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Questions tagged [frequency]

21 questions
15
votes
3 answers

Setting up multiple wireless access points on same network

I'd like to add wireless to my network, and I need multiple access points to cover the whole area. I'd like to set them up so that there's only one "wireless network" that the clients see, and it switches them as seamlessly as possible between…
SqlRyan
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5
votes
0 answers

Do I really need the PHP maxlifetime hourly cron job?

On my Debian Wheezy, every half-hour a cron job runs: find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -ignore_readdir_race -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete) This deletes oldish PHP…
einpoklum
  • 1,825
5
votes
8 answers

How often does your company replace all its servers?

Companies I have worked for replace them every 3 years
Techboy
  • 1,602
4
votes
2 answers

WiFi: Frequencies that map to non-overlapping 2.4 GHz channels 1,6 & 11

I'm configuring a wireless router. I know the non-ovelapping channels are 1,6 & 11. However, my router only specifies frequencies that I can select, not channels. What are the frequencies that map to channels 1,6 & 11?
F1Linux
  • 465
3
votes
2 answers

How can I use grep to find the most frequently recurring errors in my log file?

I've got a PHP application that is generating large amounts of warnings and notices in the log file.. I'm fixing these one at a time. I would like to be able to fix the most frequently occurring first in order to maximize the amount of effect my…
Edward Tanguay
  • 1,259
2
votes
1 answer

Intel Turbo not working in CentOS 7 with Intel Xeon Scalable (and other newer CPUs)

We have a small cluster where I work, that I look after. The nodes run CentOS 7.5. Our older nodes use Xeon E5 v4 CPUs, mostly the E5-2699 v4. With the older nodes, the Intel Turbo Boost works properly, and individual cores of the CPU are free to…
Maculin
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2
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3 answers

What are the most common protocols on the internet?

For 69 views in the first day, 2 up-votes within 2 days, it's a shame that this was closed. What are the commonly used protocols that sit atop TCP/IP and UDP/IP? My list includes HTTP and BitTorrent. I know those are popular, what I am curious is…
unixman83
  • 1,972
1
vote
1 answer

Microwave Link Latency

An internet provider installed us a microwave link: The issue is that: The ping from our side to the gateway is about 1-2 ms, which is great, but it remains like this for only 12 hours, then it start to give latency and time outs 100 - 800 ms. The…
MohyedeenN
  • 1,111
1
vote
2 answers

How to mearsure the average cpu frequency in linux?

I'm trying to measure the average cpu frequency in an DVFS enabled cpu for specific interval , the obvious way of periodically sampling /proc/cpuinfo has very large variants. The cpufreq-stats driver gave me some hope ,e.g. cat…
IZhen
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vote
0 answers

Can I use higher frequency rated ECC RDIMMs on platform that supports only lower frequency?

I have a 1st gen EPYC 7XX1 platform that supports only up to 2666MHz freq ECC RDIMMS. I would like to add more ram to this platform and I was thinking about purchasing 3200MHz modules for future proofing. I'm planning on using those 3200MHz modules…
The amateur programmer
  • 93
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1
vote
1 answer

Is it safe to set RAM frequency beyond Intel's POR?

Memory in our SuperMicro servers runs on a somewhat lower frequency than it could and it seems to be artificially limited by the Enforce POR BIOS setting. SuperMicro warns on their website that "there is no guarantee" if this setting is…
Ondra Simek
  • 266
1
vote
0 answers

CPU frequency in KVM vps

Is it possible to display CPU max and min frequency in a KVM vps using Libvirt on server ? It only shows CPU mhz in vps and not max and min mhz as seen on server in lscpu command output.
Jevin Gala
  • 69
0
votes
1 answer

How do I change the minimum working frequency?

The file /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_frequency reads a value of 800 Mhz. The powertop tool also suggested that 800 Mhz w3as the minimum frequency being used. I changed the above-mentioned file to 1.6 GHz and monitored powertop…
kashyapa
  • 337
0
votes
1 answer

Memory clock on DDR2 modules lower than expected

I've performed a memory upgrade on a Dell Precision T7400. The official user guide states: Specifications Memory type: 667- or 800-MHz fully-buffered DDR2 SDRAM fully-buffered DIMMs (FBDs) Minimum memory: 1 GB Maximum memory: 64 GB with…
Reinderien
  • 232
0
votes
1 answer

How do I amend the RoamingPreferredBandType property of my users' wireless network adapters?

We've been seeing intermittent issues with users connecting to wifi. It seems that this may be due to interference, with the recommended solution being to change the RoamingPreferredBandType to 5GHz. Per this thread, this can be done by amending…
JohnLBevan
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