[Bug 612911] [NEW] poor ethernet performance on Broadcom BCM5722

[sunta]

Public bug reported:

Booting 2.6.24-28-server on a Dell R300 with  Broadcom BCM5722 results
in <10kb/s network performance. reverting to 2.6.24-23-server gives full
network performance.

02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722 Gigabit Ethernet PCI Express
	Subsystem: Dell PowerEdge R300
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 17
	Region 0: Memory at dfef0000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: [48] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=1 PME-
	Capabilities: [50] Vital Product Data
	Capabilities: [58] Vendor Specific Information
	Capabilities: [e8] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
		Address: abf77bfd79cdfef4  Data: 1df8
	Capabilities: [d0] Express Endpoint IRQ 0
		Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag+
		Device: Latency L0s <4us, L1 unlimited
		Device: AtnBtn- AtnInd- PwrInd-
		Device: Errors: Correctable- Non-Fatal- Fatal+ Unsupported-
		Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
		Device: MaxPayload 128 bytes, MaxReadReq 4096 bytes
		Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s, Port 0
		Link: Latency L0s <4us, L1 <64us
		Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch-
		Link: Speed 2.5Gb/s, Width x1

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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poor ethernet performance on Broadcom BCM5722
https://bugs.launchpad.net/bugs/612911
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