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

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236 views

Ping spikes in Windows 7

This is what my average latency looks like. Request timed out. Reply from 74.125.224.198: bytes=32 time=470ms TTL=53 Reply from 74.125.224.198: bytes=32 time=31ms TTL=53 Reply from 74.125.224.198: ...
2
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0answers
103 views

How to benchmark hard disk? [duplicate]

I am trying to benchmark my hard disk and find the throughput in Mb/s and latency in milliseconds. This is my code: public class OneMB implements Timer { public static void main(String a[]) throws ...
1
vote
1answer
560 views

What could cause wired internet latency to increase between wired users?

I have 3 roommates (4 people total). Three users, including me, use wired internet. The fourth uses wireless internet (connected to our network). During the evenings, they complain of high network ...
0
votes
1answer
202 views

Expected performance degradation when accessing ORDBMS within VM as opposed to natively?

Is there a significant increase in latency when accessing an ORDBMS (namely Oracle 11g) residing in the guest VM (from the host), as opposed to natively? The development environment will be used ...
0
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2answers
754 views

Any reason why Chrome would be loading pages much slower than Firefox? [closed]

I switch back and forth using Chrome and Firefox as my browsers. I've noticed lately that Chrome has taken awhile to load some pages even with just one tab open. Firefox doesn't do this, and loads ...
1
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2answers
377 views

Having trouble streaming music over my WLAN through iTunes and Apple TV

My wife recently purchased me Apple TV for Xmas and I am trying to set it up so it can access my music over a wireless network and I am experiencing network latency issues when trying to stream music ...
2
votes
3answers
5k views

Very high latencies with WiFi

We bought a new WiFi router / ADSL modem at home (Asus DSL-N55U-B) and the wifi connection occasionally has very high latencies (up to 20 seconds, versus most common 25 miliseconds when pinging google ...
3
votes
1answer
677 views

Increasing value of sched_latency_ns and sched_min_granularity_ns

Why do I get an error message when I try to increase the values of these two parameters: #cat /proc/sys/kernel/sched_latency_ns 1000000000 #echo 2000000000 > /proc/sys/kernel/sched_latency_ns ...
1
vote
1answer
941 views

Slow Gmail attachment download over HTTPS

It only affects Gmail. I have tested other HTTP, FTP and HTTPS websites and downloading is fine, at the exact same time the problem is affecting a Gmail attachment download. The symptoms include ...
1
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0answers
140 views

Wi-Fi very slow except for when another computer uses it

We recently moved to a new home in a new state, with a new ISP. I'm a software guy, and I work from home frequently through the vpn, so I ordered the fastest connection they have. Everything works ...
0
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2answers
72 views

Latency problems at different times of the day [closed]

I'm with Telstra, and basically when it's early in the morning I get 190 ping the average for me, but when it passes 11-12am the ping slowly raises, by 3pm I'm stuck with 300 ping and up, it doesn't ...
4
votes
2answers
561 views

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 ...
1
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0answers
203 views

Kernel tuning on Linux [closed]

I have heard about using operating systems where they "tune" the kernel. If they are bypassing the kernel, do they need to tune the kernel? Is it a case of they do both because whilst the network ...
2
votes
1answer
172 views

Microsoft Word 2003 - Debug loading times?

Loading new and most local documents is fast as hell, but a few specific documents can take up to 10 minutes to load, which is not acceptable. I know that these documents have macros enabled and ...
0
votes
2answers
351 views

Sustaining Dual Channel among many RAM modules

I'd like to know what are the factors that need to be set in order to sustain the Dual Channel mode. In a mobo with 4 DDR3 slots: Do I have to put pair of chips? Eg: If I put 3 identical chips ...
0
votes
1answer
675 views

How can I get Screen Sharing to perform well with heavy updates?

I am using Screen Sharing on the Macintosh OS X Lion to view a remote VNC server display. I have found that when I have a shell in emacs which has tons of text scrolling by, the Screen Sharing ...
-1
votes
2answers
316 views

How is it possible for SSD's drives to have such a good latency?

First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's ...
4
votes
3answers
2k views

Live Screencast under Linux

I was having some difficulty with running a Live Screencast under Linux. I've found jtvlc and tried using that, but whenever I use it the stream comes out either blank or lagged with extremely high ...
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0answers
113 views

Comcast connection

I have had Comcast for about a month and up until Friday I havent had one complaint. As of Friday I started noticing massive lag while playing Tera, which is a MMO. I started up a ping -t ...
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0answers
168 views

Which RAM configuration for a desktop upgrade?

I am trying to increase the RAM of my home computer, but I am unsure as to how much each aspect of RAM should be weighted (as to which is more important). My motherboard has 6 slots, so I believe it ...
2
votes
3answers
1k views

Memory, more frequency, or more capacity?

My question my be simple, but I haven't been able to find an answer myself yet. If you had the choice of getting either 24 GB of ram at 1333 MHz, or 12 GB @ 1600 MHz, which would you choose? I know ...
1
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0answers
182 views

Why do mobile networks have high latencies? [closed]

While Ethernet and WLAN typically have latencies on the order of 1-10ms, mobile networks (GPRS, UMTS etc.) have much higher latencies (200-400 ms for UMTS, even more for GPRS). Why is that? I assume ...
0
votes
1answer
397 views

High latency on wireless LAN

I have setup a LAN using AirPort. The nodes are Mac Minis. The OS is OS X Lion 10.7.3. The AirPort connects to the Internet using cable and the internal connection is wireless. I tried to ping each ...
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0answers
105 views

high latency on LAN

I have setup a LAN using mac airports and the nodes are macminis. The OS is Lion 10.7.3. the macport connect to the Internet using cable and the internal connection is wireless. I tried to ping each ...
16
votes
3answers
6k views

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 ...
0
votes
2answers
2k views

DSL vs Cable latency

currently I have a 10Mbps DSL line and I'm thinking to switch to a cable since they got 100Mbps for a little less than double the price I'm paying for 10Mbps. In other words the cable company is ...
6
votes
3answers
4k views

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 ...
2
votes
1answer
467 views

What is the best way to connect two Macs to minimize network latency?

