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0
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1answer
55 views

How do I optimize Windows disk I/O for high-latency throughput?

Let's say there are 25 processes each which want to read and index a large (say, 1GB) file. The hard drive may be capable of ~100MB/sec throughput, but the head movement and rotational latency ...
0
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0answers
23 views

Windows software raid0 giving bad performance

I have two Samsung SSD's in RAID0 mode. I measured their sequential read/write speeds first in RAID0 Hardware and they give around 1000 mbps but then I used two disks in RAID0 software from within ...
0
votes
1answer
32 views

Calculate the throughput of a processor in bits per second

Let's say for example you have an 64-bit 3.2 GHz processor with 8 MB of Cache. What is the theoretical and practical throughput as it would write to RAM (assuming there are no RAM bottlenecks)? Thank ...
0
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0answers
193 views

2 port 10Gbe NIC Performance half of expected

I'm having trouble getting my expected throughput of a Intel dual port 82599EB 10-Gigabit. I've tried many things and want to know if there's anything I could try that I've missed. My hardware ...
0
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0answers
42 views

Multipath tcp application-level performance measurement

I am working on a project related to Multipath tcp and I want to measure the goodput and the RTT at the application level. I don't want to use a traditional tool(netperf, iperf, ...) and I want to ...
1
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0answers
9 views

Measuring Throughput of Remote Mounts

Is there a way to measure the throughput of say a remotely mounted sshfs share or samba share over openvpn in a linux environment?
0
votes
1answer
107 views

Why are USB connectors different from RJ45/Ethernet connectors?

I note that USB cable and Ethernet cable (RJ45/Cat5/...) have the same function : to transmit data as fast as possible over a wire or a port that we can connect and disconnect. In their evolution they ...
0
votes
0answers
11 views

throughput approval of a wireless network in a formal way

I want to approve (or attest), in a serious way, the throughput that i can reach in different places of my wifi area. I know that this problem can resolve with a simple ftp file transfer, but i want ...
0
votes
1answer
76 views

Throughput decreases after MTU 5000

I am trying to test throughput between two computers directly connected through 1 GbE and testing with iperf. I am getting a throughput around 980Mbps when MTU is between 5000 and 5050, however it ...
0
votes
1answer
102 views

RDP ceases due to encryption error, but only over wifi

So I'm trying to figure out some problems I'm having with RDP. It fails repeatedly over wifi due with the message "Because of an error in data encryption, this session will end" It does not do ...
0
votes
2answers
2k views

Difference between bandwidth and actual speed ? [duplicate]

I leased a line from an ISP that offers me a bandwidth of 4mb/s.But I receive only a speed of 160 kbps when downloading files over internet.I found that the actual speed I receive is the ISP ...
2
votes
2answers
144 views

Keeping a slowish DSL connection responsive

I have a Linux box serving as a firewall/router for our home network. I live out in the boonies, so I have a relatively slow broadband connection: Downstream Rate 7616 Kbps Upstream Rate 512 ...
2
votes
1answer
401 views

Why is FTP (in-built in OS) faster in Linux than in Windows?

For a throughput testing through FTP, I used FTP server in Windows as well as Linux platform. But in Windows I got the speed around 18Mbps but in Linux I am getting the speed as 40-45Mbps, which is ...
2
votes
2answers
528 views

Throughput from devices on gigabit switch to gigabit router

I think this is a pretty simple question, but I wanted to either validate my thinking, or for someone to tell me I'm wrong. My router at home has 4 gigabit ports. So, obviously, each (supported) ...
1
vote
1answer
305 views

Memory speed: single and dual channel

I measured memory throughput of my computer with MemTest86+, and one result surprised me. I use DDR3-8500 (533 Mhz) modules. I have one 4 GiB and two 2 GiB. The timings seem to be 7-7-7-20 fixed by ...
0
votes
2answers
295 views

TCP Throughput versus Packet Loss

How does the packet loss rate affect the TCP throughput rate: throughput rate reduce exponentially with respect to loss increase or throughput rate reduces by the same amount as loss increase?
3
votes
1answer
208 views

How to estimate download/enumeration times in large USB trees?

I'm doing a system design in which many flash-memory devices are connected into a USB tree of hubs, and I need to estimate how long it will take for them all to do a download ... which is complicated ...
3
votes
3answers
8k views

Highest effective transfer rate on SATA II

Assuming I have a SATA III SSD drive that has a throughput of >500 MB/s. What is a reasonable estimate of the effective throughput on a SATA II controller? I know that SATA II has 3.0 GBit/s ...
2
votes
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 ...
0
votes
1answer
1k views

Gigabit Switch Is Slow In One Direction, Fast In Opposite Direction

I have a desktop and a laptop connected by a network switch. Both have Gigabit network cards. My old (Netgear) Fast Ethernet switch gives equal throughput in both directions for file copying ...
4
votes
2answers
1k views

How does the link speed affect TCP throughput? [closed]

Can someone explain to me how data is transmitted over a network using TCP/IP? Let's say I currently receive 500 Mbps of data over a 1 Gbps line right now. If I upgrade the line to 10 Gbps, would my ...
0
votes
2answers
162 views

Throughput and why do ISPs sell too much bandwidth? [closed]

I hope the question made sense how I worded it. :) I've been wondering, maximum theoretical bandwidth is measured as RWIN/RTT (Window size / round trip time) Wikipedia Calculate TCP throughput ...
2
votes
2answers
213 views

Why would I get slower uploads on a Windows machine than my Mac?

