Arch-general May 2018

arch-general@lists.archlinux.org

42 participants
22 discussions

[arch-general] Reliability test for hard drives and SSD
by Andrey Ponomarenko 10 Aug '18

10 Aug '18

Hi there! Good news for all interested in hardware compatibility and reliability. I've started a new project to estimate reliability of hard drives and SSD in real-life conditions based on the SMART data reports collected by Linux users in the Linux-Hardware.org database since 2014. The initial data (SMART reports), analysis methods and results are publicly shared in a new github repository: https://github.com/linuxhw/SMART. Everyone can contribute to the report by uploading probes of their computers by the hw-probe tool! The primary aim of the project is to find drives with longest "power on hours" and minimal number of errors. The following formula is used to measure reliability: Power_On_Hours / (1 + Number_Of_Errors), i.e. time to the first error/between errors. Please be careful when reading the results table. Pay attention not only to the rating, but also to the number of checked model samples. If rating is low, then look at the number of power-on days and number of errors occurred. New drive models will appear at the end of the rating table and will move to the top in the case of long error-free operation. Thanks to ROSA, Arch, Fedora, Ubuntu, Debian, Mint, openSUSE, Gentoo users and others who had made this work possible by contribution to the database!

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[arch-general] [Classroom] Python for Beginners - Part 1
by fsckd 13 Jun '18

13 Jun '18

Hello, The class Python for Beginners - Part 1 will be held on Wednesday, October 04, 2017 at 16:00 UTC in the channel #archlinux-classroom on the freenode network. The class is expected to run for about 2 hours. This class will introduce you to programming with Python and how to use IPython with an editor/IDE. Commonly used built-in functions and libraries will be explained. Other topics will explored based on participant interests. The class will be screen-shared live (via YouTube), and later archived with subtitles. Questions and some discussion on IRC is expected, however the main part will be video and audio. In preparation for the class, install the Jupyter notebook. ``pacman -S jupyter`` or, in a Python 3 virtualenv, ``pip3 install jupyter``. Also check out the python-beginners git repository on Arch Classroom's GitHub[1] where you will find IPython notebooks and links to useful resources on learning Python: https://github.com/archclassroom/python-beginners pulec is an Arch Linux user since 2012, gamer and gardener. He makes a living using Linux and Python since 2013 and recently joined Red Hat. He hopes to spread IT knowledge and open source ideas to the general populace. Some code - https://github.com/Pulecz

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[arch-general] Set ip lan address /etc/environment
by Maykel Franco 05 Jun '18

05 Jun '18

Hi, I put this text in /etc/environment: $ source /etc/environment ip="$(ifconfig | grep -A 1 'eth0' | tail -1 | cut -d ':' -f 2 | cut -d ' ' -f 1)" $ echo $ip 192.168.0.33 Works fine, but when I reboot my archlinux: $ echo $ip $(ifconfig | grep -A 1 'eth0' | tail -1 | cut -d ':' -f 2 | cut -d ' ' -f 1) What's happened?? Is necessary exec source /etc/environment after every reboot? Thanks in advanced.

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[arch-general] KDE plasma, baloo and UI/video playback freezes
by Francesco Porro 02 Jun '18

02 Jun '18

Hi, My problem is: when I'm watching a video, running Konversation in the background with logging on disk enabled, the playback of video slows down, freezes for a while. Running iotop and ksysguard I found that baloo_file_extractor is writing on disk a big amount of data, filling the write queue; balooct monitor shows baloo is indexing Konversation's logs file changes. Peaks of 60-90 MB/s of data on mechanical hdd are generated and the playback of videos (or audio, or other GUI-related tasks) slow down or freeze. Very very annoying. I'm running updated versions of: KDE plasma (5.12.5), kernel (4.16.7), baloo (5.45); CFQ I/O scheduler on sda. On the same machine, the same version of softwares, the same configurations (of programs, mounts, IO scheduler) BUT on a Debian sid install (home is shared between installs) is NOT showing the same issue. On Debian, playback is running smootly even if baloo_file_extractor is heavly loading IO writes queue. On each installation I added this tweaks, to improve Vm management by the kernel: [frapox@tungsteno ~]$ cat /etc/sysctl.d/local.conf vm.dirty_background_ratio = 2 vm.dirty_ratio = 5 vm.vfs_cache_pressure = 60 I also tried to recompile the Arch kernel with CONFIG_PREEMPT_VOLUNTARY=y, to reflect the same default compile setting of Debian, but the issue wasn't solved. So i'm wondering which other config files or settings/tweaks I can look into to overcome this issue on Arch linux (I'd really love to keep on use Arch as my main OS). Thanks in advance. -- fp

