search for: ttcp

...anXY <-> vbridgeXY <-> domU-eth0 That is: vlan''s are managed in the physical host (for better security). The setup is working, i.e. I can connect to/from domU-eth0 from hosts in the same vlan. The problem is: it seems I loose "many" packets. I''ve run "ttcp"[*] tests between: A)- 2 physical hosts on that vlan B)- physical and domU hosts on that vlan (here physical host is not the Xen server) Dom0 host is quite powerful... more than any physical host I''ve tried to connect to and is acting as the receiver in "ttcp" tests. The...

I''m trying to get picture from ethloop and gnuplot. But the output seems weird. I still do not know why and want some examples. Thanks in advance. --------------------------------- Do You Yahoo!? 注册世界一流品质的雅虎免费电邮 --0-1760319804-1107141989=:62961 Content-Type: text/html; charset=gb2312 Content-Transfer-Encoding: 8bit <DIV>I''m trying to get picture from ethloop and

...les of such ftp tests with varying block sizes, bidirectional transfers, destination files on RAID storage, and a mix of some system loading programs run independently and during the network performance testing. Also archived were a full complement of network tests with what looks like the original ttcp and possibly newer versions. These utilities looked like they would work on our CentOS 6 systems, but we did not find ttcp and the ftp tests failed. the piping from dd failed with a message indicating that: |dd was not a recognized file. We no longer have available CentOS systems with versions of...

Hi all, Here is my setup: Host1 ---> Router ----> Host2 When i run ttcp -t on Host1 while ttcp -r in Host2, the bandwidth that i can get is about 860 Kbytes/s, which is less than 7Mbps. But i am using NIC 10Mbps for all machines. Why is that so? Currently, i am experimenting with the example efcbq. I am using MGEN (a UDP traffic generator) to send 2 flows of tra...

I'm trying to rsync a 8TB data folder containing squillions of small files and it's taking forever (i.e. weeks) to get anywhere. I'm assuming the slow bit is check-summing everything with a single CPU (even though it's on a 12-core server ;-( ) Is it possible to do something simple like scp the whole dir in one go so they're duplicates in the first instance, then get rsync to

...lowing situation? * New client. Intel Core 2 Duo 6600 with 4GB memory, and Intel gigabit NIC. * New server. HP XW8400 with (currently) a single 5335 Xeon with 4GB memory, and integrated Intel gigabit. Running samba 3.0.25b, as included with CentOS (RHEL). * Netgear GS116 (gigabit) switch Using TTCP (on Windows PCATTCP) I get around 406Mbit/sec (50.75MB/sec) between the new client and new server. TTCP transfers random data between two computers, to purely test the network transfer rate -- not using either computer's hard drive whatsoever. This seems about right. From what I've read els...

Hi all, I need a little help, i am studing htb to control user bandwidth (download/upload) and I made a script as below to test. I am testing using ttcp tool from by linux box to other linux (192.168.200.51). my box <---- Linux = more than 128kbit mybot -----> Linux = get 128kbit But I want to control both ways, what am I missing? script: EXTIF=eth0 INTIF=eth1 TC=/sbin/tc DOWN=128 UP=64 IP=192.168.200.201 ################## # $TC qdisc de...

Hi, I have run into the following I bonded 6 NICs on my Cent OS server into a 600MB pipe. I use bond method 4 = dynamic Link aggregation. My Cysco Switch supports this apparently. However I only get increased bandwidth from my MAC by connecting via AFP. However when I connect via SMB I don't. I was told to change the sockect options to the following on my smb.conf file on my fileserver:

Last month Mark Williamson sent out a patch to unconditionally enable the trace buffer. I''d like to suggest that his patch be accepted and merged. I have performed some simple benchmarks to quantify the overhead associated with the trace buffer and calls, and found a negligable performance loss due to them. The actual number was .069%, and was gotten by timing a simple cpu-intensive

...affic can never go from P2.eth1, and all traffic only goes to P1.eth0. What P2.eth1 (16.119.144.33) did is broadcasting an ARP asking for the MAC address of 16.119.144.66, although I have specified the route to 16.119.144.64/30 is through gateway 16.119.144.32, as shown below. Similarly, when I use ttcp ("ttcp -t -s -n -T -v 200 16.119.144.66"), traffic can never go through P2.eth1. On the other hand, if I "ping -I eth1 16.119.144.66", the ping can go through P2.eth1, P1.eth0, P1.eth1, and to P3.teql0 with no problem. What''s wrong and how to fix it? In addition, how to...

