luv-main November 2012

luv-main@luv.asn.au

49 participants
25 discussions

by DanyJ

Hello LUVers I have been experiencing an increase of about 5x factor in my outgoing network traffic for a while -at least last week - I cannot explain that change in activity,configuration etc... (It does peak to much higher level at a specific time, but I have worked out why that was so.. a overgrown backup file that was being transfered daily) So I need to find out what that traffic is. What is a recommended log analysers to help me quickly here? Want it to tell me how much data is being transfered by which protocol Or any recommended procedure to identify that traffic? Any ideas please? Its a Ubuntu 10.04 server, running Apache, Postfix and related stuff (Spamassassin, Amavisd etc) (I had varnish on it, but I turned it off) Cheers Daniel.

10 years, 4 months

ARM v6 (Raspberry Pi) vs ARM v7 (BeagleBone)

by Toby Corkindale

Synopsis: ARM v6 CPUs are significantly slower than ARMv7 CPUs at the same clock speed, at least when running Debian (armhf) on them. I know it's a rather naive benchmark, but I tried running a tiny Perl program to find all the prime numbers under 100,000 on both the Raspberry Pi and the BeagleBone. They're both 700 MHz ARM CPUs, but the Raspberry runs on the older v6 spec CPU. Surprisingly, this seems to make a huge difference to performance. My desktop (3GHz i7) - 3.3 seconds BeagleBone (720 MHz ARMv7)- 68 seconds Raspberry Pi (700 MHz ARMv6) - 125 seconds I thought I'd try it quickly in Scala, but it seems the JVM isn't very well optimised on ARM yet :( So I tried it with just doing primes to 10,000 instead. Desktop - 0.33 s Beagle - 19 s (zero) / 34 s (jamvm) Raspberry - 58 s (jamvm) / 79 s (zero) It's curious to note that the best JVM varies between the architectures; Zero was a lot faster than JamVM on the Beagle, but it was a lot slower on Raspberry Pi. (for this naive benchmark) Does anyone know why that is, or if there's any way to get better jvm performance?

10 years, 4 months

Data exchange between Linux and iPad

by Peter Ross

Hi, my daughter has a new iPad now, it is a requirement at the college she goes. Great, that fossil does not even know what to to with a USB stick? Any workarounds? I guess I could put the data on the Linux side under a webserver's root. Other ways? Does Apple still supports Apple File Server (would be netatalk on the Linux side?) I really hate computers that are just made with $$ in the eyes, without any intention to provide a good product to the customers. Compared to the iPad, the Android based ZaTab is much friendlier to its environment. A fortnight ago I had four kids, aged 9 to 12, at home. The played using three tablets (2 ZaTabs, 1 iPad) and they did not care at all which brand it was - it looked so similar they did not notice. Regards Peter

10 years, 4 months

Re: ipad in education (was: Data exchange between Linux and iPad)

by Bianca Gibson

On Nov 20, 2012 9:23 AM, "Trent W. Buck" <trentbuck(a)gmail.com> wrote: > > Russell Coker <russell(a)coker.com.au> writes: > > ebook reader might be cost effective because you can study at night > after the library closes, without having to cart dead trees back and > forth, and with access to content that would otherwise require a trip to > the state library. They also run for a *very* long time, and are cheaper, smaller and lighter than in ipad. As a uni student I find my ereader really useful. > Are you assuming every student buys every textbook, and throws it away > at the end of the year? At my mostly middle class school we tried to buy and sell books with our friends, and if that failed they were sold and bought through the school. If you got them second hand and kept them in good shape you could break even.

10 years, 4 months

Re: ipad in education (was: Data exchange between Linux and iPad)

by Tony Langdon

At 11:20 AM 11/20/2012, Brian May wrote: >On 20 November 2012 11:12, Bianca Gibson ><bianca.rachel.gibson(a)gmail.com> wrote: > > They also run for a *very* long time, and are cheaper, smaller and lighter > > than in ipad. As a uni student I find my ereader really useful. > >Not to mention readable in sun glare. > >I find my Galaxy 10.1 completely useless on the train on some days, I'd agree totally. For serious reading, ereaders leave tablets for dead, especially in outdoor and other bright conditions. 73 de VK3JED / VK3IRL http://vkradio.com

