Questions tagged [throughput]

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Why is USB-C full duplex?

USB-C has 4 data lanes. Two in each direction. My question is, why is this done? USB4, for example, is 40Gbps nominally, but only half those lanes are used if you are copying files to a disk. Use all ...
timl2k's user avatar
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122 views

How does my spinning HDD reach 320 MB/s?

While creating an image of a (mostly empty) 1TB spinning hard disk, I was expecting a read speed of around 120 MB/s, and on the first blocks it was like that, but after that, most of the time it was ...
golimar's user avatar
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1 answer
96 views

smartctl + how to found the XXX MBps throughput on disk

we want to know - How fast can a single storage volume read or write, in Megabytes per second for example - 125MBps throughput. so we used the smartctl command in order to capture the XXXMBps ...
King David's user avatar
0 votes
1 answer
113 views

iperf3 asymmetric throughput on Dell PowerEdge T110 II

Dell PowerEdge T110 II server (Broadcom BCM5722 using tg3 driver, Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz, Almalinux 8.5) has asymmetric iperf3 performance. When it is the server iperf3 tests at 940 ...
mathog's user avatar
  • 181
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1 answer
7k views

How to run iperf3 throughput test for multiple client interfaces on same machine?

I'm trying to run a throughput stress test from a machine that has multiple Ethernet interfaces to another machine with the same number of Ethernet interfaces. E.g. machine1.ethA.192.168.1.1 <-> ...
tarabyte's user avatar
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0 answers
618 views

How to make AWS EFS work fast? (looks like a bug)

I am copying (by DataSync) from one EFS to another EFS (both Provisioned (1024 MiB/s)) at 14.57 MiB/s. Both systems are in the same subnet in the US. (Moreover, when I tried to change them back to ...
porton's user avatar
  • 311
2 votes
1 answer
231 views

Why is SSD peak power drain higher for read than write?

The graphs on this page show that the Crucial MX500 SSD has a peak measured power draws of: Read - 2.4W Write - 2.0W Why would sustained random reads draw more power than sustained random writes?
Tom Hale's user avatar
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668 views

Manipulating MTU size in IPTables with mangle for use with OpenVPN

I am looking for any and all pointers in regards to modifying or resetting MTU size with the mangle table in iptables. Specifically where in the iptables flow is it more efficient to modify MTU to ...
mcv110's user avatar
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1 vote
1 answer
366 views

Why don't some top-end single-actuator disk drives use more than one head at a time to read or write data? [duplicate]

I was watching this talk [1] where two engineers from Seagate were presenting their findings of using their newly-developed MACH.2 multi-actuator drives [2] as part of ZFS pools. In some cases, they ...
Feuermurmel's user avatar
2 votes
1 answer
259 views

Bandwidth in communication and in physics... Faster WIFI speed?

While trying to increase the speed of my internet, I just realized how Bandwidth is understood differently in the networking world. That makes me kind of confused with why increasing a Wifi Bandwidth ...
Asians never die's user avatar
1 vote
0 answers
85 views

WAP: Throughput & MU-MIMO

I have several questions related to the behavior & throughput of a WAP, hope you can guide me in the right direction or give me some insights. I have a WAP (Unifi nanoHD), which is mainly aimed ...
CVXDEV's user avatar
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0 answers
79 views

Monitoring performance/throughput of USB-C

I've got a Lenovo laptop that supports USB type-c docking and I've got a Thunderbolt 3 docking station along. I know that this means that I'll only get the speed of USB 3.1 (gen 2). Hooking up two ...
Peter Lenkefi's user avatar
3 votes
1 answer
2k views

Slow rsync Transfer Speed over Wi-Fi on OpenWRT

I have a USB HDD successfully mounted on my Linksys WRT1900ACS (OpenWRT installed). Laptop is a macbook (MacOS). Both router and Mac have rsync 3.1.3 installed. File system on USB HDD is ext4. When ...
Mr. J's user avatar
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1 answer
110 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 ...
Kai's user avatar
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0 votes
1 answer
131 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 ...
BobDoolittle's user avatar
3 votes
1 answer
6k 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) ...
atreyu's user avatar
  • 362
-1 votes
2 answers
1k 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?
Approximator's user avatar
1 vote
1 answer
1k 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 ...
xavier666's user avatar
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2 answers
867 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 ...
Darien Springer's user avatar
1 vote
2 answers
13k 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 (...
Daniel's user avatar
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25 votes
1 answer
5k 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 ...
RazeLegendz's user avatar
1 vote
0 answers
1k 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 ...
jan's user avatar
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0 votes
1 answer
3k views

How does IPv6 affect throughput?

In order to upgrade throughput, somebody advised me to work on IPv6. How does it affect throughput?
Mehdi Alfaili's user avatar
1 vote
0 answers
226 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 ...
Celeritas's user avatar
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12 votes
1 answer
13k 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 ...
colithium's user avatar
  • 1,065
2 votes
1 answer
758 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 ...
Scott's user avatar
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1 vote
1 answer
986 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 ...
RockLegend's user avatar
2 votes
2 answers
6k 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 ...
sherrellbc's user avatar
0 votes
1 answer
41 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 &...
diolemo's user avatar
  • 133
1 vote
1 answer
4k 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 ...
Charles Burns's user avatar
0 votes
1 answer
4k 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 ...
Lee Sadler's user avatar
1 vote
0 answers
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 ...
Nate's user avatar
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1 vote
0 answers
29 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?
Scandalist's user avatar
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3 votes
1 answer
3k 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 ...
Malkio's user avatar
  • 31
0 votes
1 answer
374 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 ...
user3250247's user avatar
0 votes
1 answer
1k 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 ...
Sidney's user avatar
  • 1,307
0 votes
2 answers
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 ...
Ashildr's user avatar
  • 2,730
2 votes
2 answers
319 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 ...
Michael Lang's user avatar
2 votes
1 answer
2k 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 ...
Debapriya's user avatar
4 votes
2 answers
2k 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) ...
dark_perfect's user avatar
1 vote
1 answer
2k 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 ...
Gregory MOUSSAT's user avatar
0 votes
2 answers
862 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?
arun's user avatar
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3 votes
1 answer
444 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 ...
Wayne's user avatar
  • 131
12 votes
4 answers
53k 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 ...
ARF's user avatar
  • 711
2 votes
0 answers
104 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 ...
Prasanna's user avatar
  • 131
0 votes
1 answer
3k 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 ...
BZ1's user avatar
  • 381
4 votes
2 answers
3k 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 ...
eek's user avatar
  • 431
2 votes
2 answers
375 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 ...
Ben Werdmuller's user avatar
4 votes
4 answers
25k 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 ...
user avatar
2 votes
2 answers
221 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 ...
Shade's user avatar
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