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SubjectIO-APIC timer 2.1/2.2
My /proc/interrupts looks like this:

CPU0 CPU1
0: 529340 0 XT-PIC timer
1: 4299 4348 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
3: 482285 490657 IO-APIC-edge serial
4: 39092 38549 IO-APIC-edge serial
5: 2 0 IO-APIC-edge soundblaster
8: 2 0 IO-APIC-edge rtc
13: 1 0 XT-PIC fpu
17: 9503 9528 IO-APIC-level aic7xxx
18: 9858 9779 IO-APIC-level BusLogic BT-958
19: 5399 5293 IO-APIC-level eth0
NMI: 0
ERR: 0

(kernel boot message attached)

The questions:
- Is there anyway I can enable IO-APIC for timer?
- Which one is faster/better IO-APIC-level or edge?

The system is a Dell OptiPlex GxPro dual PPro 200MHz

I am asking this question because there is another machine
(ALR Quad6 dual PPro 200MHz) has IO-APIC-edge for timer...

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+---| Netscape Communicator 4.x |---| Powered by Linux 2.1.x |---+
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-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCS/IT dx s: a- C+++ UL++++$ P- L+++(++++) E--- W++ N+++ o? K? w-- O-
M- V-- PS+ PE Y-- PGP t+@ 5 X+ R- tv- b+ DI? D++(+) G e++ h* r+ y++
------END GEEK CODE BLOCK------Linux version 2.2.0-pre1 (root@krypton.mis.fsw.com.id) (gcc version pgcc-2.90.29 980515 (egcs-1.0.3 release)) #1 SMP Wed Dec 30 19:43:35 JAVT 1998
Intel MultiProcessor Specification v1.4
Virtual Wire compatibility mode.
OEM ID: DELL Product ID: OPTIPLEXGX2 APIC at: 0xFEE00000
Processor #0 Pentium(tm) Pro APIC version 17
Processor #1 Pentium(tm) Pro APIC version 17
I/O APIC #2 Version 17 at 0xFEC00000.
Processors: 2
mapped APIC to ffffe000 (fee00000)
mapped IOAPIC to ffffd000 (fec00000)
Detected 199984983 Hz processor.
Console: colour VGA+ 80x34
Calibrating delay loop... 199.07 BogoMIPS
Memory: 62744k/65536k available (1020k kernel code, 420k reserved, 1032k data, 84k init)
VFS: Diskquotas version dquot_6.4.0 initialized
Checking 386/387 coupling... OK, FPU using exception 16 error reporting.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.26 (19981001) Richard Gooch (rgooch@atnf.csiro.au)
per-CPU timeslice cutoff: 50.24 usecs.
CPU0: Intel Pentium Pro stepping 07
calibrating APIC timer ...
..... CPU clock speed is 199.4418 MHz.
..... APIC bus clock speed is 66.4803 MHz.
Booting processor 1 eip 2000
Calibrating delay loop... 199.07 BogoMIPS
OK.
CPU1: Intel Pentium Pro stepping 07
Total of 2 processors activated (398.13 BogoMIPS).
enabling symmetric IO mode... ...done.
ENABLING IO-APIC IRQs
init IO_APIC IRQs
IO-APIC pin 0, 2, 20, 21, 22, 23 not connected.
...trying to set up timer as ExtINT... .. (found pin 0) ... works.
number of MP IRQ sources: 36.
number of IO-APIC registers: 24.
testing the IO APIC.......................
.... register #00: 00000000
....... : physical APIC id: 00
.... register #01: 00170011
....... : max redirection entries: 0017
....... : IO APIC version: 0011
.... register #02: 00000000
....... : arbitration: 00
.... IRQ redirection table:
NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
00 001 01 0 0 0 0 0 1 7 00
01 000 00 0 0 0 0 0 1 1 59
02 000 00 1 0 0 0 0 0 0 00
03 000 00 0 0 0 0 0 1 1 61
