[2.6.18-rc7-mm1] slow boot

[Tilman Schmidt <tilman@imap.cc>]

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FYI: On my Dell OptiPlex GX110 (Intel Pentium III, 933 MHz, 512 MB
RAM, i810 chipset), kernel 2.6.18-rc7-mm1 takes drastically longer
to boot than 2.6.18 mainline release. Some data points from the
respective dmesg outputs:

<<<<<<< 2.6.18
<4>[   26.332472] PID hash table entries: 2048 (order: 11, 8192 bytes)
<4>[   26.334415] Console: colour VGA+ 80x25
>>>>>>> 2.6.18-rc7-mm1
<4>[   32.102004] PID hash table entries: 2048 (order: 11, 8192 bytes)
<4>[   32.174041] Console: colour VGA+ 80x25

Strange delay in mm wrt mainline. (There are several of these.)

<<<<<<< 2.6.18
<4>[   26.336075] ------------------------
<4>[   26.336130] | Locking API testsuite:
<4>[   26.336187] ----------------------------------------------------------------------------
<4>[   26.336270]                                  | spin |wlock |rlock |mutex | wsem | rsem |
<4>[   26.336352]   --------------------------------------------------------------------------
<4>[   26.336451]                      A-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
<4>[   26.338380]                  A-B-B-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
<4>[   26.340249]              A-B-B-C-C-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
...
<4>[   26.408007] Good, all 218 testcases passed! |
<4>[   26.408065] ---------------------------------
>>>>>>> 2.6.18-rc7-mm1
<4>[   32.183079] ------------------------
<4>[   32.183134] | Locking API testsuite:
<4>[   32.183190] ----------------------------------------------------------------------------
<4>[   32.183273]                                  | spin |wlock |rlock |mutex | wsem | rsem |
<4>[   32.183356]   --------------------------------------------------------------------------
<4>[   32.183452]                      A-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
<4>[   32.273613]                  A-B-B-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
<4>[   32.497062]              A-B-B-C-C-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
...
<4>[   39.746662] Good, all 218 testcases passed! |
<4>[   39.746720] ---------------------------------

All locking API tests are extremely slow (tenths of seconds in mm,
milliseconds in mainline.) By the end of the testsuite, the mm
kernel has already lost 13 seconds on the mainline kernel.

<<<<<<< 2.6.18
<4>[   26.596570] evxfevnt-0089 [02] enable                : Transition to ACPI mode successful
<6>[   26.708752] NET: Registered protocol family 16
>>>>>>> 2.6.18-rc7-mm1
<4>[   40.787142] evxfevnt-0089 [02] enable                : Transition to ACPI mode successful
<6>[   41.329553] NET: Registered protocol family 16

<<<<<<< 2.6.18
<6>[   26.749162] ACPI: Assume root bridge [\_SB_.PCI0] bus is 0
<7>[   26.757435] Boot video device is 0000:00:01.0
>>>>>>> 2.6.18-rc7-mm1
<6>[   42.025638] ACPI: Assume root bridge [\_SB_.PCI0] bus is 0
<7>[   42.435641] Boot video device is 0000:00:01.0

More inexplicable delays.

<<<<<<< 2.6.18
<6>[   30.233858] PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
<6>[   30.242857] serio: i8042 AUX port at 0x60,0x64 irq 12
<6>[   30.249613] serio: i8042 KBD port at 0x60,0x64 irq 1
<6>[   30.257604] mice: PS/2 mouse device common for all mice
<6>[   30.265941] input: PC Speaker as /class/input/input0
<6>[   30.304365] input: AT Translated Set 2 keyboard as /class/input/input1
>>>>>>> 2.6.18-rc7-mm1
<6>[   56.409925] PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
<6>[   56.660486] serio: i8042 AUX port at 0x60,0x64 irq 12
<6>[   57.028188] serio: i8042 KBD port at 0x60,0x64 irq 1
<6>[   57.036853] mice: PS/2 mouse device common for all mice
<6>[   58.532944] input: PC Speaker as /devices/platform/pcspkr/input0
<6>[   59.224917] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio1/input1
<6>[   61.408168] input: ImPS/2 Generic Wheel Mouse as /devices/platform/i8042/serio0/input2

Keyboard and mouse detection take 100x as long as normal.

<<<<<<< 2.6.18
<6>[   37.446763] md: ... autorun DONE.
<6>[   38.578832] NTFS driver 2.1.27 [Flags: R/W MODULE].
<6>[   38.771306] NTFS volume version 3.1.
>>>>>>> 2.6.18-rc7-mm1
<6>[   73.384371] md: ... autorun DONE.
<6>[   73.565190] warning: process `showconsole' used the removed sysctl system call
<6>[   75.436369] NTFS driver 2.1.27 [Flags: R/W MODULE].
<6>[   75.637003] NTFS volume version 3.1.

In the end, the mm kernel has taken twice as much time to get up
and running as the mainline kernel.

Please let me know if you need more information.

-- 
Tilman Schmidt                          E-Mail: tilman@imap.cc
Bonn, Germany
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