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Questions tagged [latency]

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Simple file copy (or write) causes ten second+ latency on Linux filesystem

I am running Linux on a spinning hard drive. WDC WD5000LPLX-7, "WD Black Mobile", 7200 RPM. I noticed a simple file copy (or write) causes fsync() latencies of over ten seconds. Is there some way ...
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Control Internet Bandwidth with tc on Raspberry Pi 3?

Modem/Router is connected to Internet (192.168.1.1) No DHCP server is running on Modem/Router Devices connect to the network through Wifi provided by Modem/Router Devices receive DHCP settings ...
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134 views

How to find jitter?

I'm looking for a way to find the jitter using bash commands. I know I can use ping <Server Address> to find the latency, and then by calculating the delta between the packets I can find the ...
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183 views

iostat + what we can do if await is high

we use iostat -x and check for the await column - per device it shows the total time spent waiting plus the actual handling of the request by the disk iostat -yzx 5 Device: rrqm/s wrqm/s ...
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What is the meaning of fragments and fragment_size in PulseAudio ALSA modules?

Following advice on a blog post called Pulseaudio And Latency, I tried loading module-alsa-sink with special fragments and fragment_size parameters to ensure low latency. However, I'm not sure what ...
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1answer
174 views

What are the differences between qperf and ping test latency results?

I am wondering what are the differences between qperf and ping tests latency results. In terms of measuring latency between two servers which tool result could be considered more accurate? ping: ...
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2answers
133 views

How to debug program latency?

I'm trying to run amsynth on a rpi. Latest version of raspbian, fresh install. I tested amsynth on my x86 desktop and it works great, no latency. On the rpi however, I get a delay of around 1 sec ...
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2answers
487 views

Better performance for music production using Wine or Windows-on-Virtualbox (on Linux host)

There are two applications that I have used and familiar with on Windows 7 and 10, and would like to use also on my new Desktop running Ubuntu (with lowlatency kernel), i.e. Guitar Rig 5, and FL-...
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Very slow HTTP requests over time on embedded Linux

An application I'm developing is gradually getting slower and slower to run HTTP/HTTPS requests over time. It's running on Buildroot embdded Linux on some quite old and slow hardware. After a few ...
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1answer
192 views

How can I determine if a latency is due to a driver or the scheduler?

Using an oscilloscope and toggling some pins I sometimes see latencies of 1-2 seconds from when an 8-byte UART packet is transmitted to when a blocking read returns. The packets are 1 second part with ...
2
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1answer
894 views

Why would SSH freeze for minutes at a time when other traffic is unaffected?

I've noticed when I SSH into a remote machine over a slow link, SSH seems to "stick" after a relatively large amount of data is transferred. For example, typing text over the link is fine, but ...
2
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1answer
718 views

High network latency after incoming UDP bursts [Solved]

This has been crossposted to https://forum.rocketboards.org/t/high-network-latency-after-incoming-udp-bursts/1266 I have an application sending UDP packets over a RAW socket (defining ETH, IP and UDP ...
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2answers
1k views

How to find out a CAS latency on my SODIMM DDR3 module?

I have a HP Probook 6470b laptop with HP MBO 179C and Intel mobile HM76 chipset. I would like to find out a CAS latency of my DDR3 memory module without opening the laptop. I was told that the SMBus ...