linux-kernel - Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers

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Date:	Wed, 22 Sep 2010 13:44:51 +1000
From:	"Rob Mueller" <robm@...tmail.fm>
To:	"Christoph Lameter" <cl@...ux.com>, "Mel Gorman" <mel@....ul.ie>
Cc:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	<linux-kernel@...r.kernel.org>,
	"Bron Gondwana" <brong@...tmail.fm>,
	"linux-mm" <linux-mm@...ck.org>
Subject: Re: 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 
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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