* how to change classful netem loss probability?
@ 2006-04-26 22:46 George Nychis
2006-04-28 1:18 ` [LARTC] " George P Nychis
0 siblings, 1 reply; 6+ messages in thread
From: George Nychis @ 2006-04-26 22:46 UTC (permalink / raw)
To: LARTC, netdev
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 limit 500
thorium-ini hedpe # tc -s qdisc ls dev ath0
qdisc netem 1: limit 1000 loss 1%
Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
qdisc xcp 10: parent 1:1 capacity 52734Kbit limit 500p
Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
thorium-ini hedpe # tc qdisc change dev ath0 root handle 1:0 netem drop 1%
RTNETLINK answers: Invalid argument
thorium-ini hedpe # tc qdisc change dev ath0 root netem drop 1%
RTNETLINK answers: Invalid argument
any ideas?
Thanks!
George
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [LARTC] how to change classful netem loss probability?
2006-04-26 22:46 how to change classful netem loss probability? George Nychis
@ 2006-04-28 1:18 ` George P Nychis
2006-04-28 17:24 ` Stephen Hemminger
0 siblings, 1 reply; 6+ messages in thread
From: George P Nychis @ 2006-04-28 1:18 UTC (permalink / raw)
To: George Nychis; +Cc: lartc, netdev
And if its not possible to change the probability, is there another method I can use instead?
> 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 limit 500 thorium-ini hedpe # tc -s qdisc ls dev ath0 qdisc
> netem 1: limit 1000 loss 1% Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
> qdisc xcp 10: parent 1:1 capacity 52734Kbit limit 500p Sent 0 bytes 0 pkts
> (dropped 0, overlimits 0) thorium-ini hedpe # tc qdisc change dev ath0
> root handle 1:0 netem drop 1% RTNETLINK answers: Invalid argument
> thorium-ini hedpe # tc qdisc change dev ath0 root netem drop 1% RTNETLINK
> answers: Invalid argument
>
> any ideas?
>
> Thanks! George _______________________________________________ LARTC mailing
> list LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
>
>
--
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [LARTC] how to change classful netem loss probability?
2006-04-28 1:18 ` [LARTC] " George P Nychis
@ 2006-04-28 17:24 ` Stephen Hemminger
2006-05-04 23:35 ` George P Nychis
2006-05-05 15:08 ` where i can find this netem patch? George Nychis
0 siblings, 2 replies; 6+ messages in thread
From: Stephen Hemminger @ 2006-04-28 17:24 UTC (permalink / raw)
To: George P Nychis; +Cc: George Nychis, lartc, netdev
Loss was broken, patch sent.
The following works now:
# tc qdisc add dev eth1 root handle 1:0 netem loss 20%
# tc qdisc add dev eth1 parent 1:1 handle 10: tbf \
rate 256kbit buffer 1600 limit 3000
# ping -f -c 1000 shell
1000 packets transmitted, 781 received, 21% packet loss, time 3214ms
rtt min/avg/max/mdev = 0.187/0.398/3.763/0.730 ms, ipg/ewma 3.217/0.538 ms
# tc qdisc chang dev eth1 handle 1: netem loss 1%
# ping -f -c 1000 shell
1000 packets transmitted, 990 received, 1% packet loss, time 2922ms
rtt min/avg/max/mdev = 0.187/2.739/3.298/0.789 ms, ipg/ewma 2.924/2.084 ms
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: how to change classful netem loss probability?
2006-04-28 17:24 ` Stephen Hemminger
@ 2006-05-04 23:35 ` George P Nychis
2006-05-05 15:08 ` where i can find this netem patch? George Nychis
1 sibling, 0 replies; 6+ messages in thread
From: George P Nychis @ 2006-05-04 23:35 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: lartc, netdev
where did you send this patch?
I don't think I ever got it
> Loss was broken, patch sent.
>
> The following works now:
>
> # tc qdisc add dev eth1 root handle 1:0 netem loss 20%
>
> # tc qdisc add dev eth1 parent 1:1 handle 10: tbf \ rate 256kbit buffer
> 1600 limit 3000 # ping -f -c 1000 shell
>
> 1000 packets transmitted, 781 received, 21% packet loss, time 3214ms rtt
> min/avg/max/mdev = 0.187/0.398/3.763/0.730 ms, ipg/ewma 3.217/0.538 ms
>
> # tc qdisc chang dev eth1 handle 1: netem loss 1% # ping -f -c 1000 shell
>
> 1000 packets transmitted, 990 received, 1% packet loss, time 2922ms rtt
> min/avg/max/mdev = 0.187/2.739/3.298/0.789 ms, ipg/ewma 2.924/2.084 ms
>
>
>
>
--
^ permalink raw reply [flat|nested] 6+ messages in thread
* where i can find this netem patch?
