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rozhodl jsem se pouzit svuj domaci server jako router. Pridal jsem tedy do PCI slotu druhou sitovou kartu (05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)) a nastavil routovani v IPTABLES. Vse funguje bez problemu az na rychlost. S uploadem není problem (80Mb), download je vsak velmi pomaly (2Mb).

Zacal jsem tedy hledat kde je problem. Prvni podezrelou vec jsem nasel ve vypisu ifconfig PCI sitove karty (slouzi jako WAN).

RX packets:20176 errors:1511 dropped:1512 overruns:1511 frame:0
          TX packets:20124 errors:0 dropped:0 overruns:5 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:16304768 (15.5 MiB)  TX bytes:10554846 (10.0 MiB)
          Interrupt:20 Base address:0xd000

Predpokladam ze vysoky pocet overruns znamena ze jadro nestiha zpracovavat prijate packety.

Pri dalsim patrani jsem nasel podezrele hlaseni v dmesg:

0.353172 pci 0000:05:00.0: BAR 6: address space collision on of device [0xdfc00000-0xdfc0ffff].

Dale pridavam zkraceny vypis z dmesg.

[    0.248480] pci 0000:05:00.0: reg 10 io port: [0xd000-0xd0ff]
[    0.248500] pci 0000:05:00.0: reg 14 32bit mmio: [0xdfc10000-0xdfc100ff]
[    0.248548] pci 0000:05:00.0: reg 30 32bit mmio pref: [0xdfc00000-0xdfc0ffff]
[    0.248587] pci 0000:05:00.0: supports D1 D2
[    0.248597] pci 0000:05:00.0: PME# supported from D1 D2 D3hot D3cold
[    0.248611] pci 0000:05:00.0: PME# disabled
[    0.248693] pci 0000:00:1e.0: transparent bridge
[    0.248707] pci 0000:00:1e.0: bridge io port: [0xd000-0xdfff]
[    0.248721] pci 0000:00:1e.0: bridge 32bit mmio: [0xdfc00000-0xdfcfffff]
...

[    0.353172] pci 0000:05:00.0: BAR 6: address space collision on of device [0xdfc00000-0xdfc0ffff]

Zda se tedy ze ovladac sitove karty pozaduje urcity adresni prostor ktery se kryje s prostorem pozadovanym chipsetem (asi).

vyber z lspci -vv

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) (prog-if 01 [Subtractive decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Bus: primary=00, secondary=05, subordinate=05, sec-latency=32
        I/O behind bridge: 0000d000-0000dfff
        Memory behind bridge: dfc00000-dfcfffff
        Prefetchable memory behind bridge: 0000000040000000-00000000400fffff
        Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
        BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
                PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
        Capabilities: [50] Subsystem: Intel Corporation 82801 Mobile PCI Bridge

05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
        Subsystem: Compex FN22-3(A) LinxPRO Ethernet Adapter
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 32 (8000ns min, 16000ns max)
        Interrupt: pin A routed to IRQ 20
        Region 0: I/O ports at d000 [size=256]
        Region 1: Memory at dfc10000 (32-bit, non-prefetchable) [size=256]
        Expansion ROM at 40000000 [disabled] [size=64K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: 8139too