64 bit kernel

Hello.
I've upgraded to Snow Leopard from Leopard a couple of weeks ago, and I've read about the 64 bit kernel boot option, but I can't seem to get it to work (Software section in the *System Profiler* says "_64-bit Kernel and Extensions: No_").
Here is a rundown on the tech info of my mac:
% *Macbook Unibody* (bought at early 2009, before it was changed to be the Macbook pro) - MacBook5,1
% The output of "_ioreg -l -p IODeviceTree | grep firmware-abi_" says its EFI64
% I did an upgrade and not a clean install
% I tried holding down the 6 and 4 keys while booting (before the gray screen appeared) and the System Profiler still showed that it's not a 64 bit kernel
% I changed my /Library/Preferences/SystemConfiguration/com.apple.Boot.plist file to have:
*<key>Kernel Flags</key>*
<string>arch=x86_64</string>
and still no 64 bit kernel according to system profiler.
% I installed all the updates from apple (currently at 10.6.2)
% The Extension section in System Profiler lists the following as NOT 64bit:
$ BSDKernel6.0
$ CHUDKernLib
$ CHUDProf
$ CHUDUtils
$ IOKit6.0
$ Libkern6.0
$ Mach6.0
$ System6.0
So - why is it not booting 64 bit kernel, and how can I fix it/make it boot 64 kernel ?
All the tech info shows it should do it (except maybe for the listed extensions which are not 64bit, but there's not reason that they won't be, if I did a normal upgrade to Snow Leopard, the efi is 64, and other users with the same details can boot 64 bit kernel).
Thank you very much for any help!

welcome to Apple discussions, gshockoman !
check this thread http://discussions.apple.com/thread.jspa?messageID=10741164&#10741164.

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Snow Leopard 64 bit kernel on Mac Pro - Personal Experience.