04 000 00 0 0 0 0 0 1 1 69
05 000 00 0 0 0 0 0 1 1 71
06 000 00 0 0 0 0 0 1 1 79
07 000 00 0 0 0 0 0 1 1 81
08 000 00 0 0 0 0 0 1 1 89
09 000 00 0 0 0 0 0 1 1 91
0a 000 00 0 0 0 0 0 1 1 99
0b 000 00 0 0 0 0 0 1 1 A1
0c 000 00 0 0 0 0 0 1 1 A9
0d 000 00 1 0 0 0 0 0 0 00
0e 000 00 0 0 0 0 0 1 1 B1
0f 000 00 0 0 0 0 0 1 1 B9
10 0FF 0F 1 1 0 1 0 1 1 C1
11 0FF 0F 1 1 0 1 0 1 1 C9
12 0FF 0F 1 1 0 1 0 1 1 D1
13 0FF 0F 1 1 0 1 0 1 1 D9
14 000 00 1 0 0 0 0 0 0 00
15 000 00 1 0 0 0 0 0 0 00
16 000 00 1 0 0 0 0 0 0 00
17 000 00 1 0 0 0 0 0 0 00
.................................... done.
PCI: PCI BIOS revision 2.10 entry at 0xfc71e
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI->APIC IRQ transform: (B0,I16,P0) -> 16
PCI->APIC IRQ transform: (B0,I17,P0) -> 17
PCI->APIC IRQ transform: (B1,I8,P0) -> 19
PCI->APIC IRQ transform: (B1,I11,P0) -> 18
PCI: 00:00 [8086/1237]: Passive release enable (00)
Swansea University Computer Society NET3.039 for Linux 2.1
NET3: Unix domain sockets 0.16 for Linux NET3.038.
Swansea University Computer Society TCP/P for NET3.037
IP Protocols: ICMP, UDP, TCP
Swansea University Computer Society IPX 0.38 for NET3.037
IPX Portions Copyright (c) 1995 Caldera, Inc.
Initializing RT netlink socket
Starting kswapd v 1.5
Serial driver version 4.27 with no serial options enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
Real Time Clock Driver v1.09
RAM disk driver initialized: 16 RAM disks of 4096K size
md driver 0.36.6 MAX_MD_DEV=4, MAX_REAL=8
scsi : 0 hosts.
scsi : detected total.
Partition check:
RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem).
(scsi0) <Adaptec AHA-2940A Ultra SCSI host adapter> found at PCI 17/0
(scsi0) Narrow Channel, SCSI ID=7, 3/255 SCBs
(scsi0) Downloading sequencer code... 419 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.6/3.2.4
<Adaptec AHA-2940A Ultra SCSI host adapter>
scsi : 1 host.
Vendor: QUANTUM Model: FIREBALL1080S Rev: 1Q08
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi0:0:0:0) Synchronous at 10.0 Mbyte/sec, offset 8.
Vendor: MICROP Model: 4110-09NB_Nov18F Rev: TN0F
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
(scsi0:0:1:0) Synchronous at 10.0 Mbyte/sec, offset 15.
Vendor: MICROP Model: 4110-09NB_Nov18F Rev: TN0F
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdc at scsi0, channel 0, id 2, lun 0
(scsi0:0:2:0) Synchronous at 10.0 Mbyte/sec, offset 15.
Vendor: MICROP Model: 4110-09NB_Nov18F Rev: TN0F
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdd at scsi0, channel 0, id 3, lun 0
(scsi0:0:3:0) Synchronous at 10.0 Mbyte/sec, offset 15.
Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
Type: CD-ROM ANSI SCSI revision: 02
(scsi0:0:5:0) Synchronous at 5.0 Mbyte/sec, offset 15.
Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
Type: CD-ROM ANSI SCSI revision: 02
Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
Type: CD-ROM ANSI SCSI revision: 02
Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
Type: CD-ROM ANSI SCSI revision: 02
Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
Type: CD-ROM ANSI SCSI revision: 02
Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