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Re: [arch-general] arch-general Digest, Vol 163, Issue 29
by Candy Adkins 01 Jun '18

01 Jun '18

Please remove me from this list I didn't ask for your emails Candy ???? ________________________________ From: arch-general <arch-general-bounces(a)archlinux.org> on behalf of arch-general-request(a)archlinux.org <arch-general-request(a)archlinux.org> Sent: Thursday, May 31, 2018 7:00:01 AM To: arch-general(a)archlinux.org Subject: arch-general Digest, Vol 163, Issue 29 Send arch-general mailing list submissions to arch-general(a)archlinux.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.archlinux.org/listinfo/arch-general or, via email, send a message with subject or body 'help' to arch-general-request(a)archlinux.org You can reach the person managing the list at arch-general-owner(a)archlinux.org When replying, please edit your Subject line so it is more specific than "Re: Contents of arch-general digest..." Today's Topics: 1. Re: Set ip lan address /etc/environment (Ralph Corderoy) 2. Re: Set ip lan address /etc/environment (Leonid Isaev) ---------------------------------------------------------------------- Message: 1 Date: Thu, 31 May 2018 10:44:25 +0100 From: Ralph Corderoy <ralph(a)inputplus.co.uk> To: General Discussion about Arch Linux <arch-general(a)archlinux.org> Subject: Re: [arch-general] Set ip lan address /etc/environment Message-ID: <20180531094425.CAC71200E3(a)orac.inputplus.co.uk> Content-Type: text/plain; charset=utf-8 Hi Maykel, > I need define variable called ip with current ip address machine... > And when reboot machine, the variable ip always has ip address. Yes, I think we all figured that bit out. :-) But why; what's going to be using that IP-address environment variable, and when? -- Cheers, Ralph. https://plus.google.com/+RalphCorderoy ------------------------------ Message: 2 Date: Thu, 31 May 2018 04:01:16 -0600 From: Leonid Isaev <leonid.isaev(a)jila.colorado.edu> To: arch-general(a)archlinux.org Subject: Re: [arch-general] Set ip lan address /etc/environment Message-ID: <20180531100116.GA22183(a)takahe.colorado.edu> Content-Type: text/plain; charset=us-ascii On Thu, May 31, 2018 at 10:44:25AM +0100, Ralph Corderoy wrote: > Hi Maykel, > > > I need define variable called ip with current ip address machine... > > And when reboot machine, the variable ip always has ip address. > > Yes, I think we all figured that bit out. :-) > But why; what's going to be using that IP-address environment variable, > and when? Indeed. Is it for consumption of users whose shell you don't know? Is it for scripts, like cron jobs? In the former case, see what is in /etc/shells, and drop a script to /etc/profile.d, one for each shell. But that will be for login shells. In the latter case, I am afraid you need to define it each time... Finally, a bit of a puzzle, what are you going to do when the network goes down, i.e. should the variable be unset or updated? In other words, how certain are you that the IP address remains unchanged throughout the machine uptime? -- Leonid Isaev ------------------------------ Subject: Digest Footer _______________________________________________ arch-general mailing list arch-general(a)archlinux.org https://lists.archlinux.org/listinfo/arch-general ------------------------------ End of arch-general Digest, Vol 163, Issue 29 *********************************************

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[arch-general] Where can I 'setterm -blank 5 -powerdown 6' as part of the boot process/systemd startup?
by David C. Rankin 01 Jun '18