...affic can never go from P2.eth1, and all traffic only goes to P1.eth0. What P2.eth1 (16.119.144.33) did is broadcasting an ARP asking for the MAC address of 16.119.144.66, although I have specified the route to 16.119.144.64/30 is through gateway 16.119.144.32, as shown below. Similarly, when I use ttcp ("ttcp -t -s -n -T -v 200 16.119.144.66"), traffic can never go through P2.eth1. On the other hand, if I "ping -I eth1 16.119.144.66", the ping can go through P2.eth1, P1.eth0, P1.eth1, and to P3.teql0 with no problem. What''s wrong and how to fix it? In addition, how to...

...wed On 07/31/2012 07:05 AM, Smithies, Russell wrote: > Is it possible to do something simple like scp the whole dir in one go so they're duplicates in the first instance, then get rsync to just keep them in sync without an initial transfer? > > Or is there a better way? I use tar and ttcp for an initial transfer: On the receiving end: ttcp -l5120 -r | tar xf - On the transmitter: tar cf - . | ttcp -l5120 -t name-of-receiver Note: The files are transmitted without encryption. I easily get 110 Mbytes/sec. on a gigabit connection. If you need encryption, and your transfer is CPU...

...n are those priorities used? Do I need to set other parameters or queues/classes as well? I tried to attach other queues than the default to the classes (prio for instance), but that didn''t help. The top level queue is a CBQ Maybe my method of testing is flawed? I use a program ''ttcp'' that continuously sends maximum size TCP packets to a given port. Thanks, Geert

The ISP that I do some occasional work for is planning to roll out a new and much faster Internet service, and as such they will be coming here on Monday to upgrade my connection so I can test and play with it for a few weeks before they roll it out for the general public. It would be convenient if I could set up a cron job that would run some sort of an upload/download speed test from me back to

This is my simple situation: I want to policy download and shape upload going through my router. It has two interfaces: eth0 (10.4.10.222/24 connected to LAN) and eth1 (172.16.0.1/24 connected to my laptop). My setup: [eth1] tc qdisc add dev eth1 root handle 1: htb default 999 tc qdisc add dev eth1 parent 1: classid 1:1 htb rate 1Mbit tc filter add dev eth1 protocol ip parent 1:0 prio 1 u32 match

Hi all, I have exchanged my Dell R610 in favor of a Sun Fire 4170 M2 which has 32 GB RAM installed. I am running Sol11Expr on this host and I use it to primarily serve Netatalk AFP shares. From day one, I have noticed that the amount of free RAM decereased and along with that decrease the overall performance of ZFS decreased as well. Now, since I am still quite a Solaris newbie, I seem to

Our site has been experiencing problems with Samba causing kernel panics under heavy use. We are running Mandrake 7.0 and Samba 2.0.6. We are no longer using the distro included with Mandrake - we actually downloaded the 2.0.6 release and recompiled. Downloading from Samba shares causes no problems - and downloads are frequent and heavy - but uploading similar amounts of data leaves a catatonic

http://www.psc.edu/networking/projects/hpn-ssh/ Mike Stevens and I just released a new set of high performance networking patches for OpenSSH 3.9p1, 4.0p1, and 4.1p1. These patches will provide the same set of functionality across all 3 revisions. New functionality includes 1) HPN performance even without both sides of the connection being HPN enabled. As long as the bulk data flow is in the

Hi: I am using a machine with the 2.4.26 kernel, and trying to compare the performance of the HTB qdisc with the HFSC one. I have the following simple script that allows me to have a video stream on port 1234 while it limits a ttcp UDP stream so that the video stream is unimpaired. #!/bin/bash tc qdisc add dev eth0 root handle 1: htb default 12 tc class add dev eth0 parent 1: classid 1:1 htb rate 30mbit ceil 30mbit tc class add dev eth0 parent 1:1 classid 1:10 htb rate 20mbit ceil 30mbit tc class add dev eth0 parent 1:1 cl...

Folks, I've noticed poor performance using sftp. If anyone has any advice on how to improve performance, I'd like to hear it. Test simply involved transferring a single 143MB MP3 file using defaults for all the program configs. The opensshd 3.0.2p1 server is used in all tests. Software: openssh suite 3.0.2p1 psftp (putty sftp client) latest dev snapshot pscp (putty scp client) latest