2006-04-28 17:24 ` Stephen Hemminger
2006-05-04 23:35 ` George P Nychis
@ 2006-05-05 15:08 ` George Nychis
2006-05-05 17:15 ` [Netem] " Stephen Hemminger
1 sibling, 1 reply; 6+ messages in thread
From: George Nychis @ 2006-05-05 15:08 UTC (permalink / raw)
To: netdev; +Cc: lartc, netem
Hi,
I need help finding this patch that Stephen made.
He sent me a patch, but i do not think its related to the patch that
solved this problem. I will include the patch he did forward to me at
the bottom.
However here is the problem, i even rtied his misspelling of change :)
thorium-ini 15849-tests # tc qdisc add dev ath0 root handle 1:0 netem
drop 0%
thorium-ini 15849-tests # tc qdisc add dev ath0 parent 1:1 handle 10:
xcp capacity 54Mbit limit 500
thorium-ini 15849-tests # tc qdisc change dev ath0 root handle 1:0 netem
drop 1%
RTNETLINK answers: Invalid argument
thorium-ini 15849-tests # tc qdisc chang dev ath0 root handle 1:0 netem
drop 1%
RTNETLINK answers: Invalid argument
thorium-ini 15849-tests # tc qdisc change dev ath0 root handle 1: netem
drop 1%
RTNETLINK answers: Invalid argument
here is the patch i was forwarded, but did not solve this problem:
--- linux-2.6.orig/net/sched/sch_netem.c
+++ linux-2.6/net/sched/sch_netem.c
@@ -167,7 +167,7 @@ static int netem_enqueue(struct sk_buff
if (count == 0) {
sch->qstats.drops++;
kfree_skb(skb);
- return NET_XMIT_DROP;
+ return NET_XMIT_BYPASS;
}
/*
I'd greatly appreciate any help solving the change problem.
Thanks!
George
Stephen Hemminger wrote:
> Loss was broken, patch sent.
>
> The following works now:
>
> # tc qdisc add dev eth1 root handle 1:0 netem loss 20%
>
> # tc qdisc add dev eth1 parent 1:1 handle 10: tbf \
> rate 256kbit buffer 1600 limit 3000
> # ping -f -c 1000 shell
>
> 1000 packets transmitted, 781 received, 21% packet loss, time 3214ms
> rtt min/avg/max/mdev = 0.187/0.398/3.763/0.730 ms, ipg/ewma 3.217/0.538 ms
>
> # tc qdisc chang dev eth1 handle 1: netem loss 1%
> # ping -f -c 1000 shell
>
> 1000 packets transmitted, 990 received, 1% packet loss, time 2922ms
> rtt min/avg/max/mdev = 0.187/2.739/3.298/0.789 ms, ipg/ewma 2.924/2.084 ms
>
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Netem] where i can find this netem patch?
2006-05-05 15:08 ` where i can find this netem patch? George Nychis
@ 2006-05-05 17:15 ` Stephen Hemminger
0 siblings, 0 replies; 6+ messages in thread
From: Stephen Hemminger @ 2006-05-05 17:15 UTC (permalink / raw)
To: George Nychis; +Cc: netdev, lartc, netem
On Fri, 05 May 2006 11:08:23 -0400
George Nychis <gnychis@cmu.edu> wrote:
> Hi,
>
> I need help finding this patch that Stephen made.
>
> He sent me a patch, but i do not think its related to the patch that
> solved this problem. I will include the patch he did forward to me at
> the bottom.
> However here is the problem, i even rtied his misspelling of change :)
>
> thorium-ini 15849-tests # tc qdisc add dev ath0 root handle 1:0 netem
> drop 0%
> thorium-ini 15849-tests # tc qdisc add dev ath0 parent 1:1 handle 10:
> xcp capacity 54Mbit limit 500
> thorium-ini 15849-tests # tc qdisc change dev ath0 root handle 1:0 netem
> drop 1%
> RTNETLINK answers: Invalid argument
>
The problem was you are giving handle 1:0 so the change request was
going to xcp. And xcp doesn't understand netem rtnetlink message.
You want to do:
# tc qdisc change dev ath0 root netem drop 1%
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-05-05 17:15 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2006-04-26 22:46 how to change classful netem loss probability? George Nychis
2006-04-28 1:18 ` [LARTC] " George P Nychis
2006-04-28 17:24 ` Stephen Hemminger
2006-05-04 23:35 ` George P Nychis
2006-05-05 15:08 ` where i can find this netem patch? George Nychis
2006-05-05 17:15 ` [Netem] " Stephen Hemminger
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