I have a proprietary app, written in Java, that uploads files to a server via multiple HTTPS POST requests. There's a Mac version and a Windows version. On the Mac, we easily get 3-5mbps upload ...
4
votes
3answers
6k views

Windows 7, download speeds drop to 0 kb/s and the download has to be restarted

My PC has an SSD as C: and a sata drive for D: The SSD is brand-new and so I have reinstalled Windows 7 64-bit. I have installed the latest network drivers from the motherboard manufacturer, in fact ...
2
votes
2answers
179 views

Is 802.11g speed affected by slow 802.11g devices?

In general, if I have a 802.11g AP and a client is connected at a speed of 22Mbps (as seen from the AP's administrative interface), will this affect the speed/throughput of other devices connected to ...
1
vote
2answers
400 views

Network speeds being report as 4x higher than actual in Windows 7 SP1

Ever since installing Windows 7 SP1, I have noticed that all programs that display my network transfer rate have been exactly 4x higher than they actually are. For example, when I download something ...
1
vote
4answers
3k views

Very slow usb 3.0 performance

I have a WD Passport 1tb drive, and a 3tb Seagate 3tb GoFlex drive; both are external, both are usb 3.0, and both are slow as molasses: the most I can get out of them is 30MBs. I've tried copying ...
2
votes
5answers
139 views

Sharing files between multiple computers?

At my school, we have 13 iMacs that we use to make our yearbook. Currently our school has some servers for us, but since we work with so many files ( thousands of pictures, most of which are ~3MB ) it ...
2
votes
1answer
645 views

TCP Throughput testing tools with ability to rate-limit?

I'm looking for test software that can generate test streams with the TCP/IP protocol, but limit the rate of the test data. For example, if using 100Mbps Ethernet, I would like to be able to generate ...
9
votes
2answers
7k views

Does 1 Gbit/s port in full-duplex mean 1 Gbit/s send and 1 Gbit/s receive?

I'm figuring out the best router for me based on their performance. When you have a 1 Gbit/s port in full-duplex, does that mean you can send 1 Gbit/s and receive 1 Gbit/s at the same ...
0
votes
1answer
952 views

Slow file sharing speed over LAN

I have two ASUS UL80 laptops and trying to copy files from one to another. I also have a Linksys router with WiFI on. The speed of a file transfer via router + LAN cable (or only the LAN cable) is ...
0
votes
1answer
1k views

Maximum throughput for a network switch for multiple simultaneous transfers between different ports

On a typical network switch each port runs at a designed maximum speed, eg: 100Mb/s But is there a limit to the maximum transfer rate between all ports of the switch at a given time? I am guessing ...
2
votes
3answers
1k views

Linux: Limiting data throughput (pipe) in bytes per second?

I was wandering if there is a Linux program that can limit data throughput of a pipe - in actual bytes per second?. From what I gather, applicable for the purposes would be bfr, however, it has ...
0
votes
2answers
851 views

Can I add a gigabit switch to my D-Link WiFi router for gigabit networking?

I currently have a D-Link DIR-628 router in my home network that I use for wifi and local networking. However, I am looking to upgrade to a gigabit network as the data transfer speed between my ...
1
vote
1answer
1k views

How do I increase wireless network throughput to above 4mb?

Router: Linksys WRT610N (Simultaneous Dual Band) PC: Windows 7 MAC: Snow Leopard Max transfer speed: 4mbytes/sec Other tidbits: Wireless connection strength: Good. Both signals above 85%. I find ...
6
votes
2answers
15k views

How seriously does cable length affect USB 3.0 transfer speeds?

Recently I've been thinking of upgrading my computer with some USB 3.0 ports. However, the problem is my computer is some ways away from my desk so that would mean I would need a long cable, ...
2
votes
2answers
4k views

internet bandwidth measurement?

How the internet speed is calculated, and how does it differ from other speed measurements (like CPU speed)? For example, what does it mean if somebody says, "my internet speed is 512"?
1
vote
0answers
718 views

Win7 -> Server 2008: Mapped drives take a long time to open

First, the configuration: I have a desktop and a laptop running Windows 7. I have a server running Windows Server 2008 Enterprise Edition. The workstation and server connect to the same Gigabit ...
4
votes
5answers
241 views

Upgrading from single core to dual core - Will throughput get doubled?

If i replace a single-core processor with a dual-core processor, Will it increase the throughput by two times ? If No, why throughput does not get doubled ?