Throughput is the average rate of successfully delivered messages over a communication channel in a given amount of time.

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Path throughput estimation with one cooperating host only [closed]

I need a Linux tool that estimates throughput on a path where the host at the other end is not actively cooperating. This means that I can not use tools that establish a TCP connection. However, we ...
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1answer
67 views

NTttcp shows slower throughput on loopback (127.0.0.1) than on network

I am using NTttcp to find a baseline for what throughput I can expect between a client and server on windows. When I ran the client and server on two different machines on our LAN I got the following ...
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40 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
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1answer
79 views

Different throughput Ethernet-Wireless Wireless-Ethernet

I've built an open source implementation of RFC2544 to test IPv4 network devices. One of the first devices I tested is a wireless router D-Link 2640B. In order to measure its performance I use a ...
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38 views

Low WLAN throughput despite claimed fast connection

I have so following setup and suffering from low throughput and high latency and I have no clue why thats the case: Server (192.168.2.2) <--> AP (192.168.2.1) <--> Laptop (192.168.2.12) The ...
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1answer
68 views

Netcat UDP File Transfer Between Two Servers Times Out?

I'm testing file transfer speeds between two Red Hat servers that are connected to the same switch within the data center and I decided to use netcat to eliminate protocol overhead as much as ...
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2answers
71 views

Do several EBS drives really improve overall disk throughput?

On m3.xlarge instance (EBS Optimized – True) : There are two EBS disks: /mnt/data0, /mnt/data1 Single dd: dd bs=1M count=1024 if=/dev/zero of=/mnt/data0/test conv=fdatasync 1024+0 records in ...
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41 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 ...
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1answer
524 views

UDP bandwidth calculation based on packet size, request rate and latency [closed]

I need to estimate the bandwidth for a measurement application to be written that uses UDP. I have a good sense of the numbers but am not sure how to put them together. I checked a few throughput ...
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1answer
144 views

Low throughput on Debian + nginx/apache

On the same LAN/WAN I have a Windows server 2012 server running IIS 7.5 and a Debian (wheezy) server running Nginx 1.4.5. Both servers are connected to the same LAN/WAN. When I download a 10mb file ...
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69 views

Throughput decreases after MTU 5000

I am trying to test throughput between two computers directly connected through 1 Gb and testing with iperf. I am getting a throughput around 980Mbps when MTU is between 5000 and 5050, however it ...
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2answers
1k views

1.73 Gbps at best on an Amazon EC2 10 Gigabit instance?

When I test my own '10 Gigabit' instances (c3.8xlarge) with iperf I won't see transfer rates exceeding 1.73 Gbps. This is at least four times worse than what a blogger at scalablelogic reports where ...
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2answers
50 views

Estimate if the network throughput is reached

I have 2 processes communicating over TCP/IP as following: process A sends 20 KB of data to process B and after some calculations process B sends the response (2KB) back to A. When I run both ...
2
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1answer
743 views

CentOS Tuned Equivalent For Debian

Running a few systems, a few are Debian which have been great. I have on the CentOS boxes tuned(tuned-adm) installed and setup for throughput. I searched all over Google and only found some articles ...
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0answers
57 views

IIS6 poor throughput from higher latency

I've been having a crazy issue with Windows 2003 + II6 where the throughput goes down as the latency goes up. This is exactly the type of thing that TCP Window scaling is supposed to solve so I ...
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3answers
2k views

Lower TCP throughput from 1Gbps server than 100Mbps server over large RTT

We've got infrastructure distributed in a few major locations around the world - Singapore, London and Los Angeles. The RTT between any two locations is over >150ms. We've recently upgraded all of ...
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1answer
102 views

Why is my synchronized I/O so bad compared to direct?

