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Debian, multiarch and installing 32-bit libraries on x86-64
by Jason White 12 Jan '12

12 Jan '12

I'm running Debian Sid (reasonably up to date). To run a particular 32-bit executable on my x86-64 machine, it appears that I need a 32-bit x86 version of libz.so. The error message from the executable is: error while loading shared libraries: libz.so.1: wrong ELF class: ELFCLASS 64 Given what is happening with Debian multiarch, which is supposed to solve this problem, what's the correct way to install the library at the moment?

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XFS and fstrim
by Craig Sanders 07 Jan '12

07 Jan '12

Does anyone use fstrim on an XFS formatted SSD partition? I've got two systems with XFS root partitions that fstrim seems to do (almost) nothing on, but it seems to work correctly on another system with formatted with ext4. Details follow: System 1 is an AMD 1090T with a Patriot Torqx 2 128GB SSD. System 2 is also an AMD 1090T with a Patriot Pyro 120GB SSD. I've been running both for several months without any TRIM support because I (incorrectly) assumed that XFS' support for TRIM was automatically enabled. I've recently discovered that it's not, and also that it's better performance-wise to run fstrim regularly from cron for 'batch-mode' TRIM operations. Anyway, System 1 takes over 7 minutes to run fstrim, and claims to have trimmed about 16GB....but if i run it again it still takes over 7 minutes and claims to have trimmed about the same amount of data (slightly less). # time fstrim -v / /: 16777764864 bytes were trimmed real 7m31.089s user 0m0.004s sys 0m9.705s # time fstrim -v / /: 16772276224 bytes were trimmed real 7m8.973s user 0m0.000s sys 0m9.165s System 2 takes over 28 minutes to run fstrim and claims to trim about 51GB of data (it's had an SSD for a lot longer than System 1. It also has /home on /, whereas System 1 has /home on a separate disk). similarly, running it again immediately afterwards also takes about the same amount of time and claims to trim about the same amount of data. # time fstrim -v / /: 51594948608 bytes were trimmed real 28m19.832s user 0m0.000s sys 0m6.264s # time fstrim -v / /: 51499814912 bytes were trimmed real 28m29.230s user 0m0.000s sys 0m6.328s (interestingly, the Pyro is a *much* faster SSD than the Torqx2. it's SATA3 and is capable of about 500-550MB/s. The Torqx 2 is SATA 2 and is capable of about 230MB/s...seems as if TRIM speed is roughly the same for both drives, proportional to the amount of data to be trimmed. almost certainly limited by the flash speed with the internal controller differences being negligible for this task) OK, so it seems as if fstrim claims X bytes were trimmed, but it doesn't actually happen. On a third system, I have / on an SSD formatted with ext4. System 3 is an Intel Xeon E5607, and the SSD is an OCZ AGILITY3 120GB. # time fstrim -v / /: 14267424768 bytes were trimmed real 2m25.222s user 0m0.000s sys 0m0.636s # time fstrim -v / /: 0 bytes were trimmed real 0m0.001s user 0m0.000s sys 0m0.000s on ext4 fstrim seems to work as expected. The OCZ SSD is also a LOT faster than the Patriot SSDs (roughly 14GB trimmed in 2.5 minutes). anyone seen this before? is it a bug in XFS' SSD handling? or am i just misinterpreting the results? my google-fu can't find anyone with similar problems, just mailing list articles and an XFS wiki page saying that it works, and that running fstrim regularly is recommended over using the 'discard' mount time option. craig PS: i was already thinking of reformatting these SSDs with ext4 anyway. They're mostly used as boot & OS drives, with bulk storage on a ZFS volume so don't need XFS. gives me a good excuse to replace the Torqx2 with a Pyro :) (and the Torqx2 can go into my mythtv box where it'll speed up the mythtv mysql database). -- craig sanders <cas(a)taz.net.au>

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searching for $@
by Russell Coker 06 Jan '12

06 Jan '12

When hacking some Perl code I encountered $@. It seems that is just a way of dumping the last error. Unfortunately Google doesn't help me because it only does a word based search. Does anyone know of a search engine that allows searching for such things? Also what's the best web site for finding a quick summary of what something does in Perl? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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bad adsl connection
by James Harper 05 Jan '12

05 Jan '12

Monitoring of a remote router is reporting rtt of 1000 ms (sometimes up to 3000) and packet loss of 30-60%. If the rtt was higher I'd be expecting some sort of malicious activity going on but at 1000ms I think that's unlikely, but obviously I can't connect to find out so won't be able to investigate until tomorrow morning. Are there any tricks for connecting to a troublesome connection like that? Any way to fiddle with TCP options to send 2 copies of each packet (to overcome packet loss) and increase timeouts etc? It won't do me much good tonight but could be useful in the future. All I can really think of is to reduce MSS to give me smaller packets which might be less likely to be dropped (assuming the problem is line noise and not congestion). Thanks James

