luv-main May 2012

luv-main@luv.asn.au

43 participants
33 discussions

Request to Donate Laptops for Beginner's Workshop

by Clockwork PC

Hello everyone, Linux Users Victoria is looking to have a collection of dedicated laptops for the monthly Beginners' Workshops. If you have an old laptop with at least the following specs, it would go to a very good home: - Atom 1.6Ghz CPU - 1GB RAM - 40GB HDD Please reply to this thread if you have such a laptop to donate, or if you know someone who does, or if you know where such laptops are being sold off at a low price. Regards, Alexander Garber, Secretary, Linux Users Victoria

10 years, 1 month

netfilter generated keepalive packets

by James Harper

Is it possible to have netfilter generate keepalive packets for connections? I have some proprietary windows services that communicate with each other through a few Linux routers, and I suspect that some connections are timing out (or being selected for purging from the connection tracking due to other more-active connections). If netfilter could generate a keepalive in each direction sometime before timing out the connection it would be great! Any other suggestion appreciated too. The WRT54GL router will be replaced before too long with something with a lot more memory which should resolve those problems but I need an interim solution. Thanks James

10 years, 1 month

Unnecessary libata retries for media errors maybe going away soon

by Chris Samuel

On the btrfs list it was mentioned that a patch may be queued up for the 3.5 kernel to address unnecessary retries by the block layer for media errors by this patch: http://patchwork.ozlabs.org/patch/156540/ # ATA and SATA drives have had built-in retries for media errors # for as long as they've been commonplace in computers (early 1990s). # # When libata stumbles across a bad sector, it can waste minutes # sitting there doing retry after retry before finally giving up # and letting the higher layers deal with it. # # This patch removes retries for media errors only. -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC This email may come with a PGP signature as a file. Do not panic. For more info see: http://en.wikipedia.org/wiki/OpenPGP

10 years, 1 month

cheapest >1Gb connection

by James Harper

What's the cheapest way to create a high speed connection between two Linux servers these days? I'm using bundled 1Gb connections but I think they are creating a bit of a bottleneck these days. IB, FC, and 10Gb adapters aren't real cheap, even when you just go point to point without worrying about switches, but maybe there are other technologies I'm not aware of?? Thanks James

10 years, 1 month

USB problems on server

by James Harper

I have a server that seems to have a problem with USB devices. At first I thought it was the USB3 controller (v0.96 of USB3 spec or something like that - see previous thread) but I'm getting the same sort of problem with USB2 devices on the on-board controller. It's a HP ML380G5 server and has performed flawless for a few years now so I'm reluctant to point the finger at that... more likely to be a glitch in Linux. The error I'm getting is "usb 1-6: usb_sg_cancel, unlink --> -43", and google shows no results for "usb_sg_cancel, unlink --> -43" (in quotes) which is not what I would have expected if there was a known regression in the USB code. I'm running Debian kernel linux-image-3.2.0-2-amd64 - 3.2.12-1. I've already upgraded once when this happened last time but it's not a server I can reboot lightly. Any suggestions? The same USB devices seem to work fine in other computers. And the USB3 controller I thought was bad worked fine in another HP server (low end server though - ML110G6) Thanks James

10 years, 1 month

MySQL question

by Russell Coker

SELECT type,email FROM lists,aliases WHERE lists.uid='user(a)example.com'; SELECT type,email FROM lists,aliases WHERE aliases.alias='user(a)example.com' and lists.uid=aliases.uid; The above MySQL queries return results almost instantly. The below query takes ages but it should just give the union of the results of both the above queries. How can I get the result of the above two queries with a single query that doesn't take ages? I guess that the problem is that it's looking up the aliases table for every row in the lists table. How can I stop it doing that? SELECT type,email FROM lists,aliases WHERE (lists.uid = 'user(a)example.com' or (lists.uid=aliases.uid and aliases.alias='user(a)example.com')); -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

10 years, 1 month

Fwd: [ANN] btrfs.wiki.kernel.org with up-to-date content again

by Chris Samuel

FYI, the primary btrfs wiki site has gone back to kernel.org. -------- Original Message -------- Subject: [ANN] btrfs.wiki.kernel.org with up-to-date content again Date: Mon, 7 May 2012 17:44:16 +0200 From: David Sterba To: linux-btrfs(a)vger.kernel.org Hi, the time of temporary wiki hosted at btrfs.ipv5.de is over, the content has been migrated back to official site at http://btrfs.wiki.kernel.org (ipv5.de wiki is set to redirect there). cheers, david -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html

10 years, 1 month

Word/Excel 2 view in Web App, Libre/OpenOffice or others

by Peter Ross

Hi, I am writing a PHP Web application and look for a way to convert and show documents (esp. Word and Excel, old and new format) I found a Open/LibreOffice converter service: http://zawmn83.wordpress.com/2008/08/12/php-convert-microsoft-word-doc-docx… I would like to restrict the LibreOffice to this tool only. I glanced over the Makefile but could not make sense of many options. Did someone achieve this before? Or are there other ways? Thanks for ideas Peter

10 years, 1 month

Arduino

by Russell Coker

avrdude: stk500_getsync(): not in sync: resp=0x00 I'm getting the above error when I try to upload code to an Arduino Uno clone (DFRduino) from the "arduino" program on Debian/Unstable. Any suggestions on what I should do to try and fix this? Google searching suggests that the error in question can mean that the wrong board type is in use, I don't think that's the case and I tried using other board types with no success. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

10 years, 1 month

zfsonlinux ssd

by Tim Connors

I don't suppose anyone has ported arc_summary and zilstat to read the linux spl structures? http://constantin.glez.de/blog/2011/02/frequently-asked-questions-about-fla… I suspect I'd benefit greatly from l2arc in my usage (not so much zil). But I don't wanna go out and buy this yet, until I *know* it will help improve upon the 40iops I currently suffer from :) http://www.ozbargain.com.au/node/69269 -- Tim Connors

10 years, 1 month

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luv-main May 2012