Curiosity got the better of me so I decided to install Snow Leopard on clean external USB drive (this is a rather slow drive, I believe it is only 4500 RPM), but good enough to test things out.
I formatted the drive before installation in Leopard (HFS+ Journaled, GUID partition), booted off the install DVD and proceeded to install on this external disk. Installation took about 50 min (this is not upgrade but clean install).
After the install was finished, I manually copied over some applications from my Leopard install (together with their application settings and preferences files in ~/Library and /Library). All of them functioned properly.
I am happy to report that Photoshop CS4, Nikon Capture NX 1.3, Sling Player, MacVIm (without ATSUI text renderer), iDefrag, Toast Titanium 9, Transmission etc all worked with no issues.
The color profile for my 30'' ACD screen looked a little too bright and less contrasty (this is gamma 2.2 profile I created for Leopard some time ago), but it is rendered differently in Snow Leopard. Which brings me to another point. My ancient Monaco Optix XR screen calibration software (with USB spectrometer) works with Snow Leopard as well. It does require Rosetta though.
Next thing I tried booting in 64 bit kernel. That worked fine, but now I wanted to add my printers. HP LaserJet 1300 was recognized instantly and added for me, so I guess Apple already provides 64 bit driver for it.
Next is the Epson Stylus Photo R2880. It was recognized (as in type and model) but no driver was available for it. However, Epson has just recently released the driver for it. The question was is it 64 bit as well. As it turns out the installer for the drive requires Rosetta, which wasn't very encouraging, but once installed the driver works just fine with 64 bit kernel. So I guess they do provide 64 bit driver as well.
As a final step I did X bench performance comparison:
This is the result for Snow Leopard
Results 209.29
System Info
Xbench Version 1.3
System Version 10.6 (10A432)
Physical RAM 32768 MB
Model MacPro3,1
Drive Type WD 5000BEV External
CPU Test 199.19
GCD Loop 329.53 17.37 Mops/sec
Floating Point Basic 159.06 3.78 Gflop/sec
vecLib FFT 131.91 4.35 Gflop/sec
Floating Point Library 314.56 54.78 Mops/sec
Thread Test 841.97
Computation 1155.73 23.41 Mops/sec, 4 threads
Lock Contention 662.20 28.49 Mlocks/sec, 4 threads
Memory Test 213.36
System 336.79
Allocate 606.04 2.23 Malloc/sec
Fill 247.60 12038.67 MB/sec
Copy 310.68 6416.90 MB/sec
Stream 156.13
Copy 157.24 3247.78 MB/sec
Scale 157.88 3261.67 MB/sec
Add 155.20 3306.02 MB/sec
Triad 154.28 3300.33 MB/sec
Quartz Graphics Test 216.11
Line 192.80 12.84 Klines/sec [50% alpha]
Rectangle 237.36 70.87 Krects/sec [50% alpha]
Circle 204.41 16.66 Kcircles/sec [50% alpha]
Bezier 229.12 5.78 Kbeziers/sec [50% alpha]
Text 223.22 13.96 Kchars/sec
OpenGL Graphics Test 96.71
Spinning Squares 96.71 122.69 frames/sec
User Interface Test 356.31
Elements 356.31 1.64 Krefresh/sec
And here is the equivalent test for Leopard 10.5.8
Results 252.74
System Info
Xbench Version 1.3
System Version 10.5.8 (9L30)
Physical RAM 32768 MB
Model MacPro3,1
Drive Type WDC WD3200AAJS-41VWA0
CPU Test 190.72
GCD Loop 327.96 17.29 Mops/sec
Floating Point Basic 160.63 3.82 Gflop/sec
vecLib FFT 134.16 4.43 Gflop/sec
Floating Point Library 235.57 41.02 Mops/sec
Thread Test 830.59
Computation 1124.19 22.77 Mops/sec, 4 threads
Lock Contention 658.59 28.33 Mlocks/sec, 4 threads
Memory Test 202.30
System 284.32
Allocate 314.73 1.16 Malloc/sec
Fill 243.49 11838.90 MB/sec
Copy 306.07 6321.67 MB/sec
Stream 157.00
Copy 160.48 3314.67 MB/sec
Scale 157.71 3258.27 MB/sec
Add 155.89 3320.85 MB/sec
Triad 154.07 3296.01 MB/sec
Quartz Graphics Test 243.39
Line 219.20 14.59 Klines/sec [50% alpha]
Rectangle 295.86 88.33 Krects/sec [50% alpha]
Circle 240.56 19.61 Kcircles/sec [50% alpha]
Bezier 235.66 5.94 Kbeziers/sec [50% alpha]
Text 238.06 14.89 Kchars/sec
OpenGL Graphics Test 185.37
Spinning Squares 185.37 235.15 frames/sec
User Interface Test 351.35
Elements 351.35 1.61 Krefresh/sec
As you can see the overall system performance has degraded quite a bit. Snow Leopard performance is only about 82% of Leopard performance.
Close inspection shows that some things are actually faster in Snow Leopard, e.g. CPU has higher score, Thread test has higher score, Memory test is faster. However, quartz test is slower, and Open GL text test is 2 times slower.
This is quite a degradation in performance, and I'm hoping it will be addressed in GPU driver upgrades.
Also, I also noted the dreaded choppy animations, esp for dashboard, which is so choppy it is embarrassing. Like I said, this will probably go away with better driver.
I hope someone else finds this useful.

I plugged the external drive with Snow Leopard (it's set to always boot in 64 bit kernel), and booted up iMac with it. It started fine, but it decided to use 32 bit kernel anyway. This is iMac version 7.1 with 64 bit EFI and 4 GB of RAM. It should technically be possible to boot 64 bit kernel, but doesn't work. I won't even try my Aluminum Macbook .

Issue with binfmt_misc with a 64 bit kernel in 32 bit arch

When i try to upgrade nss-mdns pacman hangs at
(1/1) checking for file conflicts [###############################################] 100%
when i quit i get this
^C
Interrupt signal received
warning: could not get filesystem information for /proc/sys/fs/binfmt_misc: Interrupted system call
(1/1) checking available disk space [###############################################] 100%
Btw i use a 64 linux kernel on arch 32, could be related to that ?
Edit, seems like its related to mixing 64 bit kernel and 32 userspace, qemu hanged too.
Last edited by Maki (2012-02-22 00:06:49)

Ha, i switched to a 64 kernel when i read the message from Linus today, but i didn't read the followups , thanks
Btw, can this topic be moved somewhere else?, its not pacman related and could be helpful to other users.
Last edited by Maki (2012-02-21 20:59:58)

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Can I run 32-bit kernel on OS X Yosemite?

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Does my macbook air boot in 64 bit or 32 bit kernel

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When I boot the macbook air, I hold down 6 and 4 button. After it, when I go to "about this mac", " More Info...", and "software", I find that the item---64 bit Kernel and Extensions: No.
I totally confuse...