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TSO ethtool and kernel panic
by Russell Coker 04 Jan '12

04 Jan '12

I have four systems running drbd (several combinations of two-node DRBD devices) which all get "Digest integrity check FAILED" errors. One of the possible causes is TSO, so obivously I want to test running without it. ethtool -K eth1 rx off tx off sg off tso off gso off I ran the above command and saw the following in my logs before the system rebooted: Jan 4 14:39:10 hetz3 kernel: [3167347.964860] e1000e 0000:02:00.0: eth1: Reset adapter Jan 4 14:39:10 hetz3 kernel: [3167347.978907] xenbr1: port 1(eth1) entering disabled state Jan 4 14:39:14 hetz3 kernel: [3167351.681827] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx Jan 4 14:39:14 hetz3 kernel: [3167351.682167] xenbr1: port 1(eth1) entering learning state Is it expected that you can change TSO settings while the system is running? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Put media server into low-energy state
by Colin Fee 03 Jan '12

03 Jan '12

Happy New Year All. I want to put my media server at home into a low-energy state when no one is at home e.g. now when both myself and my wife are at work, or say overnight when we are sleeping. It runs Ubuntu Server 10.04. What strategies and utilities should I use? -- Colin Fee tfeccles(a)gmail.com

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Latrobe University vpn
by stripes theotoky 01 Jan '12

01 Jan '12

Hi All wishing you a happy New Year, has anyone in the group ever managed to connect to La Trobe Univeristy's vpn services from a linux box? If so how? The only options that IT gives me is Cisco Anyconnect for Windows or Apple. I have tried it under Windows 7 64 running in Virtual Box and can get a connection but once connected I can't get to any url either inside or outside the University. I would prefer a pure Linux solution, it is overkill running Virtual Box and Windows 7 just to get to a web browser. Stripes.

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Dell Inspiron 9400 - Anyone had any luck getting Sigmatel chip to output SPDIF signal to receiver?
by Anthony Hogan 24 Dec '11

24 Dec '11

Hi all, Recently got my hands on a Marantz 5.1 receiver with SPDIF in. Notebook I have (which plays the part of media PC when I'm at home - XBMC running over WiFi using NFS + MySQL) is a Dell Inspiron 9400. Has a Sigmatel audio chipset with a breakout cable that provides SVHS and Composite video alongside SPDIF audio output. The latter I can't figure out how to activate under Ubuntu (had 11.04, upgraded to 11.10). Tried setting pulseaudio device profile to IEC958 out and didn't make any difference. There were some IEC958 tickboxes in gnome-alsamixer too that didn't seem to do much. Anyone ever used the digital output of a Dell notebook with a sigmatel codec in Linux? Any modprobe argument magic needed? Anthony

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Night Market - 11th or 25th Jan
by Donna Benjamin 24 Dec '11

24 Dec '11

Had a few people sign up for the 25th now... http://linux.conf.au/wiki/index.php/Melbourne_Night_Market And have also created a sign up page for people NOT attending LCA http://sync.in/NightMarket So if you want to extend the invite out to other folks who might be in the Melbourne neck of the woods around that time... please feel free to do so. - D. Also - still spots available at DrupalDownunder if you want MOAR geekery of the web-based kind the weekend before LCA. Or perhaps you know some Drupal folks I don't? Please make sure they know about #DDU2012 :) http://drupaldownunder.org -- Donna Benjamin ph: 0418 310 414 Core team member - http://drupaldownunder.org Bringing web professionals and enthusiasts together to connect, learn and create. 13-15 January 2012 at the Jasper Hotel, Melbourne.

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Procmail filtering an mbox file into Maildir
by Brett Pemberton 21 Dec '11

21 Dec '11

Hi, I'm trying to get the last of my 'old' mail filtered into an existing Maildir setup. It currently exists in two formats: 24 mbox files, 2004/january-december, 2005/january-december equivalent Maildir folders for the above. What I'd like to do is write a simple procmail file and gradually filter it all into existing maildir format, for example: :0 * ^List-Id:.*<luv-main.luv.asn.au> $HOME/Maildir/.mailing-lists.luv/ Run procmail over all of the mbox or maildir folders, whatever is easiest, putting all the matching messages into .mailing-lists.luv, and leaving the rest, for me to investigate and add another filter for some more mail, re-running until I just have a handful left that I can move manually to the right places. However, I can't seem to get procmail to work, for memory or google. It seems to just continually process the first email in the mbox files, a 'dummy' message added by pine. Any suggestions or hints? cheers, / Brett

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