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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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