I have two 3TB disks in a software RAID 1 setup and the host OS is 64bit Debian wheezy. Issuing: dd if=/dev/zero of=test bs=64k count=3k oflag=direct && rm test Yields: 201326592 bytes ...
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1answer
102 views

Ping measurements during throughput measurements

I have been measuring the throughput of file transfers from remote hosts and analysing the results, I understand about payload to overhead ratios, retransmission and other causational factors of ...
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1answer
185 views

100 Mb/s port limit reached or something else?

I have a dedicated server with a 100 Mbps port. A few times a week, there comes a time (usually in the evening hours) when there is an extremely high bandwidth usage, by far more than usual. I am on ...
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1answer
3k views

NFS client has unbalanced read and write speeds

I've got a NetApp as my nfs server, and two Linux servers as the nfs clients. The problem is that the newer of the two servers has extremely differing read and write speeds whenever it is doing read ...
2
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3answers
817 views

ZPOOL Mirror setup

What is the best setup for an zpool intended for database big inserts or TCP/IP dumps (i mean sustained high write throughput using 4 disks ? I want buy 4 Wd RE4 2TB drives and get the more power i ...
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2answers
187 views

How to diagnose network slowness between just two machines

I have a 1and1 Linux-based root server which I sometimes use to stream video to streaming video players at my house and at friends' houses. It has been working fine until a few days ago. Now, it ...
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1answer
201 views

Bandwidth * Delay Product

I'm trying to calculate the bandwidth delay product between various hosts, and reading this wiki article, I am confused. From the acticle; Residential ADSL2+: 20 Mbit/s (from DSLAM to residential ...
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1answer
270 views

What is the maximum theoretical throughput of a Thunderbolt + Mac Mini fileserver

Bounty 100 rep coming: I know I'm asking a lot here and I'd like a detailed/quality answer so, as soon as I am able, I'll be adding a 100 rep bounty to this question. I'm trying to illustrate the ...
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4answers
510 views

How do I reconcile Network Speed from Network Throughput?

I have been arguing with my ISP about the service they are providing; primarily with regard to throughput speeds. I have set up an edge router (see hardware details listed below) and on it I have ...
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1answer
951 views

How do mixed wireless clients (b/g/n) effect total throughput of an access point?

Say you are planning a network based around access points that support the full range of 802.11 protocols on 2.4Ghz(b/g/n). How will a mixed set of clients effect the total throughput possible through ...
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2answers
1k views

Virtual Machines on same ESXi 5 host: what kind of throughput should I expect?

Created a new vSwitch with no physical network adapters and no VLAN tags assigned to it. Left it at 120 ports as default, labelled it "Private Network". Added a "Flexible" network adapter to each ...
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1answer
2k views

Iperf from one interface to another on the same computer?

I need to test network throughput of a server to/from itself (it's a lonnnng story!). I love Iperf and use it across the network, but, I just can't figure out how to bind it to a single interface and ...
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1answer
139 views

Is throughput on higher bandwidth networks hindered by smaller UDP packet size?

I recently conducted an experiment on UDP throughput across 802.11g networks, using packet sizes between 100 and 1000 and bandwidths ranging from 6Mbps and 54Mbps. I have noticed that that higher ...
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2answers
367 views

Interconnected switches Slow throughput

I am in charge of a network of which a portion of it looks like this: One DLink DGS-1210-24 (1) as the main switch. One DLink DGS-1210-16 (2) connected with cat5e 250 feet away connected on (1) One ...
3
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1answer
1k views

Very low throughput on 10GbE network

I have two Linux machines, each equipped with a Solarflare SFN5122F 10GbE NIC. The two NICs are connected together with an SFP+ Direct Attach cable. I am using netperf to measure TCP throughput ...
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4answers
5k views

Cisco Get Current Interface Throughput

I can graph a device interface with SNMP tools, platforms like Cacti even make pretty graphs, but these are based on polling intervals (typically, every 5 minutes). I can use the CLI; r1>show int ...
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1answer
514 views

How to Benchmark an x86 Router?

