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    SubjectRe: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers

    > 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
    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+
    RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
    MaxPayload 256 bytes, MaxReadReq 256 bytes
    DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr-
    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-
    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


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