Home / user-63166

JeffG's questions

Martin Hope
JeffG
Asked: 2011-04-02 08:18:35 +0800 CST
  • 2

As part of a server burn-in process, I am running nbench (BYTEmark). The results show two FLOATING-POINT Indexes and two INTEGER Indexes in the results, one under "Original Bytemark" and the other under "Linux data below". Which is the "real" score?

Where are the results with some lines removed for brevity:

TEST                : Iterations/sec.  : Old Index   : New Index
                    :                  : Pentium 90* : AMD K6/233*
--------------------:------------------:-------------:------------
NUMERIC SORT        :          1392.4  :      35.71  :      11.73
STRING SORT         :          175.36  :      78.36  :      12.13
BITFIELD            :      5.6922e+08  :      97.64  :      20.39
FP EMULATION        :          195.48  :      93.80  :      21.64
FOURIER             :           32758  :      37.26  :      20.93
ASSIGNMENT          :          42.053  :     160.02  :      41.50
IDEA                :          7207.4  :     110.23  :      32.73
HUFFMAN             :          2635.8  :      73.09  :      23.34
NEURAL NET          :          50.659  :      81.38  :      34.23
LU DECOMPOSITION    :          1897.4  :      98.30  :      70.98
==========================ORIGINAL BYTEMARK RESULTS==========================
INTEGER INDEX       : 85.367
FLOATING-POINT INDEX: 66.793
Baseline (MSDOS*)   : Pentium* 90, 256 KB L2-cache, Watcom* compiler 10.0
==============================LINUX DATA BELOW===============================
MEMORY INDEX        : 21.734
INTEGER INDEX       : 20.984
FLOATING-POINT INDEX: 37.046
Baseline (LINUX)    : AMD K6/233*, 512 KB L2-cache, gcc 2.7.2.3, libc-5.4.38
linux benchmark
Martin Hope
JeffG
Asked: 2011-03-04 13:34:25 +0800 CST
  • 1

I have a bootable DVD which boots the same Kernel as the Hard Drive (which uses SELinux). I have copied /etc/selinux and all kernel modules to my ramdisk, and have tried various combinations of selinux=1 and selinux 1 with enforcing 1 and enforcing 0. as Kernel boot parameters. All files contained in the checkpolicy, libselinux, policycoreutils, selinux-policy and selinux-policy-targeted rpms have also been copied into the ramdisk tree.

After the system boots from the ramdisk, I check dmesg:

% dmesg | grep -i selinux
Kernel command line: initrd=idrd.img ramdisk_size=110476 selinux=1
SELinux: Initializing.
SELinux: Starting in permissive mode
selinux_register_security: Registering secondary module capability
SElinux: Registering netfilter hooks

But SELinux isn't running:

% /usr/sbin/getenforce
Disabled
% /usr/sbin/setenforce 1
/usr/sbin/setenforce: SELinux is disabled

Neither /var/log/messages nor /proc/kmsg hold clues.

linux selinux
Martin Hope
JeffG
Asked: 2011-02-17 12:11:19 +0800 CST
  • 0

I've been trying to create a bootdisk (something like a live-cd) which loads into memory-only without mounting the disk. My steps are listed below, but when I boot using the cd, I get:

Kernel Panic - not syncing: VFS: unable to mount root fs on unknown-block (9,1)

Here's what I am doing to create the boot disk:

  1. Create a ramdisk using the mkinitrd tool, then decompress:

    mkinitrd myrd $(uname -r)
    mkdir myrdroot && cd myrdroot
    dd if=../myrd bs=1k | gunzip | cpio -id

  2. Git rid of nash, the init (nash script) and modprobe (a symlink to nash)

    rm -f init bin/nash bin/modprobe

  3. Install busybox (Busybox is default config, except it's statically linked). Busybox will create a linuxrc and an sbin/init in myrd.

    pushd ~/busybox
    make CONFIG_ROOT=/path/to/myrd install
    popd

  4. rebundle the inird:

    find . | cpio -n -o | gzip -9 > ../myrd.img

This ramdisk is then used with ISOLINUX on a CD. I copy over the kernel that matches $(uname -r), and configure ISOLINUX to boot the kernel with the ramdisk.

linux ramdisk live-cd