10 years, 4 months

Re: Data exchange between Linux and iPad [Scanned]

by Christopher M. Bailey

Agreed, I'm using Dropbox to share files between Linux PCs, Doze boxes, a Nexus tab and my phone all without a hitch Sent from my GT-I9305T on the Telstra 4G networkJobst Schmalenbach <jobst(a)barrett.com.au> wrote:what about google (drive/docs) and/or dropbox? Jobst On Mon, Nov 19, 2012 at 10:16:33AM +1100, Peter Ross (Peter.Ross(a)bogen.in-berlin.de) wrote: > Hi, > > my daughter has a new iPad now, it is a requirement at the college she > goes. > > Great, that fossil does not even know what to to with a USB stick? Any > workarounds? > > I guess I could put the data on the Linux side under a webserver's root. > Other ways? Does Apple still supports Apple File Server (would be netatalk > on the Linux side?) > > I really hate computers that are just made with $$ in the eyes, without > any intention to provide a good product to the customers. > > Compared to the iPad, the Android based ZaTab is much friendlier to its > environment. > > A fortnight ago I had four kids, aged 9 to 12, at home. The played using > three tablets (2 ZaTabs, 1 iPad) and they did not care at all which brand > it was - it looked so similar they did not notice. > > Regards > Peter > _______________________________________________ > luv-main mailing list > luv-main(a)luv.asn.au > http://lists.luv.asn.au/listinfo/luv-main -- Dont blink or you miss it! | |0| | Jobst Schmalenbach, jobst(a)barrett.com.au, General Manager | | |0| Barrett Consulting Group P/L & The Meditation Room P/L |0|0|0| +61 3 9532 7677, POBox 277, Caulfield South, 3162, Australia _______________________________________________ luv-main mailing list luv-main(a)luv.asn.au http://lists.luv.asn.au/listinfo/luv-main -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

10 years, 4 months

Documentation in a hostile environment

by Scott Penrose

Hi LUV Main I have kept documentation in any formats from plain text, pod, apt, to docbook, tex and more. But I have never had to use Word (yes lucky me). I tend to have a Makefile, that does all the file converting necessary (e.g. turn my Mindmap into SVG into JPG, or similar). And of course, using Docbook (or APT to docbook) or TeX I can control all the formatting. Which leads me to my question. I am working now in an environment which is all word on dropbox. I am going crazy with formatting issues, corrupt documents (I have even installed MS Word on my Mac laptop to see if I can work around the problems by going to the source). A quick think suggests solutions for me is one of the following: * Modular word docs and use includes - not ideal still problems with formatting etc * Wiki (there is a Confluence system available for me to use) - but no offline editing, and terrible word/pdf output formatting * Build system (some text editable format I can use to generate the word docs). For the moment, the lucky thing is that I am working on these particular document mostly alone. That may not last and that is where the Wiki comes in, because at least the barrier to entry for the non-technical staff is low. Long story short, I am looking for examples, recommendations and personal experience. What would you use? Thanks Scott

10 years, 4 months

background fsck service - any tools?

by Andrew Worsley

Is there any tool that will unmount a filesystem and fsck say once every 2-3 months to avoid having the massive slow fsck on the reboot every 6-12 months? If not I am thinking of a cron job that tries to umount the filesystem in the middle of the night, run a basic fsck and if all goes well remounts it mailing the results to root. I have a modest root/usr partitions but the larger other partitions only used for recording TV take 30+ minutes to do the occasional fsck and that always is demanded sometimes very inconveniently on a reboot. Andrew

10 years, 4 months

FYI: backend Exetel change breaks pppd (solved)

