Latency is the time difference between the start of an event and the time that the effects become noticeable.
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23 views
Fix for DirectX 7 latency on Windows 7? [migrated]
We have a piece of software that is programmed against DirextX 7 SDK (i.e the code uses LPDIRECTDRAWSURFACE7 and the likes) and runs in fullscreen. The main task is putting something on the screen in ...
0
votes
0answers
32 views
How to fight network latency and jitter issues on Wifi?
I'm having problems with my Wifi connection.
I did a test on PingTest.net with the following results:
Packet Loss: 0%
Ping: 103ms
Jitter: 29ms
Same test but from another machine on the network ...
3
votes
2answers
73 views
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 ...
0
votes
1answer
44 views
Troubleshooting “bursty” network traffic
I've been having a problem with my Internet connection ever since moving to San Francisco, and it's driving me absolutely up the wall. After using my network connection for anywhere between five and ...
4
votes
1answer
54 views
What can my ISP do? [closed]
I'm from India and customer service is extremely low priority in the agenda of companies here.
I use an ADSL connection and I want to know what my ISP can do on their side to improve my latency for ...
1
vote
0answers
39 views
alsaloop: What happens on a buffer underrun?
I am tuning my sound interface latency with
alsaloop -C hw:1,0 -P hw:1,0 -t $LATENCY_US
When I set $LATENCY_US to 30000, I get around 20% CPU usage.
I can restart this a few times and make some ...
5
votes
2answers
182 views
Alternating low and high ping times on ADSL line
I have an ADSL connection at home. Pings times are usually acceptable right after rebooting the modem, between 15 and 60ms to google.com. A few minutes later they go up to 900ms or even higher up to 3 ...
4
votes
3answers
228 views
Roommate lagging internet connection by watching videos from Chinese website. Can QoS fix issue?
My roommate is an international student from China and likes to watch Chinese TV shows online using a website based in that region (we're on the U.S. East Coast). But it causes our network's latency ...
0
votes
0answers
7 views
High latency/ping to local gateway WHILE STREAMING [wireless] [duplicate]
Recently I've become fed up with my wireless internet and want to identify the problem. I don't have a patch cord yet to test a direct connection but so far every computer I've tested has reported ...
0
votes
1answer
147 views
High latency/ping to local gateway WHILE STREAMING [wireless]
Recently I've become fed up with my wireless internet and want to identify the problem. I don't have a patch cord yet to test a direct connection but so far every computer I've tested has reported ...
0
votes
0answers
63 views
Chrome Experiencing High Latency and Low Download Speeds
In the last week, Chrome (latest version, 24.0.1312.57) on Windows 7 (64 bit) has severely deteriorated in download speeds and latency. Using speedtest.net, Chrome is currently receiving ~2.5mbps down ...
2
votes
2answers
112 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
votes
0answers
77 views
How to benchmark hard disk?
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
144 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
102 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
votes
2answers
203 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
vote
2answers
221 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
477 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 ...
2
votes
0answers
129 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
197 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
vote
0answers
72 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
votes
2answers
54 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 ...
3
votes
2answers
297 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
vote
0answers
106 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
107 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
161 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
307 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 ...
0
votes
0answers
47 views
surround sound on board upgrade for music creation
disclaimer - i'm not asking for shopping suggestions, just feasibility.
I'm thinking of getting a proper soundcard for my machine, but it's been a long long time since i've bought a dedicated card. I ...
1
vote
1answer
110 views
How do I speak with my ISP about network issues [closed]
Bottom Line
Star Wars the Old Republic is killing my network connection. I've sent traceroutes and ping results to my ISP but haven't managed to get the issue cleared up. I would like some help in ...
0
votes
0answers
172 views
How to reduce DNS server latency? [closed]
Which is the best practise to reduce DNS latency?
I'm using the beautiful powerdns DNS server, and i would like to lower down latency between internet client requests and the DNS server response.
I ...
-1
votes
2answers
244 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
1k 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 ...
0
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0answers
72 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 ...
0
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0answers
148 views
Wildblue Viasat Satellite Internet latency issue
I have the new 12Mbit/sec Wildblue/Exede broadband internet service. I'm trying to figure out ways to reduce the latency. Is there Any way I could use DSL for the tcp requests and then use the ...
0
votes
0answers
121 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 ...
1
vote
3answers
577 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
vote
0answers
113 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
272 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 ...
1
vote
0answers
85 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 ...
14
votes
3answers
2k 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
799 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 ...
4
votes
3answers
975 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
355 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
vote
1answer
1k 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
votes
0answers
209 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
713 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
377 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
76 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 ...
1
vote
0answers
188 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
489 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 ...
