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<title type="html">Tech</title>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog"/>
<link rel="self" type="application/atom+xml" href="http://fortytwo.ch/blog/archives/cat_7/index-atom.xml"/>
<updated>2008-09-19T16:19:30+02:00</updated>
<author>
<name>cmot</name>
<uri>http://fortytwo.ch/blog</uri>
</author>
<id>http://fortytwo.ch/blog/</id>
<generator uri="http://nanoblogger.sourceforge.net" version="3.3 RC5">
NanoBlogger
</generator>

<entry>
<title type="html">Moving</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/09/#e2008-09-19T16_19_27.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/09/#e2008-09-19T16_19_27.txt</id>
<published>2008-09-19T16:19:27+02:00</published>
<updated>2008-09-19T16:19:27+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>Readers of my blog will want to update their URLs.  As of right now, I've
moved my blog to <a
href="http://blog.fortytwo.ch/">http://blog.fortytwo.ch/</a>.</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">HAL, D-Bus, udev, DeviceKit, Gstreamer, Phonon, Solid, Nepomuk, Sydney...</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/09/#e2008-09-19T10_55_13.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/09/#e2008-09-19T10_55_13.txt</id>
<published>2008-09-19T10:55:13+02:00</published>
<updated>2008-09-19T10:55:13+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>Reading <a href="http://lwn.net/">LWN</a>'s coverage of the <a
href="http://linuxplumbersconf.org/">Linux Plumbers Converence</a>, it occured
to me that while I as somewhat experienced Linux user may know many of the
components of a modern Linux desktop system, technically interested but less
experienced users may have no idea what goes where.  So <a
href="http://fortytwo.ch/linuxplumbing">here</a> is a very rough high-level
introduction to the &ldquo;under the hood&rdquo; components I could think of.
As you can see there are many gaps in my knowledge, too...</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">25 pair telco cable color scheme</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/09/#e2008-09-12T11_34_26.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/09/#e2008-09-12T11_34_26.txt</id>
<published>2008-09-12T11:34:26+02:00</published>
<updated>2008-09-12T11:34:26+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>I had to rewire a DSL concentrator (thunderstorm blew one of the ports...)
today.  The concentrator has two fan-out cables (input, output) with 25 RJ-11
connectors, color coded, so I had to find the colors of the remaining
non-defective ports (there are 12 ports on this concentrator, the other 13
pairs are not connected.  Presumably there isn't a 12 pair cable.)  Google
shows tons of references to the apparently standard <a
href="http://en.wikipedia.org/wiki/25-pair_color_code">25 pair color code</a>
(first pair is white/blue), but unfortunately &ldquo;my&rdquo; cable had a
light blue/light yellow first pair with most other pairs made up of cables with
a base color and a colored stripe.  I couldn't find the color chart on the
Internet.</p>

<p>Finally, the strange thought of RTFM entered my mind (and I even found the
manual of the concentrator), and found that the importer has added a color
chart leaflet to it; the cable is referred to as a &ldquo;Telco50&rdquo; cable.
So here we go:</p>

