[CentOS] kswapd taking 100% cpu with no swap on system

[Ali Ahsan]

On 05/09/2011 10:08 PM, Ali Ahsan wrote:
> On 05/09/2011 09:45 PM, Lamar Owen wrote:
>> What sort of SATA drives are you using?  There are some known issues with some SATA drives in certain configurations and on some controllers.  It shouldn't cause kswapd to hit high CPU, but it is worth checking out.
>>
> these modules are loaded when i install centos 5.5.
>
>    lsmod | egrep 'ata_piix|libata'
> ata_piix               57285  3
> libata                208977  1 ata_piix
> scsi_mod              199001  5 scsi_dh,sg,usb_storage,libata,sd_mod
>
More info

SCSI subsystem initialized
libata version 3.00 loaded.
ata_piix 0000:00:1f.2: version 2.12
ACPI: PCI Interrupt 0000:00:1f.2[A] -> GSI 19 (level, low) -> IRQ 74
ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ]
PCI: Setting latency timer of device 0000:00:1f.2 to 64
scsi0 : ata_piix
scsi1 : ata_piix
ata1: SATA max UDMA/133 cmd 0x3158 ctl 0x316c bmdma 0x3130 irq 74
ata2: SATA max UDMA/133 cmd 0x3150 ctl 0x3168 bmdma 0x3138 irq 74
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: ATA-8: WDC WD10EARS-003BB1, 80.00A80, max UDMA/133
ata1.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 0/32)
ata1.00: configured for UDMA/133
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2.00: ATA-8: WDC WD10EARS-003BB1, 80.00A80, max UDMA/133
ata2.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 0/32)
ata2.00: configured for UDMA/133
   Vendor: ATA       Model: WDC WD10EARS-003  Rev: 80.0
   Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
  sda: sda1 sda2
sd 0:0:0:0: Attached scsi disk sda
   Vendor: ATA       Model: WDC WD10EARS-003  Rev: 80.0
   Type:   Direct-Access                      ANSI SCSI revision: 05


-- 
S.Ali Ahsan

Senior System Engineer

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