linux/Documentation
Andi Kleen ab9b32ee62 [PATCH] x86_64: Better ATI timer fix
The previous experiment for using apicmaintimer on ATI systems didn't
work out very well.  In particular laptops with C2/C3 support often
don't let it tick during idle, which makes it useless.  There were also
some other bugs that made the apicmaintimer often not used at all.

I tried some other experiments - running timer over RTC and some other
things but they didn't really work well neither.

I rechecked the specs now and it turns out this simple change is
actually enough to avoid the double ticks on the ATI systems.  We just
turn off IRQ 0 in the 8254 and only route it directly using the IO-APIC.

I tested it on a few ATI systems and it worked there.  In fact it worked
on all chipsets (NVidia, Intel, AMD, ATI) I tried it on.

According to the ACPI spec routing should always work through the
IO-APIC so I think it's the correct thing to do anyways (and most of the
old gunk in check_timer should be thrown away for x86-64).

But for 2.6.16 it's best to do a fairly minimal change:
 - Use the known to be working everywhere-but-ATI IRQ0 both over 8254
   and IO-APIC setup everywhere
 - Except on ATI disable IRQ0 in the 8254
 - Remove the code to select apicmaintimer on ATI chipsets
 - Add some boot options to allow to override this (just paranoia)

In 2.6.17 I hope to switch the default over to this for everybody.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-26 09:53:31 -08:00
..
DocBook Fix "stuct", "strut", "struc" typos 2006-01-15 02:12:54 +01:00
RCU [PATCH] RCU documentation fixes (January 2006 update) 2006-02-01 08:53:25 -08:00
aoe
arm [ARM] Add memory.txt to 00-INDEX 2005-12-04 17:56:46 +00:00
block barrier.txt got lost while the new barrier patchset was climbing up 2006-01-16 09:45:58 +01:00
cdrom
connector
cpu-freq [PATCH] cpufreq: documentation for 'ondemand' and 'conservative' 2005-12-01 01:23:23 -08:00
cris
crypto
device-mapper
driver-model [PATCH] Clean up Documentation/driver-model/overview.txt 2006-02-03 08:31:59 -08:00
drivers/edac [PATCH] EDAC: core EDAC support code 2006-01-18 19:20:31 -08:00
dvb V4L/DVB (3336): Bluebird firmware hosting moved to common dvb firmware dir on linuxtv.org 2006-01-09 18:21:40 -02:00
early-userspace
fb [PATCH] Update cyblafb driver 2006-01-09 10:00:36 -08:00
filesystems Merge git://git.kernel.org/pub/scm/linux/kernel/git/aia21/ntfs-2.6 2006-02-24 14:36:42 -08:00
firmware_class
fujitsu/frv [PATCH] FRV: Use virtual interrupt disablement 2006-02-14 16:09:35 -08:00
hwmon [PATCH] w83627hf: Document the reset module parameter 2006-02-13 22:30:09 -08:00
i2c [PATCH] i2c: Rename i2c-sis96x documentation file 2006-02-06 12:02:14 -08:00
i2o spelling: s/retreive/retrieve/ 2006-01-10 00:10:13 +01:00
i386
ia64
infiniband
input Fix "stuct", "strut", "struc" typos 2006-01-15 02:12:54 +01:00
ioctl spelling: s/appropiate/appropriate/ 2006-01-15 02:00:17 +01:00
isdn
kbuild kbuild: remove GCC_VERSION 2006-01-08 19:58:51 +01:00
kdump [PATCH] kdump: add dmesg gdbmacro into document 2006-01-11 18:42:10 -08:00
m68k
mips [MIPS] Update docs to reflect the latest status of the Alchemy IDE driver. 2006-02-14 19:13:23 +00:00
networking [IPV4]: Document icmp_errors_use_inbound_ifaddr sysctl 2006-02-02 17:02:25 -08:00
parisc
pcmcia [PATCH] pcmcia: unify attach, EVENT_CARD_INSERTION handlers into one probe callback 2006-01-06 00:03:24 +01:00
power [PATCH] swsusp: use bytes as image size units 2006-02-01 08:53:12 -08:00
powerpc [PATCH] powerpc: Add FSL USB node to documentation 2006-02-10 16:36:21 +11:00
s390
scsi [SCSI] megaraid_sas: support for 1078 type controller added 2006-02-04 16:38:41 -06:00
serial
sh
sound [ALSA] fix typos in writing-an-alsa-driver 2006-02-01 13:09:31 +01:00
sparc
spi [PATCH] SPI: spi_butterfly, restore lost deltas 2006-02-06 12:17:17 -08:00
sysctl [PATCH] suspend-to-ram: allow video options to be set at runtime 2006-02-20 20:00:10 -08:00
telephony
uml
usb [PATCH] USB: drivers/usb/media/w9968cf.c: remove hooks for the vpp module 2006-01-31 17:23:42 -08:00
video4linux V4L/DVB (3409): Mark Typhoon cards as Lifeview OEM's 2006-01-23 17:06:26 -02:00
vm [PATCH] Direct Migration V9: migrate_pages() extension 2006-02-01 08:53:16 -08:00
w1
watchdog
x86_64 [PATCH] x86_64: Better ATI timer fix 2006-02-26 09:53:31 -08:00
00-INDEX [PATCH] update Documentation/00-INDEX 2005-11-18 10:51:22 -08:00
BUG-HUNTING
Changes [PATCH] remove gcc-2 checks 2006-01-08 20:14:02 -08:00
CodingStyle [PATCH] CodingStyle correction 2006-01-10 08:01:52 -08:00
