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Re: Best way to copy a large directory tree
by zlinw＠mcmedia.com.au 27 Mar '13

27 Mar '13

Just a couple of small points........... I have been using rsync to backup hardisk's for some years with little problem, can save ages after the first one is done. I did get a few hints though from the thread, many thanks. 2nd point, Around 4 years ago I submited a bug fix to the kernel and had a nice conversation with one of USB driver developers in the kernel. He stated the major limiation with USB2 was the abilty of the USB chipsets on the mother board to commucicate with the PCI bus. He did quote max transfer figures for different chipsets and they were nothing like the USB2's spec. Using Linux for 20 years, Lindsay

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openwrt and routing performance
by James Harper 27 Mar '13

27 Mar '13

I have a netgear wndr3800 running OpenWRT aa rc1. The wndr3800 has gigabit ports but the most I can get through it with iperf is an average of around 80mbits/second (varying between 30 and 150). Because I can regularly see over 100 I can confirm that the ports are gigabit connected. It's configured such that port 1 is on a 192.168.0.0/24 network and port 2 is on 10.1.0.0/16 network and it routes between the two. I don't expect to get gigabit performance or anything out of it, it's only a little CPU after all, I'm just wondering if there are any tricks I can use to get a bit of extra boost out of it (software tricks - not interested in overclocking). It's also an internet gateway so needs to run iptables. I tried using the notrack target for packets between the two networks but then performance dropped to under 20mbits/second. Any suggestions? Thanks James

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graphite deployments
by Ashley Baumann 21 Mar '13

21 Mar '13

Hi Is anybody on the list using a large scale graphite deployment? The company I work for is thinking of deploying graphite across our production infrastructure (3000 machines in 20 DCs) and I was hoping to pick someone's brains for layout hints, tips and gotchas. TIA Ashley

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server stopped resolving dns for domain
by James Harper 21 Mar '13

21 Mar '13

I have a server that now refuses to resolve dns for the local domain (say xxx.local) Tcpdump shows no outgoing queries on port 53 for that domain. Nscd is not being used. Any other domain works just fine. So for example, I have a host called xxxdc1.xxx.local. Resolve.conf contains: search keech.local nameserver 192.168.0.235 "ping xxxdc1" does all the correct things (dns traffic visible, icmp responses). "ping xxxdc1.xxx.local" or "ping xxxdc1.xxx.local." does nothing. No dns traffic, just an eventual unknown host message. I can reboot the server tonight but I'm a bit suspicious that something else is going on. Any suggestions? Thanks James

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Re: Video problems - NVidia/Nouveau
by zlinw＠mcmedia.com.au 20 Mar '13

20 Mar '13

A couple of points >> Check the temperature of the card too. Try and see if increasing the load >> on it can trigger the condition. Also compare the cards diagnostics in >> Linux and Windows. >I can do the first two, but not the third (no Windows around here). >nouveau-pci-4000 >Adapter: PCI adapter >temp1: +81.0°C (high = +100.0°C, crit = +120.0°C) >That's with the machine mostly idle. As far as I am concerned that temps way to high for an idle video card, if its the cards real temp. Next time you turn the system on try to read the temp as soon as possible to see if starts out near room temp. Even being pushed with a lot of 3D work the temps on my system, video card being a Radeon 5870, rarely exceed 65 degrees C. If the temp is real may be the card has an air flow restriction, say to many cables around the place, or if it has a fan it requires cleaning and a drop of oil. Second point may be minor, I am slightly suspicious of the monitor not coming back after being switched off and on. I have struck some older monitors that will not sync to a high resolution signal when restarted but it would be rare these days. Using Linux now for a few months under twenty years, Lindsay

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Any Linux Format subscribers?
by Terry Duell 20 Mar '13

20 Mar '13

Hello All, If you subscriber to Linux Format, have you received your copy of LXF169 (April 2013)? They usually appear within about 2 weeks of the publication date, but this one is quite late. Cheers, -- Regards, Terry Duell

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freeze when using google or youtube
by James Harper 16 Mar '13

16 Mar '13

Just lately, maybe in the last few months, I've had periodic freezes when using google or playing youtube videos. Youtube will seem to hang for 10-30 seconds and then suddenly come to life. Google image searches might fail to load a few images. Nothing major but kind of sounds like there is an underlying problem. I haven't noticed it with anything else, just the google related stuff. Has anyone else noticed this or is it just me? Thanks James

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Laptop recommendation
by Gerd Berner 13 Mar '13

13 Mar '13

Hi all Has anyone recently purchased a new laptop that they can recommend with good support for Linux drivers? I am thinking 14" screen. Cheers Gerd

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USB3 disk problems
by James Harper 13 Mar '13

13 Mar '13

Our nightly backups outgrew the 500GB disks I was using so I've bought some 1TB disks, and they aren't working properly. Both the old and new disk are USB3 disks on a USB3 controller which seems to require a reboot every 50 plug/unplug cycles or so but otherwise previously worked well. The symptoms are: [ 7455.667194] sd 16:0:0:0: [sdj] Attached SCSI disk [ 7690.448638] EXT3-fs error (device sdd1): ext3_find_entry: reading directory #2 offset 0 [ 7690.448972] Buffer I/O error on device sdd1, logical block 0 [ 7690.448994] lost page write due to I/O error on sdd1 [ 7690.448999] EXT3-fs (sdd1): I/O error while writing superblock [ 7690.449056] EXT3-fs (sdd1): error: ext3_journal_start_sb: Detected aborted journal (the first message is an indication of when I plugged the disk in, the second is the start of it having errors) The disk itself seems okay and doesn't fail at a specific sector each time or anything, and I've tried another disk too. The USB3 cable is quite long, so I've replaced it with a shorter one and so far it's backed up 10GB since I started writing this email. On other tests it's written out around 200GB before failing. The possibilities I can think of are: . cable bad (it's well less than 3M) . usb disk incompatible with controller (USB3 controllers of that vintage are a bit hit and miss) . usb disk drawing too much power (shouldn't USB log an error about this? Are there tools to check?) . bad batch of drives (all pass smart tests) . something else Any thoughts? It's one of those problems that takes hours to test each troubleshooting step and meanwhile offsite backups are not getting done (20GB now and counting!) Thanks James

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wpa_supplicant must run twice
by Toby Corkindale 13 Mar '13

13 Mar '13

I spent ages last night getting wireless working on an embedded ARM device. The problem is that the first time wpa_supplicant runs, it can't see any SSIDs, and doesn't get anywhere. The second time it runs, it's all fine. My eventual solution was to create a script that runs wpa_supplicant, waits five seconds, kills it, then runs it again. So, so dirty. This issue only appears to occur with one of my three USB wifi adapters. However of the others, one isn't supported by any version of Linux, and the other one is dodgy on 3.2 kernels.. but post 3.2.x kernels don't work reliably on this hardware. Soo.. while I wait for a fourth bloody USB adapter with yet another wifi chipset in it to arrive.. does anyone have any ideas how to fix the current one? I'm guessing there's something specific the wifi adapter needs initialised before it will work, but I just don't know what.. Cheers, Toby

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