How would one go about objectively benchmarking different x86 server for their potential as x86 routers? One idea I had is to setup two subnets, 10.0.0.0/24 and 10.0.1.0/24, on opposite sides of a ...
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4answers
501 views

Best performance: 1tb vs larger drives in app using only sequential read/writes

I have a custom app that is multi-threaded; each thread runs on its own logical core (the workstation is a dual xeon, with 12 physical and 24 logical cores). So there are 24 threads running ...
2
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1answer
171 views

Not understanding simultaneous connections, throughput when looking for a router/firewall appliance

I've recently decided to replace my Linux firewall/router with a more manageable appliance(better VPN, firewall, proxy). I've been searching the net for a good explanation of the significance of ...
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3answers
842 views

dell 2T 7.2k nearline SAS 6Gbps- ingress/egress throughput

I would like to know, how to calculate sustained read and write speeds supported. I don't have access to machine/drive, but need to define specs to purchase one. What all things would it be ...
0
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1answer
136 views

Amazon S3 as measure of server's throughput?

My server uses a 100Mbps shared port with 10Mbps nominal guaranteed BW. The highest speed of upload to Amazon S3 that I've seen from the server is 2.5MB/s. What does this indicate with respect to the ...
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6answers
11k views

Why does my gigabit bond not deliver at least 150 MB/s throughput?

I directly connected two PowerEdge 6950 crossover (using straight lines) on two different PCIe-adapters. I get a gigabit link on each of these lines (1000 MBit, full duplex, flow contol in both ...
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1answer
1k views

10 gigabit NICs showing only half the throughput

I have 2 physical servers: Two way Intel E5504 @ 2GHz, 24GB RAM, 12x32GB Intel X25-E SSDs in RAID10. Intel Core2 6400 @ 2.12GHz, 3GB RAM, simple 80GB SATA drive. Both machines run Windows Server ...
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3answers
4k views

How to check throughput (query per second) of a database?

I have PostgreSQL dbms. I want to check live throughput of the DBMS. I want to build a graph of throughput which will be updated every 10 seconds. How do I do that? Any suggestion for MySQL will ...
0
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1answer
293 views

TCPProbe logs not making sense

I am trying to use TCPProbe over my network to study TCP but the logs it is generating for a simple iperf TCP connection doesn't seem to make any sense. I am running an iperf over two nodes in my ...
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3answers
631 views

VOIP over Comcast causing problems

We're running a VOIP system over Comcast. The problems are: Some calls don't complete (both incoming and outgoing) Some phone calls get terminated in the middle of the call. I want to run some ...
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3answers
1k views

Disk throughput dramatically reduced when using ZFS on OpenSolaris?

I'm building a simple ZFS file server for the small business I work for. The server is a Dell Poweredge 840, with 1GB RAM. The OS (OpenSolaris 2009.06) is installed on one SATA drive, and there are ...
2
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2answers
472 views

nfs file access statistics

For a Linux NFSv3 server, is there any way to see statistics on actual file access? In other words, I would like to see a timestamped log of every file read or written. Motivation: I have several ...
2
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2answers
317 views

How do I know if my disks are being hit with too many I/O reads or writes or both?

I know a bit about disk I/O and bottlenecks relating to this especially when relating to databases. How do I really know what the max I/O numbers will be for my disks? What metric might be available ...
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2answers
152 views

MySQL sudden throughput increase

What could be the cause of a sudden increase in MySQL throughput (from an average of 1.5M/s to 7.5M/s). The system is running WordPress on a trafficked site (2M monthly pageviews). The throughput is ...
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5answers
4k views

How to measure disk throughput?

I want to know how many bytes per second can I write to the disk and read from it. How can I do that on linux machine?
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2answers
3k views

Measuring network throughput with netcat vs. CIFS/SMB transfer rates

I have been attempting to measure and benchmark our LAN's throughput as part of a larger project. Our LAN is constructed using cat5e and HP ProCurve 1800-24G switches which support 10/100/1000 Mbps ...
6
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2answers
5k views

What limits the performance of scp?

I've two Debian Linux machine connected via 1 Gbit LAN. I can measure this with a raw HTTP file transfer with wget which gets around 100MB/s in either direction. When I now use scp, the maximum ...
2
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2answers
7k views

How much horsepower is needed to have 100Mbit/sec OpenVPN throughput? [closed]

My small ALIX machine is not coping with the new demand for OpenVPN throughput I have. So I'm looking to replace it. Problem is, I don't have any experience with hardware sizing for OpenVPN. I'm ...