Tc command and IP tos in linux Post: 302581765

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Operating Systems Linux Red Hat Tc command and IP tos in linux Post 302581765 by chuikingman on Wednesday 14th of December 2011 03:41:07 AM

12-14-2011

Registered User

Tc command and IP tos in linux

Hi,
I use comand Tc to set the traffic control in linux box .
I use below command to set Qos , search TOS field equal to 0x2 and put it in first queue
other put in to third queue ..

tc qdisc add dev eth0 root handle 1: prio priomap 2 0 2 2 2 2 2 2 2 2 2 2 2 2 2 2

tc qdisc add dev eth0 parent 1:1 handle 10: pfifo limit 999999
tc qdisc add dev eth0 parent 1:2 handle 20: pfifo limit 999999
tc qdisc add dev eth0 parent 1:3 handle 30: pfifo limit 999999

I also set filter to check Tos =0x2 and put it in to queue 1 ...
tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32 \
match ip tos 0x2 0xff \
flowid 1:10

There is no error for commit the command
But when I generate the traffic with TOS=0x2 ,I use comamnd
tc -s qdisc ls dev eth0 to check the queue 1 (first, 10)traffic.
[root@localhost ~]# tc -s qdisc ls dev eth0
qdisc prio 1: bands 3 priomap 2 0 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sent 6960760 bytes 15785 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc pfifo 10: parent 1:1 limit 999999p
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc pfifo 20: parent 1:2 limit 999999p
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc pfifo 30: parent 1:3 limit 999999p
Sent 6945311 bytes 15751 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
[root@localhost ~]#

I cannot see the send packet increase.
I only see the traffic in queue 3 (third ,30 ) increase.
Even I use http or sftp, only queue 3 traffice incrase.
So, it seem the tc cannot filter for the packet mark TOS=0x2 and putit into queue 1...
So, any advice how to fix it ....???

chuikingman

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tc-pfifo_fast

PFIFO_FAST(8)							       Linux							     PFIFO_FAST(8)

NAME

       pfifo_fast - three-band first in, first out queue

DESCRIPTION

       pfifo_fast is the default qdisc of each interface.

       Whenever  an  interface	is  created,  the pfifo_fast qdisc is automatically used as a queue. If another qdisc is attached, it preempts the
       default pfifo_fast, which automatically returns to function when an existing qdisc is detached.

       In this sense this qdisc is magic, and unlike other qdiscs.

ALGORITHM

       The algorithm is very similar to that of the classful tc-prio(8) qdisc.	pfifo_fast is like three tc-pfifo(8) queues side  by  side,  where
       packets can be enqueued in any of the three bands based on their Type of Service bits or assigned priority.

       Not all three bands are dequeued simultaneously - as long as lower bands have traffic, higher bands are never dequeued. This can be used to
       prioritize interactive traffic or penalize 'lowest cost' traffic.

       Each band can be txqueuelen packets long, as configured with ifconfig(8) or ip(8).  Additional packets coming in are not enqueued  but  are
       instead dropped.

       See tc-prio(8) for complete details on how TOS bits are translated into bands.

PARAMETERS

       txqueuelen
	      The length of the three bands depends on the interface txqueuelen, as specified with ifconfig(8) or ip(8).

BUGS

       Does  not  maintain statistics and does not show up in tc qdisc ls. This is because it is the automatic default in the absence of a config-
       ured qdisc.

SEE ALSO

       tc(8)

AUTHORS

       Alexey N. Kuznetsov, <kuznet@ms2.inr.ac.ru>

       This manpage maintained by bert hubert <ahu@ds9a.nl>

iproute2							  10 January 2002						     PFIFO_FAST(8)