Something happened in between kernel 2.6.12 and 2.6.14-rc2, where
disk performance went 20X slower on the latest release kernel. I
suspect it has something to do with the fusion driver. This showed
up in the boot log: "mptscsih: ioc0: DV: Release failed." is it
significant?
2.6.12
[root]# hdparm -t /dev/sdc
Timing buffered disk reads: 174 MB in 3.03 seconds = 57.44 MB/sec
2.6.14-rc2
[root]# hdparm -t /dev/sdc
Timing buffered disk reads: 8 MB in 3.16 seconds = 2.53 MB/sec
Partial boot log with 2.6.14-rc2:
Fusion MPT base driver 3.03.02
Copyright (c) 1999-2005 LSI Logic Corporation
Fusion MPT SPI Host driver 3.03.02
GSI 28 (level, low) -> CPU 0 (0xc618) vector 49
ACPI: PCI Interrupt 0000:06:02.0[A] -> GSI 28 (level, low) -> IRQ 49
mptbase: Initiating ioc0 bringup
ioc0: 53C1030: Capabilities={Initiator}
scsi0 : ioc0: LSI53C1030, FwRev=01030a00h, Ports=1, MaxQ=255, IRQ=49
Vendor: MAXTOR Model: ATLAS10K3_18_SCA Rev: B000
Type: Direct-Access ANSI SCSI revision: 03
SCSI device sda: 35916548 512-byte hdwr sectors (18389 MB)
SCSI device sda: drive cache: write back
SCSI device sda: 35916548 512-byte hdwr sectors (18389 MB)
SCSI device sda: drive cache: write back
sda: sda1 sda2 sda3
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Vendor: QUANTUM Model: ATLAS IV 9 SCA Rev: 0B0B
Type: Direct-Access ANSI SCSI revision: 03
SCSI device sdb: 17942584 512-byte hdwr sectors (9187 MB)
SCSI device sdb: drive cache: write back
SCSI device sdb: 17942584 512-byte hdwr sectors (9187 MB)
SCSI device sdb: drive cache: write back
sdb: sdb1
Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
Vendor: SEAGATE Model: ST336752LC Rev: 0004
Type: Direct-Access ANSI SCSI revision: 03
SCSI device sdc: 71687369 512-byte hdwr sectors (36704 MB)
SCSI device sdc: drive cache: write back
SCSI device sdc: 71687369 512-byte hdwr sectors (36704 MB)
SCSI device sdc: drive cache: write back
sdc: sdc1 sdc2
Attached scsi disk sdc at scsi0, channel 0, id 2, lun 0
Vendor: ESG-SHV Model: SCA HSBP M17 Rev: 1.0D
Type: Processor ANSI SCSI revision: 02
GSI 29 (level, low) -> CPU 3 (0xc018) vector 50
ACPI: PCI Interrupt 0000:06:02.1[B] -> GSI 29 (level, low) -> IRQ 50
mptbase: Initiating ioc1 bringup
mptscsih: ioc0: DV: Release failed. id 0<6>ioc1: 53C1030: Capabilities={Initiator}
scsi1 : ioc1: LSI53C1030, FwRev=01030a00h, Ports=1, MaxQ=255, IRQ=50
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