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author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-19 15:56:05 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-19 15:56:05 -0800 |
commit | cf8c0d1dbcfaba56adde85b63190a8bceda0cd04 (patch) | |
tree | 870e47b308d77527d3e161f86832b66f44dfd45a /Documentation | |
parent | d5c67bac833c6c9cc713f6a27daa77dcba898dd8 (diff) | |
parent | 156fbc3fbe4ab640297b1ae2092821363840aeb6 (diff) | |
download | linux-cf8c0d1dbcfaba56adde85b63190a8bceda0cd04.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86
* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: (32 commits)
x86: fix page_is_ram() thinko
x86: fix WARN_ON() message: teach page_is_ram() about the special 4Kb bios data page
x86: i8259A: remove redundant irq_descinitialization
x86: fix vdso_install breaks user "make install"
x86: change IO delay back to 0x80
x86: lds - Use THREAD_SIZE instead of numeric constant
x86: lds - Use PAGE_SIZE instead of numeric constant
x86 cleanup: suspend_asm_64.S - use X86_CR4_PGE instead of numeric value
x86: docs fixes to Documentation/i386/IO-APIC.txt
x86: fix printout ugliness in cpu info printk
x86: clean up csum-wrappers_64.c some more
x86: coding style fixes in arch/x86/lib/csum-wrappers_64.c
x86: coding style fixes in arch/x86/lib/io_64.c
x86: exclude vsyscall files from stackprotect
x86: add pgd_large() on 64-bit, for consistency
x86: minor cleanup of comments in processor.h
x86: annotate pci/common.s:pci_scan_bus_with_sysdata with __devinit
x86: fix section mismatch in head_64.S:initial_code
x86: fix section mismatch in srat_64.c:reserve_hotadd
x86: fix section mismatch warning in topology.c:arch_register_cpu
...
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/i386/IO-APIC.txt | 32 | ||||
-rw-r--r-- | Documentation/kernel-parameters.txt | 2 |
2 files changed, 17 insertions, 17 deletions
diff --git a/Documentation/i386/IO-APIC.txt b/Documentation/i386/IO-APIC.txt index 435e69e6e9aa..f95166645d29 100644 --- a/Documentation/i386/IO-APIC.txt +++ b/Documentation/i386/IO-APIC.txt @@ -1,12 +1,14 @@ Most (all) Intel-MP compliant SMP boards have the so-called 'IO-APIC', -which is an enhanced interrupt controller, it enables us to route -hardware interrupts to multiple CPUs, or to CPU groups. +which is an enhanced interrupt controller. It enables us to route +hardware interrupts to multiple CPUs, or to CPU groups. Without an +IO-APIC, interrupts from hardware will be delivered only to the +CPU which boots the operating system (usually CPU#0). Linux supports all variants of compliant SMP boards, including ones with -multiple IO-APICs. (multiple IO-APICs are used in high-end servers to -distribute IRQ load further). +multiple IO-APICs. Multiple IO-APICs are used in high-end servers to +distribute IRQ load further. -There are (a few) known breakages in certain older boards, which bugs are +There are (a few) known breakages in certain older boards, such bugs are usually worked around by the kernel. If your MP-compliant SMP board does not boot Linux, then consult the linux-smp mailing list archives first. @@ -28,18 +30,18 @@ If your box boots fine with enabled IO-APIC IRQs, then your hell:~> <---------------------------- -some interrupts are still listed as 'XT PIC', but this is not a problem, +Some interrupts are still listed as 'XT PIC', but this is not a problem; none of those IRQ sources is performance-critical. -in the unlikely case that your board does not create a working mp-table, +In the unlikely case that your board does not create a working mp-table, you can use the pirq= boot parameter to 'hand-construct' IRQ entries. This -is nontrivial though and cannot be automated. One sample /etc/lilo.conf +is non-trivial though and cannot be automated. One sample /etc/lilo.conf entry: append="pirq=15,11,10" -the actual numbers depend on your system, on your PCI cards and on their +The actual numbers depend on your system, on your PCI cards and on their PCI slot position. Usually PCI slots are 'daisy chained' before they are connected to the PCI chipset IRQ routing facility (the incoming PIRQ1-4 lines): @@ -54,7 +56,7 @@ lines): PIRQ1 ----| |- `----| |- `----| |- `----| |--------| | `-' `-' `-' `-' `-' -every PCI card emits a PCI IRQ, which can be INTA,INTB,INTC,INTD: +Every PCI card emits a PCI IRQ, which can be INTA, INTB, INTC or INTD: ,-. INTD--| | @@ -95,21 +97,21 @@ card (IRQ11) in Slot3, and have Slot1 empty: [value '0' is a generic 'placeholder', reserved for empty (or non-IRQ emitting) slots.] -generally, it's always possible to find out the correct pirq= settings, just +Generally, it's always possible to find out the correct pirq= settings, just permute all IRQ numbers properly ... it will take some time though. An 'incorrect' pirq line will cause the booting process to hang, or a device -won't function properly (if it's inserted as eg. a module). +won't function properly (e.g. if it's inserted as a module). -If you have 2 PCI buses, then you can use up to 8 pirq values. Although such +If you have 2 PCI buses, then you can use up to 8 pirq values, although such boards tend to have a good configuration. Be prepared that it might happen that you need some strange pirq line: append="pirq=0,0,0,0,0,0,9,11" -use smart try-and-err techniques to find out the correct pirq line ... +Use smart trial-and-error techniques to find out the correct pirq line ... -good luck and mail to linux-smp@vger.kernel.org or +Good luck and mail to linux-smp@vger.kernel.org or linux-kernel@vger.kernel.org if you have any problems that are not covered by this document. diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a4fc7fc21439..7278295f94d2 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1056,8 +1056,6 @@ and is between 256 and 4096 characters. It is defined in the file [SCSI] Maximum number of LUNs received. Should be between 1 and 16384. - mca-pentium [BUGS=X86-32] - mcatest= [IA-64] mce [X86-32] Machine Check Exception |