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Questions tagged [latency]

Latency is the time difference between the start of an event and the time that the effects become noticeable.

271 questions
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votes
3 answers

What does "Windows is not a real-time operating system" mean?

I came across an application called LatencyMon, that apparently does latency monitoring. I have always understood that the more of a load you put on the processor, the less responsive, or more latent, the system becomes. However, in the second…
Chad Harrison
  • 6,229
21
votes
3 answers

Latency of CPU instructions on x86 and x64 processors

I'm looking for some table or something similar that could help me to calculate efficiency of assembly code. As I know bit shifting takes 1 CPU clock, but I really looking how much takes addition (subtraction should take the same), multiplication…
ST3
  • 785
18
votes
2 answers

What do the memory timings and RAM mean?

On every piece of RAM you'll see the timings like: "2-2-2-5". What is this all about? What should I buy?
ehm
  • 694
17
votes
6 answers

Does increasing upload or download speed reduce ping?

I have a 5 MB/s connection, but I always notice high ping when playing online games. When the network is stable (i.e. when pingtest.com reports the connection as 5 MB/s), the ping stays at 50 ms, but my previous connection was 2 MB/s, and it also…
lucas abilidebob
  • 195
16
votes
4 answers

Negative ping time?

This is the first time I've seen this and I'm not sure what it means; 64 bytes from 74.125.93.99: icmp_seq=6233 ttl=53 time=545.493 ms 64 bytes from 74.125.93.99: icmp_seq=6234 ttl=53 time=776.093 ms 64 bytes from 74.125.93.99: icmp_seq=6235…
Jeff Welling
  • 575
15
votes
3 answers

Network latency measurement (Linux)

I'd like to measure network latency for SNMP GET request. There is a free command line tool time which can be used to find timing statistics for various commands. For example it can be used with snmpget in the following way: $ time snmpget -v 2c -c…
omnomnom
  • 253
13
votes
3 answers

Debugging Linux I/O latency

I'm having some I/O problems on a couple of Linux systems that I administer. They manifest in that processes often block for up to several seconds in such simple syscalls as open(), unlink() or close() on files (which is a problem because some of…
Dolda2000
  • 1,253
12
votes
1 answer

VLC Caching levels

When I open the Preferences of VLC and go to Input & Codecs, I have a setting called Default Caching Level. I can choose between Cusom Lowest latency Low latency Normal High latency Higher latency I'm used to caching being set in seconds or…
Svish
  • 41,258
11
votes
1 answer

How does RAM frequency and latency differ? How does it affect performance?

I have a question regarding two specifications of RAM memory, the amount of Mhz and the latency timings (example: 9-9-9-24). Which one of the two is most important for system performance and why? Also what exactly is the difference between the two?
user62234
10
votes
4 answers

Fixing bufferbloat in home network

In our home network, with continuous network IO happening latencies get ridiculous. It's fine with light loads but quickly becomes unusable if I'm, say, rsyncing a large number of small files, --other transfers essentially stop. Pings get through…
cuu508
  • 432
10
votes
4 answers

High DPC latency Windows 10, unable to fix

Edit: I am still experiencing this issue. ndis.sys is causing issues and I have not been able to resolve it. I am at a loss of what to do. I have tried reinstalling windows AGAIN, reinstalling drivers and disabling throttling, nothing works. I've…
Sebastian Olsen
  • 634
9
votes
3 answers

Xeon vs overclocked i7 Extreme for lowest latency

I am aware that the differences between high-end i7 and Xeon are: compatibility with dual socket motherboards, total L2/L3 cache size. overclocking capability. extra cores - Haswell i7-4960X vs E7. power consumption. (See: What is the…
elleciel
  • 191
8
votes
2 answers

Can I run games smoothly on a server via RDP?

Is it possible to run games on a hosted server smoothly via RDP? I have a dedicated server running Windows Server 2012 R2. It has 144 GB of RAM, an Intel Xeon E5 and GeForce GTX 750 Ti GPU. It's a dedicated, hosted server so I have to connect to it…
Aarivex
  • 99
8
votes
2 answers

Calculating hard disk block model reading time

My professor posted a slide on how to calculate the data retrieval from hard disk using the block model. The specs were: 7200 RPM 5ms SEEK 80MB/s TRANSFER RATE BLOCK MODEL : Block size 4KB I don't understand how he did the following…
drum
  • 719
8
votes
2 answers

Very low latency streaming

I'm looking to stream a live lecture into an overflow lecture theater. I'm planning to stream HD content along with audio from a powerful server with nVidia GeForce GPUs connected to the client via a fiber connection (so hardware/network limitations…
Brad Morris
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