search for: iperf

...r discussion with me >> that he'd like to do some throughput testing, but he's new to >> Linux/RedHat. Is there any software I can recommend to him that any >> of you find above par for CentOS 6/7? >> >> Thanks! >> >> Gilbert > > I've used iperf a lot successfully. I have an RPM for EL6 on my repo here: > > https://alteeve.ca/an-repo/el6/RPMS/x86_64/iperf-2.0.5-11.el6.anvil.x86_64.rpm > > The source is there, and I would be surprised if it didn't build > easily on EL7. > > https://alteeve.ca/an-repo/el6/SRPMS/iperf...

When starting IPERF with "iperf -s" or "iperf -sD" it seems to stop after client runs its first test. I would like to leave it running for a few hours to give someone a chance to run a few tests. Is there a way to leave it active on the server and kill it manually later?

I set up a domU as a backup server, but it has very, very poor network performance with external computers. I ran some tests with iperf and found some very weird results. Using iperf, I get these approximate numbers (the left column is the iperf client and the right column is the iperf server): domU --> domU 1.77 Gbits/sec (using 127.0.0.1) domU --> domU 1.85 Gbits/sec (using domU eth0 IP address) dom0 --> domU 91.5...

I set up a domU as a backup server, but it has very, very poor network performance with external computers. I ran some tests with iperf and found some very weird results. Using iperf, I get these approximate numbers (the left column is the iperf client and the right column is the iperf server): domU --> domU 1.77 Gbits/sec (using 127.0.0.1) domU --> domU 1.85 Gbits/sec (using domU eth0 IP address) dom0 --> domU 91.5...

Hello I was testing HTB using IPerf TCP traffic and the results were very good. Until I tried to add some UDP traffic the results were a little strange. this is my setup tc qdisc del dev eth1 root tc qdisc add dev eth1 handle 1:0 root htb default 2 tc class add dev eth1 parent 1:0 classid 1:1 htb rate 1mbit tc class add dev eth1 p...

...24 subnet (Since Node1:eth0 and Node1:eth1 are attached to bridges, they do not have IP addresses on them and are not ping''able) At Node0:eth0, I set the next hop of all traffic as Node1:DomU:eth0 and at Node2, I set the next hop of all traffic as Node1:DomU:eth1. Now, I try to run an Iperf server at Node2 for UDP traffic (const 64-byte packets size): iperf -s -i 2 -l 64 -u and an Iperf client at Node0 for UDP traffic to node2:eth0 (const 64-bit packet size, vary the Bandwidth from 10Mbps till possibly 80Mbps) iperf -c <IP address of Node2:eth0> -u -l 64 -t 90 -i 2 -w 256k -b...

...(x86) with GPL PV driver 0.9.9 ipferf 1.7.0 (from 2003) -dom0 a opensuse 11.0 xen: # rpm -q -a |grep -i xen kqemu-kmp-xen-1.3.0pre11_2.6.25.5_1.1-7.1 kiwi-desc-xenboot-2.38-67.1 xen-3.2.1_16881_04-4.2 xen-tools-3.2.1_16881_04-4.2 xen-libs-3.2.1_16881_04-4.2 kernel-xen-2.6.25.9-0.2 iperf 2.0.4 -1 interface as trunk on dom0, with some vlans''s and xen bridges -1 test machine in same subnet as the domU windows 2003 server. iperf 2.0.4 test: 1) on testmachachine: iperf -c <domU-IP> -p 2000 on domU iperf.exe -s -p 2000 gives great performance, about 850Mbit/s 2)...

Is there any piece of software that I can use to run between a client and a linux or windows server with a smb/cifs share that will test network speed, latency, sustained read/writes, multiple file create, read, write, close, etc.. etc.. over X period time? I'm testing a Centos server with samba and Windows 2k3/8 servers on the other end of a T1 connection and while I know the T1 bandwidth

...queues=4 > > > > -device virtio-net-pci,netdev=hn0,id=nic1,mq=on,vectors=10 > > > > > > > > In a guest I ran "ethtool -L eth0 combined 4" to enable multiqueue. > > > > > > > > I am running one tcp stream into the guest using iperf. Since there is > > > > only one tcp stream I expect it to be handled by one queue only but > > > > this seams to be not the case. ethtool -S on a host shows that the > > > > stream is handled by one queue in the NIC, just like I would expect, > > > >...

