Hi Andy,
Am Montag, 8. Juli 2013, 22:27:03 schrieb Andrew Beverley:
> On Sat, 2013-07-06 at 18:23 +0200, maillinglistredcap@xxxxxx wrote:
> > Hi there,
> >
> > I'm new to this list and new to traffic control as well. I want to do some
> > traffic shaping on my home network and over the past few days I've
> > studied the subject quite a lot. Today I decided to some first
> > experiments on my network using the HTB queueing discpline which seems to
> > suit my purposes best. Well the first results were disappointing... most
> > likely due to my lack of knowledge.
> You're not sending any traffic into your single leaf class.
Yes, I'm aware of that. I posted only a part of my configurations to illustrate
the fact, that cburst settings are ignored. But maybe it's more useful if I
give the whole configuration.
My qdisc tree is as follows:
tc qdisc del dev eth0 root 2>/dev/null
tc qdisc add dev eth0 root handle 1: htb default 110
tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit cburst 1602b
tc class add dev eth0 parent 1:1 classid 1:10 htb rate 99780kbit
tc class add dev eth0 parent 1:1 classid 1:11 htb rate 220kbit
tc class add dev eth0 parent 1:11 classid 1:110 htb rate 180kbit ceil 220kbit
tc class add dev eth0 parent 1:11 classid 1:111 htb rate 40kbit ceil 220kbit
This tree is on a machine in my network that has only one NIC. There is also a
router on my network with a 224 kbit uplink internet connection. I run some
services on the machine (e.g. bittorrent) that tend to clog up my internet
connection. My approach is to direct all local traffic to the class with minor
ID 10. Other traffic should be handled by class 1:11. In this class I have two
subclasses. One for services were responsiveness is crucial ( classid 1:110)
and a class (classid 1:111) that should handle other traffic (e.g. bittorrent).
Here is my iptables configuration:
iptables -t mangle -N lantraffic
iptables -t mangle -A lantraffic -j CLASSIFY --set-class 1:10
iptables -t mangle -A lantraffic -j ACCEPT
iptables -t mangle -N wantraffic
iptables -t mangle -A wantraffic -o eth0 -p tcp -m length --length :64 -j
CLASSIFY --set-class 1:110
iptables -t mangle -A wantraffic -o eth0 -m owner --uid-owner torrent -j
CLASSIFY --set-class 1:111
iptables -t mangle -A wantraffic -j ACCEPT
iptables -t mangle -A POSTROUTING -o eth0 -d 192.168.2.0/24 -j lantraffic
iptables -t mangle -A POSTROUTING -o eth0 ! -d 192.168.2.0/24 -j wantraffic
However, these settings don't work as I intended. Most of the time loading
websites is very slow ( I also have privoxy running on the machine, so the
above qdiscs should apply to HTTP/S traffic on my network).
Here are my statistics after about 5 minutes of websurfing with the qdisc
active:
parzival traffic # tc -s class show dev eth0
class htb 1:11 parent 1:1 rate 220000bit ceil 220000bit burst 1599b cburst
1599b
Sent 7098894 bytes 20291 pkt (dropped 0, overlimits 0 requeues 0)
rate 151240bit 29pps backlog 0b 0p requeues 0
lended: 3784 borrowed: 0 giants: 0
tokens: -42215522 ctokens: -42215522
class htb 1:110 parent 1:11 prio 0 rate 180000bit ceil 220000bit burst 1599b
cburst 1955b
Sent 1383696 bytes 14676 pkt (dropped 0, overlimits 0 requeues 0)
rate 8616bit 11pps backlog 0b 0p requeues 0
lended: 14628 borrowed: 48 giants: 0
tokens: 68710977 ctokens: 69147340
class htb 1:111 parent 1:11 prio 0 rate 40000bit ceil 220000bit burst 1600b
cburst 8800b
Sent 5715198 bytes 5615 pkt (dropped 0, overlimits 0 requeues 0)
rate 142624bit 17pps backlog 0b 14p requeues 0
lended: 1879 borrowed: 3736 giants: 0
tokens: -129515223 ctokens: 219603486
class htb 1:1 root rate 100000Kbit ceil 100000Kbit burst 1600b cburst 1600b
Sent 27883416 bytes 37148 pkt (dropped 0, overlimits 0 requeues 0)
rate 389912bit 52pps backlog 0b 0p requeues 0
lended: 0 borrowed: 0 giants: 0
tokens: 118880 ctokens: 118880
class htb 1:10 parent 1:1 prio 0 rate 99780Kbit ceil 99780Kbit burst 1596b
cburst 1596b
Sent 20784522 bytes 16857 pkt (dropped 0, overlimits 0 requeues 0)
rate 238680bit 24pps backlog 0b 0p requeues 0
lended: 16857 borrowed: 0 giants: 0
tokens: 118860 ctokens: 118860
As stated above, websurfing was not very responsive most of the time. I don't
know the exact implications of the burst and cburst parameters but I noticed
that the cburst in class 1:111 is quite large (8800b). The rule of thumb for
cburst seems to be to choose it as close to MTU as possible (1500 in my case).
As far as I understand, a high cburst setting implies that the class can break
its ceil rate on the expense of its siblings and the higher the cburst the
longer the time the class can operate above its ceil rate. I was wondering if
this is the reason for the poor performance. Unfortunately, cburst settings
specified by me are simply ignored by tc and so I have no idea how to
investigate further :-(.
Cheers
redcap
--
To unsubscribe from this list: send the line "unsubscribe lartc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
