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15%
Get the best out of your bandwidth with tc
30.11.2025
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»
Archive
»
2012
»
Issue 10: Traff...
»
is as follows: tc filter add dev $DEV protocol ip parent 1:
0
prio 100 u32 match ip $DIR
12
.34.56.78 flowid 1:
12
You'll be glad to know the filter's config is much simpler than the classes or the qdisc
15%
A Btrfs field test and workshop
31.10.2025
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»
Archive
»
2012
»
Issue 11: Cloud...
»
, you can use the current package from Debian Sid [4], which is available there as version
0
.19+20120328. After meeting these preconditions, you can start with a fresh Ubuntu
12
.04 LTS server default
15%
An IT nomad's daily diary
30.11.2025
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»
Archive
»
2011
»
Issue 6: Perfor...
»
\ 02 --hostname=foo.bar.de --mac- address=
00
:40:26:CA:10:DD \ 03 --kopts="stage=test app=www" --ksmeta="stage=test app=www" 04 # cobbler system edit --name=foo --interface=eth
0
--mac=
00
:40:26:CA
14%
Tracing applications with OProfile and SystemTap
30.11.2025
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»
Archive
»
2010
»
Issue 1: System...
»
686 oprofile-
0
.9.5-4.fc
12
.i686 To profile the kernel, you need to tell OProfile where the kernel image is located with the --vmlinux option: opcontrol --setup --vmlinux=/usr/lib/debug/lib/ modules
14%
Beyond monitoring: Mathematical load simulation in Perl
30.11.2025
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»
Archive
»
2011
»
Issue 6: Perfor...
»
Model"; 11 $work = "ebiz-tx";
12
$node1 = "WebServer"; 13 $node2 = "AppServer"; 14 $node3 = "DBMServer"; 15 $think =
0.0
* 1e-3; # as per test system 16 $dtime = 2.2 * 1e-3; # dummy service time 17 18
14%
One metric to rule them all
31.10.2025
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Archive
»
2012
»
Issue 11: Cloud...
»
at the output of uptime [1] on OS X: 13:03 up 2 days,
12
:01, 2 users, load averages:
0
.52
0
.59
0
.63 The uptime command displays the load average in its common form, averaging the last one, five, and 15 minutes
14%
I/O benchmarks with Fio
30.11.2025
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»
Archive
»
2011
»
Issue 5: Pen Te...
»
/
0
K /
s
] [4137 /
0
iops] [eta
00
m:06
s
] In the example, the first job is performing a sequential read, marked as r in square brackets, while Fio hasn't initialized the second job, marked as P
14%
Managing virtual machines
30.11.2025
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»
Archive
»
2012
»
Issue 09: Windo...
»
/sysconfig/network-scripts/ifcfg-eth
0
-e "
s
/
/
/" You need a similar approach with the Udev rules mentioned earlier. In this way, you can also replace the hostname so that it matches the name assigned during
14%
Debugging the Linux kernel with the Qemu emulator
30.11.2025
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»
Archive
»
2012
»
Issue 07: Xen v...
»
. The following command tells the system the hex address of the code segment and the two data segments: add-symbol-file path/hello.ko
0
xd8817000 -
s
.data
0
xd88170e
0
-
s
.bss
0
xd8817294 Now you can set a breakpoint
14%
Workshop: Container virtualization with LXC on Ubuntu 10.04
30.11.2025
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»
Archive
»
2011
»
Issue 6: Perfor...
»
.network.type = veth 04 lxc.network.flags = up 05 lxc.network.link = br
0
06 lxc.network.hwaddr = 08:
00:12
:34:56:78 07 #lxc.network.ipv4 =
0.0.0.0
08 lxc.network.ipv4 = 192.168.1.69 09 lxc.network.name = eth
0
10 lxc
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