Questions tagged [throughput]

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Kubernetes - high variance in response times

We have setup Kubernetes single node and then multi-node cluster using kubeadm and we are experiencing performance issues. We have measured the response times and we are experiencing variation in ...
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40 views

Weird download speed behaviour from a computer connected via WDS bridging

I have a Linux computer connected via Ethernet to a TP-Link Archer C7 router configured as a WDS bridge, following this tutorial. The route connects to my home Wi-Fi Network and passes the uplink ...
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1answer
57 views

Limited Download Throughput on single Desktop PC

So I just moved into a new home and have been setting up the internet here, but it seems like my desktop does not like the new internet environment. Originally, I tested to see if it was the Ubiquiti ...
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1answer
121 views

Puzzling network throughput behavior to my home

I wonder if anyone can suggest why I see this puzzling behavior: When downloading something large to my home (via Comcast), I get very slow throughput (e.g. 12 Mbits/s). Then, if I start a speed test ...
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1answer
1k views

Linux tmpfs write speed slower than RAM speed

I have a HPE ProLiant DL360 Gen9 server, specs are: CPU: Intel Xeon 2 CPUs E5-2687W v3 @ 3.10GHz, 25MB L3 cache, 10 cores ea RAM: 8x 32GB PC4-17000 DDR4 2133MHz CAS-15 1.2V SDRAM DIMM (256 GB total) ...
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2answers
360 views

How to measure the current inter-VLAN routing throughput / utilization of Cisco L3 switches?

How can I determine the utilization of inter-VLAN routing throughput for Cisco Catalyst L3 switches?
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1answer
414 views

Difference in network utilization between single and multiple TCP connections

We know that the way (basic) TCP works is by starting with slow-start phase followed by a linear increase of congestion window (CWD). The CWD is adjusted according to network status. So once we ...
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2answers
323 views

Why is throughput speed determined by the end system with the slower throughput?

I have been researching throughput speed of packet transfers and have been confused about the total throughput from one end system to another. For example: say a server is sending a packet to a client ...
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1answer
4k views

Browsing speed is fast, but download speed is 0

I'm currently using Windows 10 and netcomm nb604n router. Problem: Web browsing on chrome/edge/firefox works fast, but my download speed from majority of websites start around 10kb/s and eventually (...
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1answer
4k views

How does my VPN improve my download speed?

For some reason, I was downloading something at 300kb/s. Then I turned my VPN on and the download speed jumped up to 1.3mb/s. Why is this? Is it because the VPN server reduces the jumps between me ...
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604 views

qemu: emulated nic is too fast

On archlinux, I started a VM with qemu emulating a rtl8139 network card by giving it the following parameters: -device rtl8139,id=nic0,netdev=tap0 -netdev tap,id=tap0,ifname=tap0 After booting the ...
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1answer
805 views

How does IPv6 affect throughput?

In order to upgrade throughput, somebody advised me to work on IPv6. How does it affect throughput?
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204 views

How can throughput be greater than the bandwidth? Is this a valid reason?

I asked this question on networking engineers but it was closed as off topic since it wasn't for professional application. Hope it fits better here. I'm studdying for the CISSP secuirty exam and a ...
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1answer
9k views

Synology read performance degrades with Jumbo Frames over 6000

Short Version My home network is pure gigabit with devices that all support jumbo frames up to at least ~9000 bytes. Increasing the MTU jumbo frame setting on the Synology to 6000 (bytes) increases ...
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4answers
7k views

What is the actual speed of SATA 3?

Google says it is running at 6Gb/s. The throughput is at 600MB/s. 600MB/s equals 4.8Gb/s. Does this mean that the bandwidth is 6Gb/s but the actual throughput is 4.8Gb/s ?
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1answer
181 views

Ethernet switch throughput

I'm not a network/hardware guy so please bear with me if I'm using the wrong vernacular in my question: My office recently upgraded our Internet from 50/10 Mbps to 150/20 Mbps. For this upgrade, we ...
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1answer
678 views

Why is different throughput using netperf?

I am using netperf on Windows OS, with two computers connected with cross-over cable. First PC is using a Realtek FE network controller, and second PC has a Realtek GBE controller. With the first PC ...
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2answers
3k views

How to determine throughput of a path between two hosts with multiple links

I saw similar questions while searching, so I thought this might be the most appropriate place to ask this question. I am unsure on how to calculate throughput of a data transfer path given ...
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1answer
36 views

Poor throughput to the internet but just fine locally.

I have a router (Linksys E4200) connected to the internet (via external modem) and connected to a Powerline (AV500) device. I have 2 computers connected as follows: Modem <-- 1GbE --> Router &...
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1answer
2k 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 ...
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1answer
2k 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 ...
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1k 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 ...
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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?
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1answer
2k 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 ...
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1answer
314 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 ...
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1answer
273 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 this ...
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2answers
9k 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 ...
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2answers
298 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 ...
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1answer
1k 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 ...
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2answers
1k 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) ...
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1answer
1k 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 ...
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2answers
786 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?
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1answer
393 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 ...
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3answers
39k 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 ...
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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 ...
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1answer
2k 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 ...
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2answers
2k 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 ...
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2answers
287 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 ...
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4answers
24k 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 ...
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2answers
205 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 ...
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2answers
721 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 ...
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4answers
4k 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 ...
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5answers
151 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 ...
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1answer
1k 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 ...
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2answers
38k 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 ...
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1answer
1k 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 ...
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1answer
4k 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 ...
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4answers
2k 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 ...
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2answers
1k 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 ...
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1answer
2k 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 ...