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

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10
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6answers
9k 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 ...
9
votes
3answers
1k 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 ...
6
votes
5answers
3k 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?
6
votes
2answers
4k 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 ...
6
votes
4answers
460 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 ...
6
votes
6answers
3k views

Expected throughput in Gigabit network

I've been doing some tests with iperf to measure the network throughput between 2 servers (connected back-to-back thru a crossover cable) and I only see 180 to 200 Mbps. I tried different cables and ...
4
votes
4answers
392 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 ...
4
votes
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 ...
3
votes
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 ...
3
votes
1answer
947 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 ...
3
votes
4answers
3k 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 ...
3
votes
1answer
180 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 ...
3
votes
2answers
526 views

Planning trunk capacity for multiple GbE switches [duplicate]

Without measuring throughput (it's at the top of the list; this is just theoretical), I want to know the most standard method for trunking VLANs on multiple Gigabit (GbE) switches to a core Layer 3 ...
3
votes
1answer
2k 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 ...
3
votes
1answer
352 views

Throughput; capacity planning help for C10K like design [duplicate]

I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity ...
2
votes
3answers
659 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 ...
2
votes
3answers
2k views

Issues with sustained traffic with PFSense

Last week we had to replace our PFSense firewall because it had a catastrophic hardware failure. All but one of the NICs were taken out of the old server and put into the new one. The one NIC that was ...
2
votes
2answers
335 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 ...
2
votes
2answers
47 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
votes
1answer
663 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 ...
2
votes
1answer
145 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 ...
2
votes
2answers
362 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
votes
2answers
6k 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 ...
2
votes
1answer
3k views

Debugging IO Limitation

I have a Fedora box with some severe IO limitations which I have no idea how to debug. The server has a Areca Technology Corp. ARC-1130 12-Port PCI-X to SATA RAID Controller with 12 7200 RPM 1.5 TB ...
2
votes
1answer
284 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 ...
2
votes
2answers
314 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 ...
1
vote
1answer
459 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 ...
1
vote
5answers
973 views

DMZ configuration and firewall throughput

I've been asked to look into placing a firewall between a webserver (Debian/Apache/PHP) in the DMZ and a backend MySQL database to achieve "isolation". Right now, iptables is running on the MySQL ...
1
vote
2answers
198 views

Max traffic - 1Mbps up

I was wondering how to calculate the maximum traffic/load that I could potentially serve having a 1Mbps up? I know that it depends also on external factors but roughly what would be the max output. ...
1
vote
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 ...
1
vote
1answer
670 views

Where would an S3 upload speed cap originate?

I do a ton of uploading to S3 and am experiencing capped speeds and I can't quite figure out how to address it. The setup: Windows Server 2008 R2 x64, external HD, using a Java based upload tool ...
1
vote
1answer
70 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 ...
1
vote
1answer
69 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 ...
1
vote
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 ...
1
vote
1answer
932 views

Throughput tool with decent graphing

I've been looking through some of the tools available for generating traffic to measure maximum network throughput, namely iperf, bwping, ttcp, etc. I am planning on doing throughput tests over a long ...
1
vote
0answers
17 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
vote
1answer
94 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 ...
1
vote
0answers
51 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 ...
1
vote
0answers
40 views

Where can I find guidelines for building a SQL Server machine specifically for DBCC CHECKDB work? [closed]

I'm working on defining specs for a new server to run DBCC CHECKDB scans on all databases in our portfolio (85 instances, 1300 DBs, 15 TB allocated). I have a custom application that copies dump files ...
1
vote
2answers
180 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 ...
1
vote
2answers
239 views

Finding throuput of CPU and Hardrive on Solaris

How do I find the throughput of a CPU and the hard disk on an OpenSolaris machine? Using mpstat or iostat? I'm having a hard time identifying the throughput if it is given at all in the commands ...
0
votes
3answers
439 views

small lan throughput test

My house is Cat6 cabled for ethernet. I want to do some speed measuring. Background: Below the stairs is a small server room for the router, DSL modem, a EEE-Box (ubuntu) and a LaCie-Nas used for ...
0
votes
1answer
159 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 ...
0
votes
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 ...
0
votes
2answers
389 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 ...
0
votes
1answer
131 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 ...
0
votes
3answers
635 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
votes
1answer
134 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 ...
0
votes
2answers
500 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 ...
0
votes
2answers
918 views

Cisco AS5505 - How reliable is the max-throughput

How reliable are the maximum Cisco throughput numbers from their specs? I am considering to use ASA5505 and I expect a constant load which is around 60-70 % of the specified maximum and peaks around ...