[E1000-devel] FWD: [PRO/1000 fiber nic pci id mismatch]

[Jaakko N. <Jaakko.Niemi@F-Secure.com>]

 Hello,
 
 Anyone have comments regarding this issue?

----- Forwarded message -----

From: Jaakko Niemi <Jaakko.Niemi@F-Secure.com>
To: lin...@in...
Date: Fri, 30 Jan 2004 09:27:41 +0200
Subject: PRO/1000 fiber nic pci id mismatch

 Hello,

 Recently we upgraded kernel on a server to 2.4.24, and
 started seeing packet loss on workloads with which the
 machine was happy with 2.4.21 kernel. After digging for
 a while, we noticed that pci id for the card was wrong.
 We have a few of these 717037-005 fiber cards, and on
 all machines they are reported as:

01:06.0 Ethernet controller: Intel Corp. 82544EI Gigabit Ethernet Controller (rev 02)
        Subsystem: Intel Corp.: Unknown device 1109
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
        Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-<TAbort- <MAbort- >SERR- <PERR-
        Latency: 32 (63750ns min), cache line size 10
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at fcf20000 (32-bit, non-prefetchable) [size=128K]
        Region 1: Memory at fcf00000 (32-bit, non-prefetchable) [size=128K]
        Region 2: I/O ports at cce0 [size=32]
        Expansion ROM at fcb00000 [disabled] [size=128K]
        Capabilities: [dc] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=1 PME-
        Capabilities: [e4] #07 [0002]
        Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
                Address: 0000000000000000  Data: 0000

 As far as I can see, the bus speed is also wrong, as these cards
 should be capable only to 33Mhz. 

 I suppose this issue has been there quite long, but we did not
 see it with 2.4.21 as it sets RxDescriptors to 80 by default.
 The newer driver in 2.4.24 sets it to 256. According to docs,
 82542 should handle that, but we were seeing packet loss with
 roughly 20kpps. After dropping RxDescriptors to 224, we did 
 not see any packet loss anymore. 

 I'd send in a patch, but I have no idea pci id should be and
 whether the id for 82544EI is correct or not. This is not a 
 bug in the driver, but I thought you might want to be aware 
 of the issue anyway. 

----- End forwarded message -----

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