by trentbuck＠gmail.com

Exetel made some changes to their backend on Fri which screwed me. I investigated this morning and now have a fix, detailed below. pppd is pretty cargo-culty, so let me know if I'm missing any best practice options. * * * I believe this issue is now resolved. By explicitly disabling PAP authentication, I get a public address (58.96.65.206). Detailed analysis follows. On Tue Nov 13 16:08:25 2012 +1100, we changed our CHAP password to the new one you supplied. Prior to that, our PPP configuration was unchanged since 19 Jul 2012. The following logs show the last correct PPP negotiation, and the first incorrect negotiation. PLEASE NOTE in both cases AUTHENTICATION SUCCEEDS. 2012-11-09T17:19:08.008040+11:00 alpha pppd[6844]: Using interface ppp1 2012-11-09T17:19:08.008071+11:00 alpha pppd[6844]: Connect: ppp1 <--> 0.8.35 2012-11-09T17:19:11.089919+11:00 alpha pppd[6844]: CHAP authentication succeeded 2012-11-09T17:19:11.089947+11:00 alpha pppd[6844]: CHAP authentication succeeded 2012-11-09T17:19:11.167105+11:00 alpha pppd[6844]: Cannot determine ethernet address for proxy ARP 2012-11-09T17:19:11.167135+11:00 alpha pppd[6844]: local IP address 58.96.67.67 2012-11-09T17:19:11.167152+11:00 alpha pppd[6844]: remote IP address 58.96.2.202 2012-11-09T17:20:16.098565+11:00 alpha pppd[6844]: No response to 3 echo-requests 2012-11-09T17:20:16.098595+11:00 alpha pppd[6844]: Serial link appears to be disconnected. 2012-11-09T17:20:16.098643+11:00 alpha pppd[6844]: Connect time 1.1 minutes. 2012-11-09T17:20:16.098661+11:00 alpha pppd[6844]: Sent 420 bytes, received 420 bytes. 2012-11-09T17:20:22.119564+11:00 alpha pppd[6844]: Connection terminated. 2012-11-09T17:20:22.181547+11:00 alpha pppd[6844]: Modem hangup 2012-11-09T17:45:21.300013+11:00 alpha pppd[6844]: Using interface ppp1 2012-11-09T17:45:21.300043+11:00 alpha pppd[6844]: Connect: ppp1 <--> 0.8.35 2012-11-09T17:45:24.473407+11:00 alpha pppd[6844]: PAP authentication succeeded 2012-11-09T17:45:24.531114+11:00 alpha pppd[6844]: Cannot determine ethernet address for proxy ARP 2012-11-09T17:45:24.531144+11:00 alpha pppd[6844]: local IP address 10.35.14.66 2012-11-09T17:45:24.531161+11:00 alpha pppd[6844]: remote IP address 220.233.1.169 2012-11-09T18:45:24.515123+11:00 alpha pppd[6844]: LCP terminated by peer 2012-11-09T18:45:24.515185+11:00 alpha pppd[6844]: Connect time 60.0 minutes. 2012-11-09T18:45:24.515204+11:00 alpha pppd[6844]: Sent 0 bytes, received 0 bytes. 2012-11-09T18:45:27.532734+11:00 alpha pppd[6844]: Connection terminated. 2012-11-09T18:45:27.597564+11:00 alpha pppd[6844]: Modem hangup Our modem runs Ubuntu 10.04, with pppd 2.4.5~git20081126t100229-0ubuntu3. Our ppp configuration is as follows (password is elided). options:asyncmap 0 options:noauth options:crtscts options:lock options:hide-password options:modem options:proxyarp options:lcp-echo-interval 5 options:lcp-echo-failure 3 options:noipx peers/internode:user "UNPRINTABLE(a)internode.on.net" peers/internode:plugin pppoatm.so peers/internode:1.8.35 peers/internode:noipdefault peers/internode:persist peers/internode:maxfail 0 peers/internode:noauth peers/internode:nodeflate peers/internode:linkname internode peers/internode:nodetach peers/exetel:user "UNPRINTABLE(a)vic.exetel.com.au" peers/exetel:plugin pppoatm.so peers/exetel:0.8.35 peers/exetel:noipdefault peers/exetel:persist peers/exetel:maxfail 0 peers/exetel:noauth peers/exetel:nodeflate peers/exetel:linkname exetel peers/exetel:nodetach chap-secrets:UNPRINTABLE@vic.exetel.com.au * "UNPRINTABLE" * PLEASE NOTE that we have a password configured in chap-secrets, but not in pap-secrets. I speculate that the current issue is caused by a combination of the following: - our modem currently tries PAP before CHAP - you used to reject PAP, so we proceeded to CHAP which works. - you now accept PAP, but give a private IP. Possibly this is misconfiguration; possibly it's some kind of "captive portal"-style artefact to help users with misconfigured modems. Experimentally, I added "refuse-pap" to peers/exetel. After this, the point-to-point link has reasonable addresses: 2012-11-14T11:58:21.762615+11:00 alpha pppd[3208]: Using interface ppp1 2012-11-14T11:58:21.762784+11:00 alpha pppd[3208]: Connect: ppp1 <--> 0.8.35 2012-11-14T11:58:23.906234+11:00 alpha pppd[3208]: CHAP authentication succeeded 2012-11-14T11:58:23.906261+11:00 alpha pppd[3208]: CHAP authentication succeeded 2012-11-14T11:58:23.990924+11:00 alpha pppd[3208]: Cannot determine ethernet address for proxy ARP 2012-11-14T11:58:23.990954+11:00 alpha pppd[3208]: local IP address 58.96.65.206 2012-11-14T11:58:23.990972+11:00 alpha pppd[3208]: remote IP address 220.233.1.171

10 years, 4 months

Window managers, multi-head and Xinerama

by Toby Corkindale

I've never had a whole lot of success with running more than two screens on X. I say that on a system with three heads and on which I've run up to four for a laugh, but I'm not that happy with it so looking for advice. I have two nVidia cards, for a total of four outputs. I have these configured in xorg.conf using Xinerama. Although GLX loads and appears to work, I'm missing XRANDR and COMPOSITE extensions as these aren't compatible with Xinerama. This really limits me in the window managers I can run.. Gnome 3 shell, Unity and Cinnamon all die horribly, Compiz is impossible to get going, and many others just don't "get" multi-head. XFCE seems to work fine, which is what I've been using for a while, but I really miss having all the niceties of Compiz and Cinnamon. What setup do you use 3+ monitor multi-head on Linux? Cheers, Toby

10 years, 4 months

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luv-main November 2012