PAE Slowdown

Mon Oct 8 09:50:59 PDT 2007

Hey all,

I know that AMD64's the preferred way to run >4 gig systems, but I'm 
having a weird situation with 6.2-RELEASE-p8 and 6-STABLE as of last 
night.  When I compile the PAE kernel, my system performance drops 
like a rock.  It still boots and everything still runs, but for 
instance, running the Flops port my megaflops drop from the 950 
MFLOPS range to 4 MFLOPS.  It feels about as fast as a 486.

I'm not sure what I should try disabling.  I tried nodevice usb, but 
that didn't seem to change anything.  SMP and GENERIC kernels work 
fine.

CPU: Intel Core Duo 2 Quad 2.4ghz
Memory: 8 gig (4 2 gig dimms)
Swap: 16 gig partition

If I try to boot without ACPI disabled the kernel doesn't finish 
booting, it stops after ata7.

Full kernel message listing:

Copyright (c) 1992-2007 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-RELEASE-p8 #0: Mon Oct  8 11:04:03 CDT 2007
     root at ein.polycot.com:/usr/src/sys/i386/compile/PAE
ACPI APIC Table: <INTEL  DP965LT >
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Quad CPU           @ 2.40GHz (2412.00-MHz 
686-class CPU)
   Origin = "GenuineIntel"  Id = 0x6f7  Stepping = 7

Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
   Features2=0xe3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,<b9>,CX16,<b14>,<b15>>
   AMD Features=0x20100000<NX,LM>
   AMD Features2=0x1<LAHF>
   Cores per package: 4
real memory  = 9059696640 (8640 MB)
avail memory = 8340590592 (7954 MB)
ioapic0: Changing APIC ID to 2
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <INTEL DP965LT> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_perf0: <ACPI CPU Frequency Control> on cpu0
acpi_perf0: failed in PERF_STATUS attach
device_attach: acpi_perf0 attach returned 6
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_perf0: <ACPI CPU Frequency Control> on cpu0
acpi_perf0: failed in PERF_STATUS attach
device_attach: acpi_perf0 attach returned 6
acpi_button0: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
3ware device driver for 9000 series storage controllers, version: 3.60.03.006
twa0: <3ware 9000 series Storage Controller> port 0x3000-0x30ff mem 
0xe8000000-0xe9ffffff,0xea200000-0xea200fff irq 16 at device 0.0 on 
pci1
twa0: [GIANT-LOCKED]
twa0: INFO: (0x15: 0x1300): Controller details:: Model 9650SE-4LPML, 
4 ports, Firmware FE9X 3.08.02.005, BIOS BE9X 3.08.00.002
pci0: <simple comms> at device 3.0 (no driver attached)
em0: <Intel(R) PRO/1000 Network Connection Version - 6.2.9> port 
0x40c0-0x40df mem 0xea300000-0xea31ffff,0xea320000-0xea320fff irq 20 
at device 25.0 on pci0
em0: Ethernet address: 00:19:d1:b0:d5:d0
pci0: <serial bus, USB> at device 26.0 (no driver attached)
pci0: <serial bus, USB> at device 26.1 (no driver attached)
pci0: <serial bus, USB> at device 26.7 (no driver attached)
pcib2: <ACPI PCI-PCI bridge> at device 28.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> at device 28.1 on pci0
pci3: <ACPI PCI bus> on pcib3
atapci0: <GENERIC ATA controller> port 
0x2018-0x201f,0x2024-0x2027,0x2010-0x2017,0x2020-0x2023,0x2000-0x200f 
mem 0xea100000-0xea1001ff irq 17 at device 0.0 on pci3
ata2: <ATA channel 0> on atapci0
ata3: <ATA channel 1> on atapci0
pcib4: <ACPI PCI-PCI bridge> at device 28.2 on pci0
pci4: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 28.3 on pci0
pci5: <ACPI PCI bus> on pcib5
pcib6: <ACPI PCI-PCI bridge> at device 28.4 on pci0
pci6: <ACPI PCI bus> on pcib6
pci0: <serial bus, USB> at device 29.0 (no driver attached)
pci0: <serial bus, USB> at device 29.1 (no driver attached)
pci0: <serial bus, USB> at device 29.2 (no driver attached)
pci0: <serial bus, USB> at device 29.7 (no driver attached)
pcib7: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci7: <ACPI PCI bus> on pcib7
pci7: <display, VGA> at device 0.0 (no driver attached)
fwohci0: <Texas Instruments TSB43AB22/A> mem 
0xea084000-0xea0847ff,0xea080000-0xea083fff irq 19 at device 3.0 on 
pci7
fwohci0: OHCI version 1.10 (ROM=0)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:90:27:00:01:e7:67:5e
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 02:90:27:e7:67:5e
fwe0: Ethernet address: 02:90:27:e7:67:5e
fwe0: if_start running deferred for Giant
sbp0: <SBP-2/SCSI over FireWire> on firewire0
fwohci0: Initiate bus reset
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
firewire0: bus manager 0 (me)
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci1: <Intel ICH8 SATA300 controller> port 
0x4438-0x443f,0x444c-0x444f,0x4430-0x4437,0x4448-0x444b,0x4410-0x441f,0x4400-0x440f 
irq 19 at device 31.2 on pci0
ata4: <ATA channel 0> on atapci1
ata5: <ATA channel 1> on atapci1
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
atapci2: <Intel ICH8 SATA300 controller> port 
0x4428-0x442f,0x4444-0x4447,0x4420-0x4427,0x4440-0x4443,0x40f0-0x40ff,0x40e0-0x40ef 
irq 19 at device 31.5 on pci0
ata6: <ATA channel 0> on atapci2
ata7: <ATA channel 1> on atapci2
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xc0000-0xcafff,0xcb000-0xccfff on isa0
ata0 at port 0x1f0-0x1f7,0x3f6 irq 14 on isa0
ata1 at port 0x170-0x177,0x376 irq 15 on isa0
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250 or not responding
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 2411997363 Hz quality 800
Timecounters tick every 1.000 msec
da0 at twa0 bus 0 target 0 lun 0
da0: <AMCC 9650SE-4LP DISK 3.08> Fixed Direct Access SCSI-5 device
da0: 100.000MB/s transfers
da0: 610330MB (1249955840 512 byte sectors: 255H 63S/T 77806C)
Trying to mount root from ufs:/dev/da0s1a

-- 

Jeff Kramer
jeffk at well.com
http://www.jeffkramer.org/