<table>
<tr><th>Pair</th><th>First Wire</th><th>Second Wire</th></tr>
<tr><td>1</td><td>red</td><td>red &mdash; white</td></tr>
<tr><td>2</td><td>yellow</td><td>yellow &mdash; black</td></tr>
<tr><td>3</td><td>green</td><td>green &mdash; white</td></tr>
<tr><td>4</td><td>blue</td><td>blue &mdash; white</td></tr>
<tr><td>5</td><td>brown</td><td>brown &mdash; white</td></tr>
<tr><td>6</td><td>black</td><td>black &mdash; white</td></tr>
<tr><td>7</td><td>purple</td><td>purple &mdash; white</td></tr>
<tr><td>8</td><td>orange</td><td>orange &mdash; white</td></tr>
<tr><td>9</td><td>light green</td><td>green &mdash; black</td></tr>
<tr><td>10</td><td>blue &mdash; black</td><td>purple &mdash; black</td></tr>
<tr><td>11</td><td>light blue &mdash; black</td><td>light blue &mdash; red</td></tr>
<tr><td>12</td><td>light green &mdash; green</td><td>light green &mdash; blue</td></tr>
<tr><td>13</td><td>light green &mdash; black</td><td>light green &mdash; red</td></tr>
<tr><td>14</td><td>light blue &mdash; blue</td><td>light blue &mdash; green</td></tr>
<tr><td>15</td><td>light yellow &mdash; red</td><td>light yellow &mdash; black</td></tr>
<tr><td>16</td><td>light yellow &mdash; green</td><td>light yellow &mdash; blue</td></tr>
<tr><td>17</td><td>gray</td><td>gray &mdash; black</td></tr>
<tr><td>18</td><td>gray &mdash; green</td><td>gray &mdash; red</td></tr>
<tr><td>19</td><td>red &mdash; black</td><td>light red</td></tr>
<tr><td>20</td><td>light red &mdash; blue</td><td>light red &mdash; green</td></tr>
<tr><td>21</td><td>light red &mdash; black</td><td>light red &mdash; red</td></tr>
<tr><td>12</td><td>white</td><td>orange &mdash; black</td></tr>
<tr><td>13</td><td>white &mdash; blue</td><td>white &mdash; green</td></tr>
<tr><td>24</td><td>white &mdash; red</td><td>white &mdash; black</td></tr>
<tr><td>25</td><td>light blue</td><td>light yellow</td></tr>
</table>

<p>(Actually, on the DSL concentrator here this order is listed as
&ldquo;pin&rdquo; numbers while the 12 ports are assigned in reverse order,
starting at 25.  The concentrator is a Zyxel VES-1012 and is not in production
anymore.)</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">KDE 4.1</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/07/#e2008-07-29T15_48_01.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/07/#e2008-07-29T15_48_01.txt</id>
<published>2008-07-29T15:48:01+02:00</published>
<updated>2008-07-29T15:48:01+02:00</updated>
<category term="Debian" />
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>A while ago I decided that my desktop computer would be a test platform for
a few things.  So at the moment it's <a href="http://www.kde.org/">KDE</a> 4.1
and <a href="http://openoffice.org">OpenOffice.org</a> 3.0 beta, both from <a
href="http://debian.org/">Debian</a>'s experimental distribution.  Which, on a
system which originally was an installation of Debian etch, means that by now
not much is left over from that etch system.  Long live Debian's dependency
handling, which so far has never really let me down!  Conclusion: thankfully I
have a laptop for actually doing stuff...</p>

<ul>
<li><a href="http://www.digikam.org/">Digikam</a> (the KDE 4 version as
packaged in experimental) is <a href="http://bugs.debian.org/491458">completely
b0rked</a>, which is the most annoying thing because the machine is my main
photo storage.  (I don't do anything beyond archiving the photos, so just
blowing away the digikam database is no issue, as is just putting the files
into the filesystem.  OTOH once Digikam's new removable-media support is tested
and works, I plan to start annotating the pictures.)</li>
<li><a href="http://kontact.kde.org/kmail/">Kmail</a>, absolutely wants to
display emails in a proportional font.  And I'm <em>not</em> going to configure
a typewriter font as the default &ldquo;proportional&rdquo; system font...
Also, but I suspect that might be an issue with the IMAP server, it still
forgets the &ldquo;ignored&rdquo; state of mailing list threads. making any
moderatly high traffic list impossible to read.</li>
<li>OpenOffice.org runs for about 30 seconds before crashing.  Ok, it's beta,
but so far my experience with packaged stuff, even in experimental, was better.
Still, I'm not complaining, I'll just wait for the next version.</li>
<li>KDE 4 can't cope with multiple screens (at least if they don't have the
same size.)  KDE 3 was just nice on this system.  I'll start filing bugs when
KDE has stabilised enough.  If I still have that graphics subsystem then
&mdash; I've been considering upgrading to a bigger screen for a while now,
which probably would mean that I'd throw away the second display, getting more
desk space instead.</li>
</ul>

