SliTaz Forum

new_u

Member

Registered: 2014-03-30

Posts: 93

iproute2 - tc

SliTaz 4.0

I installed the iproute2 package (has tc in it).

root@slitaz:/# tc qdisc

qdisc pfifo_fast 0: dev eth0 root refcnt 2 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1

however

root@slitaz:/# tc qdisc del dev eth0 root

RTNETLINK answers: No such file or directory

searching suggests that there may be some module(s) missing...

mojo

Administrator

Registered: 2011-03-29

Posts: 2,174

Re: iproute2 - tc

According to http://www.linuxfoundation.org/collaborate/workgroups/networking/netem

iproute2/tc/netem requires sch_netem module

No version of slitaz kernel is configured to build it.

http://hg.slitaz.org/wok-stable/file/0ee9a1d56ed3/linux/stuff/linux-2.6.37-slitaz.config#l901

#CONFIG_NET_SCH_NETEM is not set

change to

CONFIG_NET_SCH_NETEM=m

Build/install sch_netem

new_u

Member

Registered: 2014-03-30

Posts: 93

Re: iproute2 - tc

Thanks mojo. Judging by the description of netem, it doesn't seem to be a basic component? (I'm ignorantly guessing)

I'm trying a basic command that is supposed to delete the default qdisc

tc qdisc del dev eth0 root

I'm not sure why doing that would require "network emulation"?

http://www.tldp.org/HOWTO/html_single/Traffic-Control-HOWTO/

5.1. Kernel requirements

#

# QoS and/or fair queueing

#

CONFIG_NET_SCHED=y

CONFIG_NET_SCH_CBQ=m

CONFIG_NET_SCH_HTB=m

CONFIG_NET_SCH_CSZ=m

CONFIG_NET_SCH_PRIO=m

CONFIG_NET_SCH_RED=m

CONFIG_NET_SCH_SFQ=m

CONFIG_NET_SCH_TEQL=m

CONFIG_NET_SCH_TBF=m

CONFIG_NET_SCH_GRED=m

CONFIG_NET_SCH_DSMARK=m

CONFIG_NET_SCH_INGRESS=m

CONFIG_NET_QOS=y

CONFIG_NET_ESTIMATOR=y

CONFIG_NET_CLS=y

CONFIG_NET_CLS_TCINDEX=m

CONFIG_NET_CLS_ROUTE4=m

CONFIG_NET_CLS_ROUTE=y

CONFIG_NET_CLS_FW=m

CONFIG_NET_CLS_U32=m

CONFIG_NET_CLS_RSVP=m

CONFIG_NET_CLS_RSVP6=m

CONFIG_NET_CLS_POLICE=y

--------

netem isn't listed there. But I notice for instance CONFIG_NET_QOS=y wich is missing in my SliTaz config. (it's not even commented out)

Maybe the QoS switch is more important than netem? (again, just guessing)

mojo

Administrator

Registered: 2011-03-29

Posts: 2,174

Re: iproute2 - tc

I'm not sure why doing that would require "network emulation"?

http://www.linuxfoundation.org/collaborate/workgroups/networking/netem

If you run a current 2.6 distribution, (Fedora, OpenSuse, Gentoo, Debian, Mandriva, Ubuntu), then netem is already enabled in the kernel and a current version of iproute2 is included. The netem kernel component is enabled under:

Networking -->

   Networking Options -->

     QoS and/or fair queuing -->

        Network emulator

Netem is controlled by the command line tool 'tc' which is part of the iproute2 package of tools. The tc command uses shared libraries and data files in the /usr/lib/tc directory.

But I notice for instance CONFIG_NET_QOS=y wich is missing in my SliTaz config. (it's not even commented out)

Slitaz 4.0 is kernel 2.6.37

CONFIG_NET_QOS: QoS support

General informations

The Linux kernel configuration item CONFIG_NET_QOS:

prompt: QoS support

type: bool

depends on: CONFIG_NET_SCHED

defined in net/sched/Kconfig

found in Linux kernels: 2.6.0–2.6.14

new_u

Member

Registered: 2014-03-30

Posts: 93

Re: iproute2 - tc

Ah, OK. So CONFIG_NET_QOS is not an issue.

new_u

Member

Registered: 2014-03-30

Posts: 93

Re: iproute2 - tc

So I compiled sch_netem.ko, inserted it

lsmod

Module                  Size  Used by    Tainted: P

sch_netem               3904  0

and...tc doesn't work. It still gives the same error.

I actually built all the stuff in /home/slitaz/4.0/src/linux-2.6.37/net/sched

so I have a bunch of modules, which I'm thinking they all need to be installed? Where?

/lib/modules/2.6.37-slitaz/kernel/net/    ?

and then run depmod?

-----------

done. So I can modprobe all these

act_gact.ko     cls_flow.ko     em_nbyte.ko     sch_htb.ko

act_ipt.ko      cls_fw.ko       em_text.ko      sch_ingress.ko

act_mirred.ko   cls_route.ko    em_u32.ko       sch_multiq.ko

act_nat.ko      cls_rsvp6.ko    sch_atm.ko      sch_netem.ko

act_pedit.ko    cls_rsvp.ko     sch_cbq.ko      sch_prio.ko

act_police.ko   cls_tcindex.ko  sch_drr.ko      sch_red.ko

act_simple.ko   cls_u32.ko      sch_dsmark.ko   sch_sfq.ko

act_skbedit.ko  em_cmp.ko       sch_gred.ko     sch_tbf.ko

cls_basic.ko    em_meta.ko      sch_hfsc.ko     sch_teql.ko

and still tc gives the same errror message.