option DUMMY_NOPS # speed hack; recommended

option DUMMY_NOPS # speed hack; recommended

Post by Berk S. Daemo » Sat, 13 Apr 2002 11:46:19



Anyone able to explain maybe roughly what DUMMY_NOPS is for?

#option         DUMMY_NOPS      # speed hack; recommended

From the comment it says speed hack; recommended. But if it's recommended,
why is it disabled by default?

Just curious about this...

TIA!

Regards.

 
 
 

option DUMMY_NOPS # speed hack; recommended

Post by Ted » Sat, 13 Apr 2002 12:25:14



> Anyone able to explain maybe roughly what DUMMY_NOPS is for?

> #option         DUMMY_NOPS      # speed hack; recommended

It makes some assembly sequences faster by leaving out the NOPs.  These
are sometimes needed to slow things down, but most CPUs get along without
them now.

Quote:> From the comment it says speed hack; recommended. But if it's recommended,
> why is it disabled by default?

Some computers need NOPs and bad things happen when they are missing.
GENERIC has to support as many systems as possible.

--
If you ever would give them a helping hand,
You can be sure they'll chop off the arm.
Never, ever, never trust a Klingon; you will always regret it.

 
 
 

option DUMMY_NOPS # speed hack; recommended

Post by Berk S. Daemo » Sat, 13 Apr 2002 13:18:19




> > Anyone able to explain maybe roughly what DUMMY_NOPS is for?

> > #option         DUMMY_NOPS      # speed hack; recommended

> It makes some assembly sequences faster by leaving out the NOPs.  These
> are sometimes needed to slow things down, but most CPUs get along without
> them now.

> > From the comment it says speed hack; recommended. But if it's
recommended,
> > why is it disabled by default?

> Some computers need NOPs and bad things happen when they are missing.
> GENERIC has to support as many systems as possible.

ahhhhh.... Thx dude.
 
 
 

1. Applying latest Recommended/Security patches installs grub, but "Solaris failsafe" grub option is missing.

Hello Guys,

After applying in single user mode the following patches on a Sun
W1100z workstation running Solaris 10 x86/64 03/05,

118344-08-SunOS 5.10_x86: Fault Manager Patch
118966-19-X11 6.8.0_x86: Xorg patch
119060-12-X11 6.6.2_x86: Xsun patch
119116-17-Mozilla 1.7_x86 patch
119549-04-GNOME 2.6.0_x86: Gnome Multi-protocol instant messaging
client Pat
119901-02-GNOME 2.6.0_x86: Gnome libtiff - library for reading and
writing T
122035-01-SunOS 5.10_x86: nawk patch
122857-02-SunOS 5.10_x86: sendmail patch
118372-07-SunOS 5.10_x86: elfsign Patch
118855-02-SunOS 5.10_x86: kernel patch
118919-12-SunOS 5.10_x86: Solaris Crypto Framework patch
119131-19-SunOS 5.10_x86: Sun Fibre Channel Device Drivers
120901-03-SunOS 5.10_x86: libzonecfg patch
121334-02-SunOS 5.10_x86: zoneadmd, zlogin and zoneadm patch
119255-19-SunOS 5.10_x86: Install and Patch Utilities Patch
120255-02-SunOS 5.10_x86: ufs Patch
122033-02-SunOS 5.10_x86: Update timezones patch

I rebooted the system and it came up with a "panic: cannot mount boot
archive".
Googling around, I kind of found out how to get around this, which is:

I booted from cdrom 1 of Solaris 10 x86 (01/06) and ran the following:
# mount /dev/dsk/c0d0s0 /a
# bootadm update-archive -f -R /a

Now the W1100z boots up fine, but still, comparing the grub menu
options on the W1100z (natively 03/05) to another one (32 bit,
unfortunately) which I have installed from scratch with the 01/06
media, there is no "Solaris failsafe" boot option.

On the 32bit 01/06 box, I can see the following in /boot/grub/menu.lst
#---------- ADDED BY BOOTADM - DO NOT EDIT ----------
title Solaris failsafe
root (hd0,0,a)
kernel /boot/multiboot kernel/unix -s
module /boot/x86.miniroot-safe
#---------------------END BOOTADM--------------------
With /boot/multiboot and /boot/x86.miniroot-safe existing under /boot.

But, these files are not present on the 64 bit W1100z.

Any idea about how to get this sorted?

Thanks in advance

Loris

2. dell latitude c600 whines only under linux

3. Is the new KDE affected by Leon Bottou's speed hack?

4. Package gripes?

5. Getting CONNECT speed from dctrl- chat hack works!

6. Setting up networking, Linux+Win98

7. Recommended windowmanager for speed and features ?

8. How to create more then 8 slices on a disk

9. Speed..Speed..Speed

10. Linux - how to burst ADSL speed by kernel option

11. Speed improvement between different cache options ?

12. Maximal file size and file system speed, options ?

13. newfs disk speed option