similar to: Please Help: applying multiple different delays with netem

Hi, I''m trying to set up 15 different delay intervals for packets leaving on an interface, using netems hanging off of a 16-band prio. I''m having trouble adding anything to bands higher than 10. Here''s what I tried: tc qdisc add dev eth0 root handle 1: prio bands 16 \ priomap 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I want all default traffic to go to

I''m trying to build a wan latency test environment, where packets from different "remote" locations get delayed by different amounts of time, depending on which remote location we''re pretending they are from. Currently, I''m doing this using the ''prio'' qdisc to obtain multiple bands, and hanging a different netem qdisc off each of the branches

I''m trying to setup a netem delay with no luck (using iproute2-2.6.8, compilation broke during arpd compile, so I use the tc binary in the tc/ subdir, there''s also a q_netem.so there). kernel is 2.6.8.1, compile with CPU cycle counter as time reference. I was using sch_delay of 2.6.7 happily with something like: tc qdisc add dev eth0 root 1: delay latency 1ms rate 35M now I use:

Hi, I am using netem to add loss and then adding another qdisc within netem according to the wiki. Then i want to change the netem drop probability without having to delete the qdisc and recreate it. I try it but I get invalid argument: thorium-ini hedpe # tc qdisc add dev ath0 root handle 1:0 netem drop 1% thorium-ini hedpe # tc qdisc add dev ath0 parent 1:1 handle 10: xcp capacity 54Mbit

Hi! We want to run TCP streams to several port numbers through one interface, each with a different delay set by Netem. E.g. TCP streams to port 80 could have 50ms delay, while TCP streams to port 81 could have 100 ms delay and so on. We have tried to solve this by using a combination of tc filter and netem rules, but we can''t get it quite right. We are considering one class per port,

Thanks in advance! Summary: when I load netem and teql together, teql doesn''t work correctly. (If I load teql only, everything is fine) I loaded both netem and teql. Netem is associated with eth0, and teql is associated with both eth0 and eth1. But traffic only goes out of eth1. Attached are the commands that I used to configure teql and netem (on machine 1), and commands to

Hi all, I''m running some tests with netem and I noticed some strange behaviour that looks like a bug: I''m pinging another machine and adding delay with netem. When I tell netem to give me a 10ms delay, it works fine. The problem is that when I ask for a 11ms delay, it gives me 20ms! It happens for any value between 11ms an 20ms, and it repeats for values over 20ms, now

The following (occuring on debian/testing with kernel-image-2.6.8-2-386 version 2.6.8-13 and iproute version 20041019-3) confuses me: # tc qdisc add dev eth0 root handle 1: prio # tc filter add dev eth0 parent 1: proto ip pref 1 handle 1 fw classid 1:2 # tc filter ls dev eth0 filter parent 1: protocol ip pref 1 fw filter parent 1: protocol ip pref 1 fw handle 0x1 classid 1:2 # tc filter del dev

hi i tried the example given on the examples page to duplicate selected traffic like tc qdisc add dev eth0 root handle 1: prio tc qdisc add dev eth0 parent 1:3 handle 3: netem duplicate 40% tc filter add dev eth0 protocol ip parent 1:0 prio 3 u32 match ip dst 11.0.2.2 flowid 1:3 when i ping from 11.0.2.2 to this interface my machine hangs. the same thing works for drop or delay. i would

I''m trying to simulate a satellite link to a Linux server to test application performance. I haven''t used any of the tc stuff before, but I blandly assured people it would be "easy" to set up a simulated long thin pipe on a spare network interface. However, now that I''m exploring, it''s proving quite difficult. Let me start with the general question

Hi all, I am currently trying to emulate a satellite link, via Netem, on a testbed which is OSPF-enabled. I''d like to set up a Netem box between two routers. Since all routing between routers is dynamic, I''m wondering how to set up OSPF on my Netem box? Could someone indicate me if it is feasible and give me some guidelines to possibly do so? Thanks in advance, Vincent.

Hi, I want to study the multi-path TCP behavior (single TCP connection over multi-paths), and I am setting up the test bed. I have two machines, each with two network cards. I have directly connected two eth0, and I am trying to figure out how connect two eth1 to control the properties of this connection, so that I can study the TCP on multiple different paths (different in terms of latency,

There is an design problem with the qdisc interface that causes qlen related bugs in netem, tbf, and other qdisc''s that peek at the top of the queue. The problem is that requeue needs to be called from the dequeue function but requeue can fail. If requeue fails, then the calling qdisc can not properly handle the error. If it returns NULL, then the parent''s expectation about qlen

Hi, I am using iproute2 to setup fowarding, adding routes like "ip route add 192.168.1.3 via 192.168.1.2" I was wondering where in the kernel I can insert probabilistic packet loss only for forwarded packets? So that for instance I can drop 5% of all forwarded packets? I don''t need help with the actual code, just need help finding where to insert this code :) Thanks! George

Hi all, I am trying to solve a tiny problem that is trivial to solve using dummynet (FreeBSD). I just want to add a delay of 50ms to each outgoing packet from an interface. This is to simulate a large pool of multiple modem users so I also need to add b/w limits etc (which seems to be easy to do). From the mailing list I could fine 2 qdiscs that can simulate latency : "delay" &

From: Willem de Bruijn <willemb at google.com> Vhost-net has a hard limit on the number of zerocopy skbs in flight. When reached, transmission stalls. Stalls cause latency, as well as head-of-line blocking of other flows that do not use zerocopy. Instead of stalling, revert to copy-based transmission. Tested by sending two udp flows from guest to host, one with payload of

From: Willem de Bruijn <willemb at google.com> Vhost-net has a hard limit on the number of zerocopy skbs in flight. When reached, transmission stalls. Stalls cause latency, as well as head-of-line blocking of other flows that do not use zerocopy. Instead of stalling, revert to copy-based transmission. Tested by sending two udp flows from guest to host, one with payload of

On Fri, Sep 29, 2017 at 3:38 PM, Michael S. Tsirkin <mst at redhat.com> wrote: > On Wed, Sep 27, 2017 at 08:25:56PM -0400, Willem de Bruijn wrote: >> From: Willem de Bruijn <willemb at google.com> >> >> Vhost-net has a hard limit on the number of zerocopy skbs in flight. >> When reached, transmission stalls. Stalls cause latency, as well as >>

On Fri, Sep 29, 2017 at 3:38 PM, Michael S. Tsirkin <mst at redhat.com> wrote: > On Wed, Sep 27, 2017 at 08:25:56PM -0400, Willem de Bruijn wrote: >> From: Willem de Bruijn <willemb at google.com> >> >> Vhost-net has a hard limit on the number of zerocopy skbs in flight. >> When reached, transmission stalls. Stalls cause latency, as well as >>

i wrote a C++ program that executes "tc" using the std::system call. this fairly reduces the performance if many tc calls are required. i want to be able to rename tc''s main function to tc_main and pass argv and argc. has someone done something like this? please let me know how i can compile for netem. thanks. __________________________________________________ Do You