20 10.22.22.3 ff Jun 16 13:32:20 10.22.22.3 88 Jun 16 13:32:20 10.22.22.3 ac Jun 16 13:32:20 10.22.22.3 00 Jun 16 13:32:20 10.22.22.3 00 Jun 16 13:32:20 10.22.22.3 00 Jun 16 13:32:20 10.22.22.3 0f Jun 16 13:32:20 10.22.22.3 94 Jun 16 13:32:20 10.22.22.3 c0 Jun 16 13:32:20 10.22.22.3 84 Jun 16 13:32:20 10.22.22.3 c0 Jun 16 13:32:20 10.22.22.3 74 Jun 16 13:32:20 10.22.22.3 25 Jun 16 13:32:20 10.22.22.3 9c Jun 16 13:32:20 10.22.22.3 5b Jun 16 13:32:20 10.22.22.3 fa Jun 16 13:32:20 10.22.22.3 64 Jun 16 13:32:20 10.22.22.3 8b Jun 16 13:32:20 10.22.22.3 15 Jun 16 13:32:20 10.22.22.3 00 Jun 16 13:32:20 10.22.22.3 Jun 16 13:32:20 10.22.22.3 [ 18.026103] EIP: [<c02469ba>] Jun 16 13:32:20 10.22.22.3 dev_kfree_skb_irq+0x6/0x3c Jun 16 13:32:20 10.22.22.3 SS:ESP 0068:c08d4f84 Jun 16 13:32:20 10.22.22.3 [ 18.032435] Kernel panic - not syncing: Fatal exception in interrupt Jun 16 13:32:20 10.22.22.3 [ 18.032507] Rebooting in 70 seconds.. > > -- > Ueimor > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Denys Fedoryshchenko Technical Manager Virtual ISP S.A.L. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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