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

PBFIFO(8)                                                              Linux                                                             PBFIFO(8)

NAME

       pfifo - Packet limited First In, First Out queue

       bfifo - Byte limited First In, First Out queue

SYNOPSIS

       tc qdisc ... add pfifo [ limit packets ]

       tc qdisc ... add bfifo [ limit bytes ]

DESCRIPTION

       The  pfifo and bfifo qdiscs are unadorned First In, First Out queues. They are the simplest queues possible and therefore have no overhead.
       pfifo constrains the queue size as measured in packets.  bfifo does so as measured in bytes.

       Like all non-default qdiscs, they maintain statistics. This might be a reason to prefer pfifo or bfifo over the default.

ALGORITHM

       A list of packets is maintained, when a packet is enqueued it gets inserted at the tail of a list. When a packet needs to be  sent  out  to
       the network, it is taken from the head of the list.

       If the list is too long, no further packets are allowed on. This is called 'tail drop'.

PARAMETERS

       limit  Maximum  queue  size. Specified in bytes for bfifo, in packets for pfifo. For pfifo, defaults to the interface txqueuelen, as speci-
              fied with ifconfig(8) or ip(8).  The range for this parameter is [0, UINT32_MAX].

              For bfifo, it defaults to the txqueuelen multiplied by the interface MTU.  The range for this parameter is [0, UINT32_MAX] bytes.

              Note: The link layer header was considered when counting packets length.

OUTPUT

       The output of tc -s qdisc ls contains the limit, either in packets or in bytes, and the number of  bytes  and  packets  actually  sent.  An
       unsent and dropped packet only appears between braces and is not counted as 'Sent'.

       In  this example, the queue length is 100 packets, 45894 bytes were sent over 681 packets.  No packets were dropped, and as the pfifo queue
       does not slow down packets, there were also no overlimits:

       # tc -s qdisc ls dev eth0
       qdisc pfifo 8001: dev eth0 limit 100p
        Sent 45894 bytes 681 pkts (dropped 0, overlimits 0)

       If a backlog occurs, this is displayed as well.

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                                                        PBFIFO(8)