<p>I should probably add that this is not a rant.  I'm running software that's
explicitly labelled as experimental.  So people should probably view this as a
response to whoever (can't find it anymore, wasn't it on Planet?) recently
stated that he'd switch to the Hurd since Debian has become boring.  Or as a
Thank You posting for those making Debian from a &ldquo;you know it's been the
stable version for the last year when it's entered Debian&rdquo; type of
distribution into a &ldquo;get it on the day of release&rdquo;
distribution.</p> ]]>
</div>
</content>

</entry>
<entry>
<title type="html">Mediawiki</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/07/#e2008-07-23T14_43_56.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/07/#e2008-07-23T14_43_56.txt</id>
<published>2008-07-23T14:43:56+02:00</published>
<updated>2008-07-23T14:43:56+02:00</updated>
<category term="Debian" />
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p><a href="http://www.postgresql.org/">PostgreSQL</a> upgrade from 8.2 to 8.3.
<a href="">This</a> really should be automated (... but I guess I understand
why it's not.) At least it does work as advertised, thanks a lot to Julien
Danjou.  And thanks to Martin Pitt and the PostgreSQL developers for making it
so painless to run several PostgreSQL versions side by side.  Now there's a
serious database.</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">tech-faq.com</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/07/#e2008-07-10T11_06_05.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/07/#e2008-07-10T11_06_05.txt</id>
<published>2008-07-10T11:06:05+02:00</published>
<updated>2008-07-10T11:06:05+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>Who or what is tech-faq.com?  I just found out that they listed my server,
without asking, on their list of public DNS servers.  There also is no obivous
way to contact them.</p>

<p>(The fact that zbasel.fortytwo.ch <i>was</i>indeed a public DNS server was
my own configuration mistake, of course, not theirs...)</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">Sometimes providers do get better...</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/06/#e2008-06-25T08_17_20.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/06/#e2008-06-25T08_17_20.txt</id>
<published>2008-06-25T08:17:20+02:00</published>
<updated>2008-06-25T08:17:20+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p><a
href="http://www.perrier.eu.org/weblog/2008/06/23#do-you-really-want-to-communicate">Christian</a>,
I used to block quite aggressively (essentially blocking all IPs sending me
spam for a few months) and remember seeing free.fr very, very often.
Apparently this was before the block outgoing port 25 policy &mdash; I just had
a grep through my log and see almost no spam coming in from free.fr.  So, <a
href="http://fortytwo.ch/blog/archives/2008/06/#e2008-06-06T09_13_11.txt">as
I've said just recently</a>, this is a note to all ISP: please, please, please
block port 25!  (ISP who don't offer unblocking will obviously lose the techie
clients, but that's their own thing to decide...)</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">Blocking outgoing port 25</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/06/#e2008-06-06T09_13_11.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/06/#e2008-06-06T09_13_11.txt</id>
<published>2008-06-06T09:13:11+02:00</published>
<updated>2008-06-06T09:13:11+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>For once, the <a
href="http://dirk.eddelbuettel.com/blog/2008/06/05#comcast_blocks_port_25">the
action of an otherwise stupid ISP</a>, namely blocking port 25 outgoing, was
probably the right thing to do.  Yes, in comcasts case, it apparently was
communicated badly, and of course you have to be able to get it unblocked
easily, but I think if all big providers would either block 25 outgoing
alltogether for their consumer offerings or would block it for hosts they see
spamming (pattern: smtp connections to more than 20 hosts within one minute
perhaps?) the world would be a better place.</p>

<p>OTOH spammers are already reacting: the percentage of spam I'm receiving
through regular MXen (as per reverse DNS), including Yahoo and Google, (but not
gmx so far, interestingly) is increasing markedly these months.</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">Mixers</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/05/#e2008-05-29T07_37_07.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/05/#e2008-05-29T07_37_07.txt</id>
<published>2008-05-29T07:37:07+02:00</published>
<updated>2008-05-29T07:37:07+02:00</updated>
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>Adeodato Simó <a
href="http://chistera.yi.org/~adeodato/blog/entries/2008/05/28/too_many_mixers.html">complains</a>
about the many ways to regulate sound volume on his system.  I can only add
that on my Dell Inspiron 9300, the &ldquo;Master&rdquo; is actually not usable
because it is mapped only to the tiny stereo speakers while leaving the
subwoofer alone, which is mapped to &ldquo;Master Mono&rdquo;.  So I have to
use the pcm mixer.</p>