What is the best way to connect two Mac Minis, one running Lion and the other one running Snow Leopard, to minimize latency for sharing screen? Right now they are connected through a wireless network ...
1
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2answers
2k views

Lowest Latency Sound Card

I'm using a sound card for reading analogue signals and for the ADC component. I need extremely low latency (<1ms). Is the sound card the right way to go or can you get better results with a custom ...
0
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0answers
398 views

Calculating DRAM Timing Parameters from Latency

Let's say that we're looking at a DRAM with typical timing parameters (those of interest are listed below) with read and write latencies of ~20-50 nanoseconds. How would one go about changing the ...
4
votes
2answers
2k views

How to solve extreme DPC latency peaks (240.000µs)

Once every few minutes I get a sudden peak of DPS latency that causes the system to "freeze" for a fraction of a second (240.000µs = 240ms). The freeze is not only audio, also video, input devices, ...
3
votes
1answer
549 views

Windows 7 Lagging with multiple disks

I have an EVGA SR2 build with two Intel Xeon X5680, 48GB ram OCZ Reaper HPC Series at 1600 MHz running on Windows 7 x64 Proffesional. My bootable hard drive is an OCZ Vertex II 120GB and I have an ...
0
votes
1answer
142 views

Recording a video game on a P4… speed me up, Scotty?

I'm trying to record a d3d game, but I have HUGE lag issues. I'm on a p4 with an onboard 128 MB 3D video card and 2 gigs of RAM. I'm trying to record quarter-size video with only 15 fps, but I'm still ...
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0answers
215 views

Is data transfer through a WPA2 protected ad-hoc network slower as compared to a unsecure one?

We play multiplayer LAN games on our laptops by creating wifi ad-hoc connection (sometimes protected to ensure no one other than whom we want to, joins in). Now my question is how much using a secure ...
5
votes
2answers
1k views

High packet loss - all hops show red

I've run Ping Plotter and here are the results with high packet loss on all hops (around 12%). I find hard to believe Google's routers are faulty, is it my network card to blame? Click the ...
1
vote
1answer
264 views

How much latency is introduced when the computer processes incoming network packets?

How much time does it take, from the time the data is received by the network card, until it is time stamped by the Linux kernel? Is it in microseconds? nanoseconds? How I can improve this latency? ...
13
votes
4answers
4k views

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 ...
1
vote
1answer
193 views

Extreme Latency on Brand New CPU?

I've recently picked up a Coolermaster HAF with an ASUS p8p67pro motherboard equipped with 8 gigs of ram while running on Windows 7. This thing is hardly a month old, and yet it runs like an old dog ...
6
votes
3answers
5k views

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 ...
3
votes
2answers
766 views

How to increase transfer speed on fat long pipe?

I have a log pipe between two facilities (gigiabit circuit with RTT latency of 17ms). When doing system-to-system file transfer (file sharing, rsync, ftp, sftp) I'm hitting maximum speed of approx 30 ...
3
votes
3answers
436 views

Windows 7 Network Mystery

I'm having serious connectivity issues in Windows 7 and I'm out of diagnostic ideas. Here's way too much detail: Machine is about 6 months old, haven't had a problem up until yesterday. Internet ...
2
votes
2answers
4k views

What's the minimum network latency for a 1000 km connection using optic fibers?

I know most of the network latency for short distances is due to router processing times. But for longer distances the speed of light also counts. And it's different from the speed the light in the ...
2
votes
1answer
109 views

Powerful monitoring applications for Windows

I have been using the Windows 7 Resource Monitor lately which has proven very powerful. One can see what disk latency any process produces and effectively disable it if not required. For example, I ...
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vote
3answers
3k views

Latency of WiFi router

My current gaming desktop is connected to router via few meters of class 5 UTP. But I have to move it to another room, and I'm reluctant to drill holes in the wall to get cables trough. Currently I ...
6
votes
3answers
1k views

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 ...
1
vote
1answer
699 views

high latency pings to router

I am using a wireless network, wondering why when pinging the router I sometimes get high pings. shouldn't the time be <1ms all the time?
4
votes
1answer
2k views

How to reduce latency with openssh?

I'm ssh-ing to a server several thousands kilometers away, and every keystroke takes 500-800ms, so it is getting annoying. Is it possible to have my ssh client cache each line I type locally and ...
4
votes
2answers
616 views

SSH and Latent Connections (e.g., satellite connections)

Most of the week I live in the city where I have a typical broadband connection, but most weekends I'm out of town and only have access to a satellite connection. Trying to work over SSH on a ...
0
votes
2answers
496 views

10 System LAN latency with ADSL modem as gateway

Recently I expanded LAN in my office from 3 to 10 computers. Structure star topology, one ADSL Modem connected to One Switch which is again connected to 10 computers. Also we have Wifi device ...
0
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0answers
455 views

Windows 7 Line In Delay Issue

I'm running Windows 7 Pro 32-bit on my Dell Latitude 2100 netbook and I'm having an issue with the line in device/driver/functionality. The device & driver are stock: Driver Date: 7/13/2009 ...