01 Jun '18

All, /sys/module/kernel/parameters/consoleblank is set to 0 by default in a change that occurred a while back. Since then, the normal text console will no longer blank or powerdown leaving your monitor on 24/7. This affects a couple of Arch servers I have. Since then I have just been turning the monitors off. Where in the boot/systemd startup can I call setterm to re-enable to normal console blank and powerdown? Remotely I can call: # TERM=linux setterm -blank 5 -powerdown 6 >/dev/tty0 </dev/tty0 to enable blank and powerdown post-boot, but I simply want to set this to be the default. Where best to set this? (passing the kernel parameter 'consoleblank=300' does not enable powerdown, so both must be set) -- David C. Rankin, J.D.,P.E.

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[arch-general] Distribution license of package information on the website?
by Hong Xu 31 May '18

31 May '18

Hi everyone, I'm interested in collecting the metadata of all packages. I intend to do this by crawling the ArchLinux package listing pages (let me know if there is a better way!). However, on the package listing pages [1,2], I do not see any license information regarding how one can use these metadata. Can someone help me here? Thanks! [1]: https://www.archlinux.org/packages/ [2]: https://aur.archlinux.org/packages/ Hong

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[arch-general] nftables partially broken after kernel update to 4.16.9
by Bill Sun 30 May '18

30 May '18

Hi all, I just updated one of my computer to 4.16.9. After update, the following nft commands will not work: nft add table ip nat <--- this one works without error nft add chain ip nat prerouting { type nat hook prerouting priority 0 \; } ^ This will give me the following error message: Could not process rule: Device or resource busy. However, the default simple firewall still works. I have another computer that is still on 4.16.8, and the example above works; further, switching back to a lts kernel (4.14.41) also works. Any help is appreciated. Thanks.

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Re: [arch-general] KDE plasma, baloo and UI/video playback freezes
by Francesco Porro 29 May '18

29 May '18

You mailed me privately. Better replying to mailing list since this could be useful to others && please do not top quote. In data domenica 27 maggio 2018 15:27:13 CEST, hai scritto: > Please try different i/o schedulers and maybe ck or zen kernel > for extra BFQ. But first try deadline scheduler. And, like I > suggested, check if there's a difference in process and i/o > priority between Ubuntu and Arch KDE. How can I achieve this? I never changed the default scheduler before. I'd prefer to stay on the default kernel, because I don't have enough knowledge (and time or will) to maintain a custom kernel. The priority of the Baloo scheduler is the same between Debian and derivatives and Arch, as far as I can see. > Also, please consider filing an Arch bug with all relevant info. > Since you tested this with the same kernel version on different > distros, it's likely to be a configuration of the kernel and > applications on each distro. Sure I'll be doing that, but before I need to get more useful data to file a bug. -- fp

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[arch-general] Arch, blk-mq and megaraid_sas
by Randy DuCharme 23 May '18

23 May '18

Greetings, I'm still fooling around with this problem (scsi_mod.use_blk_mq=y fails to boot) but made *some* progress. I've found that it takes about 20-25 seconds after it dumps me into an emergency shell for the disk device nodes to show up, but when they do I can mount the root slice to /new_root, exit, and it boots and runs fine with blk-mq enabled. The thing is, it finds my root drive, which is attached to the first SATA port as /dev/sdcX, putting the 2 arrays I have on the controller as /dev/sda1 and /dev/sdb1 and no amount of BIOS fiddling seems to help. (board's an ASUS Crosshair-V Formula-Z) I've even disabled the controller as a boot candidate in CMOS and this behavior still exists. To further confound me; for grins I set up RHEL-7.5 on another drive and for some reason I don't understand, it finds the first SATA drive as /dev/sdaX. Is there some way to force Arch to do the same. I'm rather curious if that'll solve the boot issue I'm experiencing with this system. Many thanks! -- Randall DuCharme (Radio AD5GB) Powered entirely by Open Source software.

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Arch-general May 2018