Type: CD-ROM ANSI SCSI revision: 02
Vendor: ARCHIVE Model: Python 04106-XXX Rev: 7270
Type: Sequential-Access ANSI SCSI revision: 02
(scsi0:0:6:0) Synchronous at 6.67 Mbyte/sec, offset 15.
SCSI device sda: hdwr sector= 512 bytes. Sectors= 2134305 [1042 MB] [1.0 GB]
sda: sda1 sda2 sda3
SCSI device sdb: hdwr sector= 512 bytes. Sectors= 2053880 [1002 MB] [1.0 GB]
sdb: sdb1 sdb2
SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2053880 [1002 MB] [1.0 GB]
sdc: sdc1 sdc2
SCSI device sdd: hdwr sector= 512 bytes. Sectors= 2053880 [1002 MB] [1.0 GB]
sdd: sdd1 sdd2
scsi: ***** BusLogic SCSI Driver Version 2.1.15 of 17 August 1998 *****
scsi: Copyright 1995-1998 by Leonard N. Zubkoff <lnz@dandelion.com>
scsi1: Configuring BusLogic Model BT-958 PCI Wide Ultra SCSI Host Adapter
scsi1: Firmware Version: 5.06I, I/O Address: 0xECDC, IRQ Channel: 18/Level
scsi1: PCI Bus: 1, Device: 11, Address: 0xFCFFF000, Host Adapter SCSI ID: 7
scsi1: Parity Checking: Enabled, Extended Translation: Disabled
scsi1: Synchronous Negotiation: Fast, Wide Negotiation: Enabled
scsi1: Disconnect/Reconnect: Enabled, Tagged Queuing: Enabled
scsi1: Scatter/Gather Limit: 128 of 8192 segments, Mailboxes: 211
scsi1: Driver Queue Depth: 211, Hos Adapter Queue Depth: 192
scsi1: Tagged Queue Depth: Automatic, Untagged Queue Depth: 3
scsi1: Error Recovery Strategy: Default, SCSI Bus Reset: Enabled
scsi1: SCSI Bus Termination: Both Enabled, SCAM: Disabled
scsi1: *** BusLogic BT-958 Initialized Successfully ***
scsi1 : BusLogic BT-958
scsi : 2 hosts.
Vendor: SEAGATE Model: ST15150W Rev: 0022
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sde at scsi1, channel 0, id 0, lun 0
scsi1: Target 0: Queue Depth 28, Wide Synchronous at 20.0 MB/sec, offset 15
SCSI device sde: hdwr sector= 512 bytes. Sectors= 8388315 [4095 MB] [4.1 GB]
sde: sde1 sde2 sde3 sde4
VFS: Mounted root (ext2 filesystem) readonly.
change_root: old root has d_count=1
Trying to unmount old root ... okay
Freeing unused kernel memory: 84k freed
Adding Swap: 122876k swap-space (priority -1)
Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
SB 4.13 detected OK (220)
YM3812 and OPL-3 driver Copyright (C) by Hannu Savolainen, Rob Hooft 1993-1996
REGISTER_DEV sdb1 to md0 done
REGISTER_DEV sdc1 to md0 done
REGISTER_DEV sdd1 to md0 done
raid0 personality registered
raid0 : Allocating 8 bytes for hash.
REGISTER_DEV sdb2 to md1 done
REGISTER_DEV sdc2 to md1 done
REGISTER_DEV sdd2 to md1 done
raid0 : Allocating 8 bytes for hash.
scsi1: Tagged Queuing now active for Target 0
st: bufsize 32768, wrt 30720, max buffers 4, s/g segs 16.
Detected scsi tape st0 at scsi0, channel 0, id 6, lun 0
3c59x.c:v0.99E 5/12/98 Donald Becker http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
eth0: 3Com 3c590 Vortex 10Mbps at 0xece0, 00:c0:4f:c3:25:a6, IRQ 19
32K byte-wide RAM 1:1 Rx:Tx split, 10baseT interface.
eth0: Overriding PCI latency timer (CFLT) setting of 32, new value is 248.
diald uses obsolete (PF_INET,SOCK_PACKET)
CSLIP: code copyright 1989 Regents of the University of California
SLIP: version 0.8.4-NET3.019-NEWTTY-MODULAR (dynamic channels, max=256).
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