This could be a screwy hardware issue as pointed out before. Certain
controllers restrict the memory that I/O can be done to also (32 bit
controller only able to do I/O to lower 2G?, controller on a PCI bus that
is local only to a particular node) which would make balancing
the file cache difficult.
Ah interesting. Is there an easy way to tell if this is an issue? It's an
ARECA RAID controller, this is the lspci -vvv data from it...
03:00.0 RAID bus controller: Areca Technology Corp. Device 1680
Subsystem: Areca Technology Corp. Device 1680
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 26
Region 0: Memory at b1900000 (32-bit, non-prefetchable) [size=8K]
Expansion ROM at b1c00000 [disabled] [size=64K]
Capabilities: [98] Power Management version 2
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [a0] Message Signalled Interrupts: Mask- 64bit+
Queue=0/1 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [d0] Express (v1) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s
unlimited, L1 <1us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+
Unsupported+
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 256 bytes, MaxReadReq 256 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr-
TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x8, ASPM unknown,
Latency L0 <128ns, L1 unlimited
ClockPM- Suprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain-
CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
Capabilities: [100] Advanced Error Reporting <?>
Kernel driver in use: arcmsr
Rob
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