Messages in this thread | | | From | "Rob Mueller" <> | Subject | Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers | Date | Wed, 22 Sep 2010 13:44:51 +1000 |
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> 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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