I read that MacBooks, including Air's, will not boot 64-bit. Apple has turned that ability off in the OS. Why? One can only speculate.
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Would apprecite any stories regarding success/failure.

I've tried and have not found a sucessful combination. I tried the JDK bundled
with 6.1sp2 as well as 1.3.1.10 and 1.3.1.11
sorry no help,
James
[email protected] (Len) wrote:
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will run in the respective kernel modes, however, has anyone tried
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Lot's of posts on this and lots of hits if you did a forum search...
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Hi,
To find out wheter 32 or 63-bit mode
# /usr/bin/isainfo -kv
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32-bit mode
# eeprom boot-file=kernel/unix
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# eeprom boot-file=kernel/sparcv9/unix
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boot kernel/sparcv9/unix
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Mac Pro Classic, Snow Leopard, and 64 bit kernel

Hello, and thanks in advance for your thoughts and your help. A question was brought up on the macrumors forums about the shortcomings of the 2006 mac pro. Basically someone said that he would not get a used 2006 mac pro because "it can't boot into Leopard in 64-bit." I asked him what he meant and he said that he didn't think it was "true" 64 bit because in his system info it says "64 bit kernel and extensions - no". I poked around a little bit and found a good article:
http://www.appleinsider.com/articles/08/10/28/roadto_mac_os_x_snow_leopard_64_bit_to_thekernel.html
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Now, my question. Since my Mac Pro runs on 32 bit EFI instead of the new EFI 64, will I be able to have a similar 64 bit Snow Leopard experience? Will my EFI on my antique mac pro really limit the 64 bit Snow Leopard experience? Will my aluminum macbook be able to "do" more with snow leopard than my mac pro? and lastly, I am currently running the Radeon 4870 in my mac pro, since the guys at ATI snuck the 32 bit EFI onto the card as well as the 64 bit EFI, somehow. I wonder what's going to happen with all this when Snow Leopard drops.

I think part of the confusion is that the original Mac Pro does not enable 64 bit under Boot Camp. If you look at:
http://www.everymac.com/systems/apple/mac_pro/stats/mac-pro-quad-2.66-specs.html
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From the above link:
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I would not rely on AppleInsider as a resource. It is a rumor site.

[solved] Can't connect to network with 64-bit kernel

On 64-bit Arch Linux, I can't get any network access. On 32-bit Arch Linux, I can connect to my router with an ethernet cable or a wireless card using dhcpcd or networkmanager.
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- Getting networkmanager-git from AUR
- Using the r8168 driver for my ethernet card (which is actually exactly the same one as the one from https://wiki.archlinux.org/index.php/Co … k_messages )
But I haven't been able to get "dhcpcd eth0" to tell me anything but
dhcpcd[677]: eth0: sending IPv6 Router Solicitation
dhcpcd[677]: eth0: broadcasting for a lease
dhcpcd[677]: eth0: sending IPv6 Router Solicitation
dhcpcd[677]: eth0: sending IPv6 Router Solicitation
dhcpcd[677]: eth0: sending IPv6 Router Solicitation
dhcpcd[677]: eth0: no IPv6 Routers available
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eth0: no IPv6 routers present
eth0: no IPv6 routers present
eth0: no IPv6 routers present
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interface=eth0
address=
netmask=
broadcast=
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I can get whatever 64-bit packages I need to get the internet to work in 64-bit linux by downloading them in 32-bit linux and then upgrading to 64-bit linux.
My goal is to get networking to work on 64-bit linux through either eth0 or wlan0 (eventually I'll need wlan0 but right now neither works, so if one starts working, the other probably will), or for someone to say "It's impossible dude, go download opensuse and see if you get a different damning error over there".
Happy trails,
jc
Last edited by jc (2012-06-13 23:21:31)

ewaller wrote:Are you doing this on the same computer with different kernels?
Yep.
Are you sharing /etc between the 32 and 64 bit kernels?
Yes. Networking doesn't work on the 64-bit install disk either though, which obviously doesn't share its /etc with anything.
Can you post your 64 bit system's /etc/dhcpcd.conf file?
hostname
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
option ntp_servers
option interface_mtu
require dhcp_server_identifier
nohook lookup-hostname
noipv4ll
On your 64 bit system, what is the output of ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 14:da:e9:0f:69:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::16da:e9ff:fe0f:6985/64 scope link
valid_lft forever preferred_lft forever
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether e0:69:95:d3:7e:e9 brd ff:ff:ff:ff:ff:ff
What is the version of your 32 bit kernel?
3.3.8
Have you tried dhclient instead of dhcpcd ?
I have. No cake.