DMA-API.txt
DMA-ISA-LPC.txt
DMA-mapping.txt
HOWTO [PATCH] Add HOWTO do kernel development document to the Documentation directory 2005-11-18 10:51:21 -08:00
IO-mapping.txt
IPMI.txt
IRQ-affinity.txt
MSI-HOWTO.txt
ManagementStyle
PCIEBUS-HOWTO.txt
README.DAC960
README.cycladesZ
SAK.txt
SecurityBugs
SubmittingDrivers [PATCH] docs: update some updated code docs 2006-01-14 10:39:53 -08:00
SubmittingPatches [PATCH] docs: update some updated code docs 2006-01-14 10:39:53 -08:00
VGA-softcursor.txt
acpi-hotkey.txt
applying-patches.txt [PATCH] Docs update: typos, corrections and additions to applying-patches.txt 2006-01-10 08:01:54 -08:00
atomic_ops.txt [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
basic_profiling.txt
binfmt_misc.txt
cachetlb.txt spelling: s/appropiate/appropriate/ 2006-01-15 02:00:17 +01:00
cciss.txt
cli-sti-removal.txt
computone.txt
cpqarray.txt
cpu-hotplug.txt [PATCH] cpu hotplug documentation fix 2006-02-20 20:00:10 -08:00
cpusets.txt cpuset two little doc fixes 2006-01-11 02:01:38 +01:00
cputopology.txt [PATCH] Export cpu topology in sysfs 2006-02-03 08:32:09 -08:00
dcdbas.txt
debugging-modules.txt
dell_rbu.txt
devices.txt [PATCH] USB: Delete leftovers from bluetty driver 2005-11-17 11:29:53 -08:00
digiepca.txt
dnotify.txt
dontdiff
eisa.txt
exception.txt
feature-removal-schedule.txt Revert mount/umount uevent removal 2006-02-22 09:39:02 -08:00
floppy.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
ftape.txt
hayes-esp.txt
highuid.txt
hpet.txt Documentation/hpet.txt typo 2006-01-15 02:09:54 +01:00
hrtimers.txt [PATCH] hrtimer: hrtimer documentation 2006-01-10 08:01:37 -08:00
hw_random.txt
ibm-acpi.txt
ide.txt
initrd.txt
io_ordering.txt
ioctl-number.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
iostats.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt [PATCH] Doc/kernel-doc: add more usage info 2006-02-01 08:53:27 -08:00
kernel-docs.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
kernel-parameters.txt [PATCH] x86_64: Add boot option to disable randomized mappings and cleanup 2006-02-17 08:00:40 -08:00
keys-request-key.txt [PATCH] keys: Permit running process to instantiate keys 2006-01-08 20:13:53 -08:00
keys.txt [PATCH] keys: Permit running process to instantiate keys 2006-01-08 20:13:53 -08:00
kobject.txt
kprobes.txt [PATCH] kprobes: Update Documentation/kprobes.txt 2006-02-14 16:09:34 -08:00
kref.txt
laptop-mode.txt spelling: s/appropiate/appropriate/ 2006-01-15 02:00:17 +01:00
ldm.txt
locks.txt [PATCH] Docs update: remove obsolete patch from locks.txt 2006-01-10 08:01:54 -08:00
logo.gif
logo.txt
magic-number.txt
mandatory.txt
mca.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
md.txt [PATCH] md: allow sync-speed to be controlled per-device 2006-01-06 08:34:10 -08:00
memory.txt
mono.txt
moxa-smartio
mtrr.txt
mutex-design.txt [PATCH] mutex subsystem, documentation 2006-01-09 15:59:20 -08:00
nbd.txt
nfsroot.txt
nmi_watchdog.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt [PATCH] doc: refer to kdump in oops-tracing.txt 2006-01-11 18:42:10 -08:00
paride.txt
parport-lowlevel.txt [PATCH] parport: fix documentation 2006-02-03 08:32:06 -08:00
parport.txt
pci-error-recovery.txt [PATCH] Documentation: Updated PCI Error Recovery 2006-02-03 08:32:00 -08:00
pci.txt
pm.txt [ACPI] linux-acpi@vger.kernel.org replaces acpi-devel@lists.sourceforge.net 2006-01-06 16:19:26 -05:00
pnp.txt
preempt-locking.txt
prio_tree.txt
ramdisk.txt
riscom8.txt
rocket.txt
rpc-cache.txt
rtc.txt
sched-arch.txt [PATCH] sched: resched and cpu_idle rework 2005-11-09 07:56:33 -08:00
sched-coding.txt
sched-design.txt
sched-domains.txt
sched-stats.txt
seclvl.txt
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
sharedsubtree.txt
smart-config.txt
smp.txt
sonypi.txt
sparse.txt
specialix.txt
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt [PATCH] Docs update: small fixes to stable_kernel_rules.txt 2006-01-10 08:01:55 -08:00
stallion.txt
svga.txt
sx.txt
sysrq.txt update for Documentation/sysrq.txt 2006-01-03 13:31:01 +01:00
time_interpolators.txt
tipar.txt
tty.txt
unicode.txt
unshare.txt [PATCH] unshare system call -v5: Documentation file 2006-02-07 16:12:34 -08:00
voyager.txt
xterm-linux.xpm
zorro.txt

README.cycladesZ

The Cyclades-Z must have firmware loaded onto the card before it will
operate.  This operation should be performed during system startup,

The firmware, loader program and the latest device driver code are
available from Cyclades at
    ftp://ftp.cyclades.com/pub/cyclades/cyclades-z/linux/