I just retried this today (after noting a new tag upstream, I was thinking I have not seen this in a while) and was unable to reproduce the problem using the suspend feature.    I note that I now have a 3.2 kernel and see some info on jumbo frames in my dmesg.  No other notable changes jump out at me in the outputs below. 

imac@repo:~$ dmesg | grep r8169
[    2.146842] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[    2.146873] r8169 0000:0a:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[    2.146948] r8169 0000:0a:00.0: setting latency timer to 64
[    2.147003] r8169 0000:0a:00.0: irq 45 for MSI/MSI-X
[    2.147546] r8169 0000:0a:00.0: eth0: RTL8168c/8111c at 0xffffc9000278a000, 00:1e:ec:f2:0f:f3, XID 1c4000c0 IRQ 45
[    2.147550] r8169 0000:0a:00.0: eth0: jumbo features [frames: 6128 bytes, tx checksumming: ko]
[   40.985137] r8169 0000:0a:00.0: eth0: link down
[   40.985147] r8169 0000:0a:00.0: eth0: link down
[   43.084541] r8169 0000:0a:00.0: eth0: link up

imac@repo:~$ uname -a
Linux repo.ianbmacdonald.com 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

imac@repo:~$ sudo lspci  -vvv -d 10ec:8168
[sudo] password for imac: 
0a:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
	Subsystem: Hewlett-Packard Company Device 30fc
	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, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 45
	Region 0: I/O ports at 2000 [size=256]
	Region 2: Memory at d1010000 (64-bit, prefetchable) [size=4K]
	Region 4: Memory at d1000000 (64-bit, prefetchable) [size=64K]
	Expansion ROM at d1020000 [disabled] [size=64K]
	Capabilities: [40] Power Management version 3
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [50] MSI: Enable+ Count=1/2 Maskable- 64bit+
		Address: 00000000fee0300c  Data: 4191
	Capabilities: [70] Express (v1) Endpoint, MSI 01
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <512ns, L1 <8us
			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 4096 bytes
		DevSta:	CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <64us
			ClockPM+ Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
	Capabilities: [b0] MSI-X: Enable- Count=2 Masked-
		Vector table: BAR=4 offset=00000000
		PBA: BAR=4 offset=00000800
	Capabilities: [d0] Vital Product Data
		Unknown small resource type 00, will not decode more.
	Capabilities: [100 v1] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
	Capabilities: [140 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
			Status:	NegoPending- InProgress-
	Capabilities: [160 v1] Device Serial Number 00-00-00-00-00-00-00-00
	Kernel driver in use: r8169
	Kernel modules: r8169

imac@repo:~$