64 bit kernel cabable iMac won't boot in 64 bit kernel when prompted in Mountain Lion.

Hey guys. I am using a 24" iMac from the March 2009 line. I am aware that this Mac is capable of running in 64 bit kernel mode, but the default is 32. When Snow Leopard hit, I was able to boot in 64bit mode with the appropriate prompt in the terminal and also via the 6 and 4 keys at startup. I could also verify this in the system profiler under software.
In mountain Lion, this porion of the profil is missing under software and I am unable to verify that it is running in 64 bit kernel. I used a 3rd party app to determine the kernel and it still says that I am runnin in 32bit kernel. Now either I am, by default running 64bit and the ap is wrong, or there is something that I am missing here. I am attaching a photo of the app I used. Thanks for any help any of you may provide.

I'd doubt the 3rd party App.
There is no 32 bit kernel in Mountain Lion.
You can check in Activity Monitor.

32 bit Kernel Panic upon upgrade, 64 bit Kernel boots fine.

Greetings,
I just did a regular update from 10.5 to 10.6, and upon completion of the upgrade I can't boot into the 32 bit Kernel without a Kernel Panic. I can freely boot into the 64 bit kernel, and it works fine. Anyone else experience this? I could do a full re-install, but before I go through all that shenanignas I would just like to see if anyone might have some advice for me.
Thanks!
David

Have you tried both ways: booting normally and booting holding down 3-2?

I cannot get my Mac Pro (Original) MacPro1,1 to boot with the 64 Bit kernel in 10.6.8

I cannot get my Mac Pro (Original) MacPro1,1 to boot with the 64 Bit kernel in 10.6.8 (this is a 2 x 3Dual-Core Intel Xeon machine).
Firmware = MP11.005C.B08 (EFI 1.2) 1.7f10 (SMC 1.1)
Will it not run the 64 bit kernel?
Is there a firmware upgrade to allow this?
Should I bother?
It won't boot with the Key 6 & 4 method.
or using Terminal command;
sudo systemsetup -setkernelbootarchitecture x86_64
Any suggestions?
Thanks in advance...
Eric

Because it can't and doesn't have a 64-bit supported firmware.
UEFI (EFI64) was not finalized and adopted until very late 2007 and introduced in 2008, by Apple, Intel, other members of EFI Group and Unified EFI. The Mac Pro Mid-2010 was the first time though that 64-bit mode was the default.
Does it matter? not really. you can't install 48GB RAM anyway, while there are some improvements from 64-bit kernal.
Also can't boot Windows 7 64-bit DVD to install properly. But you can run Windows 64-bit kernel because you have a 64-bit Xeon.
Macs that use 64-bit kernel
64-bit kernel mode Snow Leopard
Booting with 32-bit or 64-bit kernel
Mac OS X- 64-bit kernel questions
http://macperformanceguide.com/SnowLeopard-64bit.html

Can Mac mini boot into 64-bit kernel

http://macperformanceguide.com/SnowLeopard-64bit.html says:
To determine if your Mac has 32-bit or 64-bit firmware, copy/paste the following command into Terminal:
ioreg -l -p IODeviceTree | grep firmware-abi
...output:
| | "firmware-abi" = <EFI64>
As shown above, the firmware-abi has the value EFI64, indicating that my Mac Pro is 64-bit capable. If it reads EFI32, then your Mac cannot be booted into a 64-bit kernel.
...well, my Mac mini displays that EFI64 64-bit info, but when booting with the "64" keys down it nevertheless uses the 32-bit kernel.
So can the Mac mini boot into 64-bit kernel?

What you are missing is that Apple has written into the boot ROM for certain Macs which meet the criteria to not be able to boot with the 64-bit kernel. The Mac mini is not allowed to boot into 64-bit mode by Apple. There is a list of non-pro Macs hard coded into the EFI boot firmware that tells it not to allow these Macs to boot into 64-bit mode. The Mac mini is on the list! Try as you may the Mac mini will not do it without a hack.
If you google this issue you can find a hack to rewrite the boot firmware and allow the mini to boot into 64-bit mode. It can be dangerous to your mini if you make a mistake!
Here is one hack;
http://www.osxbook.com/blog/2009/08/31/is-your-machine-good-enough-for-snow-leop ard-k64/
Dah•veed

64 bit kernel

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