...queues=4 > > > > -device virtio-net-pci,netdev=hn0,id=nic1,mq=on,vectors=10 > > > > > > > > In a guest I ran "ethtool -L eth0 combined 4" to enable multiqueue. > > > > > > > > I am running one tcp stream into the guest using iperf. Since there is > > > > only one tcp stream I expect it to be handled by one queue only but > > > > this seams to be not the case. ethtool -S on a host shows that the > > > > stream is handled by one queue in the NIC, just like I would expect, > > > >...

I have a Dell server with four bonded, gigabit interfaces. Bonding mode is 802.3ad, xmit_hash_policy=layer3+4. When testing this setup with iperf, I never get more than a total of about 3Gbps throughput. Is there anything to tweak to get better throughput? Or am I running into other limits (e.g. was reading about tcp retransmit limits for mode 0). The iperf test was run with iperf -s on the server, and iperf -c server on four clients c...

Hi List. First post, be gentle please. Is there any limit in the linux UDP rate? I am using linux kernel 2.6 and iperf to measure bandwidth between two endpoints connected by 100 Mbits ethernet. Running (as root) iperf -u -s and iperf -u -c always gives me 1.05 Mbits/seg even when runned in the same machine. Can somebody clarify this? Thanks in advance. Sebastian

...with CBQ shaping and am facing a few problems. Can any of you please help? TEST SETUP: +---------------+ +----------------+ | 10.0.0.103 |----------->| 10.0.0.102 | +---------------+ +----------------+ 10.0.0.103: Linux, 100Mbit/s NIC 10.0.0.102: Windows, 100Mbit/s NIC, iperf tcp server (ports 2000 and 2001) WHAT I WANT TO DO: 1. Traffic from 10.0.0.103 to 10.0.0.102 port 2000 should always receive at least 60Mbit/s regardless of presence of other traffic. 2. In the absence of traffic to 10.0.0.102 port 2000, all other traffic should use all available bandwidth CBQ S...

Hi I am developing Window pv network driver and hit a problem now. My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM with 1 VCPU on a same server, iperf performance is OK between those two VM, but there is performance degradation between those 2 VM when i increase VCPU from 1 to 2. This problem occurs in QEMU mode too. Does Xen 3.1.4 has such problem or anything wrong in my configure file? My configure file is as following: acpi = 1 apic = 1...

...+ +----+-----+ +----+---+ | | +------+tap dev | | veth A +---------+ veth B | | | | +--------+ +----------+ +--------+ | | iperf -s<---------------------------------------------------------------------------+iperf -c | | | | | | | +------------------+ | | |...

...213], length 1448 Is the packet on transfer from netback to net front is segmented into MTU size? Is GRO not supported in the guest? I am seeing extremely low throughput on a 10Gb/s link. Two linux guests (Centos 6.4 64bit, 4 VCPU and 4GB of memory) are running on two different XenServer 6.1s and iperf session between them shows at most 3.2 Gbps. I am using linux bridge as network backend switch. Dom0 is configured to have 2940MB of RAM. In most cases, after a few runs the throughput drops to ~2.2 Gbps. top shows that the netback thread in dom0 is having about 70-80% CPU utilization. I have chec...

Just reporting some iperf results. In each case, Dom0 is iperf server, DomU is iperf client: (1) Dom0: Intel Core2 3.16 GHz, CentOS 5.2, xen 3.0.3. DomU: Windows XP SP3, GPLPV 0.9.12-pre13, file based. Iperf: 1.17 Gbits/sec (2) Dom0: Intel Core2 2.33 GHz, CentOS 5.2, xen 3.0.3. DomU: Windows XP SP3, GPLPV 0.9.12-pr...

...> > > > >>>>>> > > > > > In a guest I ran "ethtool -L eth0 combined 4" to enable multiqueue. >>>>>> > > > > > >>>>>> > > > > > I am running one tcp stream into the guest using iperf. Since there is >>>>>> > > > > > only one tcp stream I expect it to be handled by one queue only but >>>>>> > > > > > this seams to be not the case. ethtool -S on a host shows that the >>>>>> > > > > &gt...

...> > > > >>>>>> > > > > > In a guest I ran "ethtool -L eth0 combined 4" to enable multiqueue. >>>>>> > > > > > >>>>>> > > > > > I am running one tcp stream into the guest using iperf. Since there is >>>>>> > > > > > only one tcp stream I expect it to be handled by one queue only but >>>>>> > > > > > this seams to be not the case. ethtool -S on a host shows that the >>>>>> > > > > &gt...

Hello everyone, A network engineer buddy of mine brought up for discussion with me that he'd like to do some throughput testing, but he's new to Linux/RedHat. Is there any software I can recommend to him that any of you find above par for CentOS 6/7? Thanks! Gilbert ******************************************************************************* Gilbert Sebenste