<p>At least I can map the buttons (both Fn+keyboard key and the additional
buttons at the front of the laptop) to the pcm mixer.  But it took quite some
fiddling for something the non-technical user will expect work out of the
box.</p>]]>
</div>
</content>

</entry>
<entry>
<title type="html">Filesystems in Linux</title>
<author>
<name>cmot</name>
</author>
<link rel="alternate" type="text/html" href="http://fortytwo.ch/blog/archives/2008/04/#e2008-04-30T10_54_24.txt"/>
<id>http://fortytwo.ch/blog/archives/2008/04/#e2008-04-30T10_54_24.txt</id>
<published>2008-04-30T10:54:24+02:00</published>
<updated>2008-04-30T10:54:24+02:00</updated>
<category term="Free Software" />
<category term="Tech" />
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
                                                <![CDATA[
<p>With Hans Reiser <a
href="http://blog.wired.com/27bstroke6/2008/04/reiser-juror-de.html">convicted
for murder</a>, some seem to feel that reiserfs is more or less dead.  <a
href="http://blogs.zdnet.com/BTL/?p=8647">Jason Perlow</a> writes a very
strange article on ZDNet to which I'm replying to it mainly because he alludes
that Debian so far has failed to react.</p>

<p>First, default installations of Debian create ext3 and not reiserfs
filesystems (Please correct me if I'm wrong.  I've just recently installed a
fresh etch, but I didn't specifically look at the fs.)  And even if it were
reiserfs (v3), I don't see why a reaction would be called for now.  The
stability of reiserfs has come up every once, before the whole murderer story
begun, and that the interaction between the reiserfs developers (including, of
course, Hans Reiser) and the kernel team were always difficult has also been
known for a long time.  This is the kind of reason where I think it's
appropriate for Debian to take steps (i.e. switching to a different
filesystem), not a single event, where it is not even clear yet how the
reiserfs (v3 and v4) efforts will move on.</p>

<p>On to the technical stuff:  Perlow tries, but doesn't really arrive at
understanding the issues he's writing about.  Reiser 4 is discounted without a
single remark on its technical merits (I can't comment either as I have not
looked at it so far.)  Why he discounts ext4 is not clear to me (because it is
not ripe for production use yet &mdash; but that's even more true of ZFS and
this Linux-NTFS thingy he rambles about further down...)  He discounts JFS2
because it hasn't got a new release for several years (is that bad in a
filesystem?) but then touts ZFS as a great idea with minor licensing problems,
without speaking of patents <a href="http://kerneltrap.org/node/8066">which is
where the real problems lie</a> (not to mention the fact that the Linux ZFS
port probably is much less tested than ext4 or JFS.)  And in a final jump
into fantasy-land he mentions that NTFS might just be ideal for Linux, and
Microsoft is said to have started cooperating nicely with the Free Software
world, so all licensing and patent issues are certainly going away Real Soon
Now&trade;.  At least for Novell, these issues shouldn't be a problem, I
guess.</p>

<p>Not mentioned by Jason are <a
href="http://oss.oracle.com/projects/btrfs/">btrfs</a> (which has a quite
tightly coupled network filesystem brother, <a
href="http://oss.oracle.com/projects/crfs/">crfs</a> and is in a very early
state of development), and <a
href="http://kerneltrap.org/DragonFlyBSD/HAMMER_Filesystem_Design">hammer</a>,
which comes from the BSD world and currently lacks a Linux port.  Both efforts
are probably more likely to replace ext3 or reiser on Linux than both ZFS and
NTFS: no patent issues, no license issues, and the development is actually done
by a community and not a single company.</p>

<p><b>Update:</b> Julien Blanche ha a much more succinct <a
href="http://blog.technologeek.org/2008/04/30/104">response to Jason
Perlow</a>.  More intersting to read than mine, too.</p>]]>
</div>
</content>

</entry>

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