[Cerowrt-devel] Torrents are too fast

Fri Nov 21 07:04:35 EST 2014

hm, it looks like somebody is still maintaining the l7-protocols package in
openwrt ->
https://github.com/openwrt/packages/blob/5600fdeeeec861c0359d6d53d1a1518b1817630d/net/l7-protocols/Makefile
https://github.com/gwlim/wr1043nd-chaos-calmer-patch/blob/master/openwrt-patch/037-fix-l7-filter.patch

2014-11-21 12:51 GMT+01:00 Sebastian Moeller <moeller0 at gmx.de>:

> HI Dane hi Dave,
>
>
> On Nov 20, 2014, at 17:25 , Dane Medic <dm70dm at gmail.com> wrote:
>
> > Thank you for advice Dave. I'm just looking around how to set-up layer 7
> inspection, I've also found this ->
> http://luci.subsignal.org/trac/browser/luci/trunk/contrib/package/freifunk-p2pblock?rev=
> > It would be very nice if someone could "merge" this with simple.qos, I
> don't really know how, yet.
>
> See the last comment in https://dev.openwrt.org/ticket/8590 it seems that
> L7 filters are on the way out in openwrt. If I understand correctly L7 does
> regular expression search of each packet (which are documented as not
> perfect and potentially slow), I would not be amazed if that would be
> really costly on your wndr. You might be “saved” though by your slow link
> ;) .  Also L& filters doe not really work with encrypted packets, so a
> malicious (actually mischievous would be enough) torrent client could mask
> its packets out of the filter match by encryption.
>
>
> >
> > 2014-11-20 15:40 GMT+01:00 Dave Taht <dave.taht at gmail.com>:
> > I would be surprised if you could tolerate a *single* big download
> > while watching a movie, at 4mbit/512k, much less torrents, which are 6
> > or more.
> >
> > That said, most torrent clients are configurable in several ways.
> >
> > 1) You can limit the number of download flows to something far less
> > than 6. Try 1 or 2.
> >
> > 2) You can typically rate limit them in the client to a lower rate
> > during the day and a higher rate at night.
> >
> > 3) You can tell them to mark the torrents as background (QoS marking
> > CS1), but that only helps on uploads vs the simple.qos script.
>
>         I think this is the best approach to take, actively configure the
> torrent client to be a good citizen...
>
> >
> > At the router itself, you can try things like identifying torrent
> > traffic via a consistent port number (if you have one) to toss it into
> > the background queue , or try qos-scripts which has a layer 7 dpi
> > tool.
>
>         If you have just a single torrent application you are concerned
> with you could capture a few incoming and outgoing packets and see whether
> you can find a “signature” for these packets in the data and then create
> “tc filter” invocations just against your specific torrent application…
>         I fear there is no automatic solution that will get all this
> right, and hence the prudent way would be for SQM to use the background
> queue as the default queue for everything (instead of the best effort
> queue) and then selectively promote reasonable traffic to the other queues.
> (But that means everything not classified will share a queue /suffer with
> the torrents until special cased by a promotion rule).
>
>
> Best Regards
>         Sebastian
>
> >
> >
> >
> >
> > On Thu, Nov 20, 2014 at 6:13 AM, Dane Medic <dm70dm at gmail.com> wrote:
> > > dpreed, thank you for response. I'm already using fq_codel with
> cerowrt and
> > > I don't think it does what I want (or maybe I want too much :)
> > >
> > > So the steps I've made:
> > > flashed wndr3700v2 with cerowrt 3.10.50-1 then I've measured:
> > >
> > > root at cerowrt:/usr/lib/CeroWrtScripts# sh betterspeedtest.sh -p
> wlan-si.net
> > > -t 120
> > > 2014-11-20 12:18:34 Testing against netperf.bufferbloat.net (ipv4)
> with 5
> > > simultaneous sessions while pinging wlan-si.net (120 seconds in each
> > > direction)
> > >
> .........................................................................................................................
> > >  Download:  3.78 Mbps
> > >   Latency: (in msec, 119 pings, 0.00% packet loss)
> > >       Min: 13.077
> > >     10pct: 251.522
> > >    Median: 317.851
> > >       Avg: 308.497
> > >     90pct: 371.033
> > >       Max: 376.132
> > >
> ............................................................................................................................
> > >    Upload:  0.48 Mbps
> > >   Latency: (in msec, 103 pings, 0.00% packet loss)
> > >       Min: 12.278
> > >     10pct: 12.727
> > >    Median: 18.359
> > >       Avg: 23.256
> > >     90pct: 33.971
> > >       Max: 180.303
> > >
> > > Then I've put these commands:
> > >
> > > uci set sqm.ge00.enabled=1
> > > uci set sqm.ge00.download=3200
> > > uci set sqm.ge00.qdisc=nfq_codel
> > > uci commit sqm
> > > reboot
> > >
> > > And another measure:
> > >
> > > root at cerowrt:/usr/lib/CeroWrtScripts# sh betterspeedtest.sh -p
> wlan-si.net
> > > -t 120
> > > 2014-11-20 12:49:05 Testing against netperf.bufferbloat.net (ipv4)
> with 5
> > > simultaneous sessions while pinging wlan-si.net (120 seconds in each
> > > direction)
> > >
> .........................................................................................................................
> > >  Download:  2.74 Mbps
> > >   Latency: (in msec, 121 pings, 0.00% packet loss)
> > >       Min: 12.210
> > >     10pct: 13.002
> > >    Median: 15.077
> > >       Avg: 15.095
> > >     90pct: 16.968
> > >       Max: 18.599
> > >
> .............................................................................................................................
> > >    Upload:  0.49 Mbps
> > >   Latency: (in msec, 101 pings, 0.00% packet loss)
> > >       Min: 12.255
> > >     10pct: 12.684
> > >    Median: 16.679
> > >       Avg: 23.100
> > >     90pct: 34.019
> > >       Max: 170.173
> > >
> > > The tests doesn't look bad, but the problem is I watch a video clip on
> > > youtube and my sister starts torrent client, I can't watch anymore.
> > >
> > > Cheers
> > >
> > > _______________________________________________
> > > Cerowrt-devel mailing list
> > > Cerowrt-devel at lists.bufferbloat.net
> > > https://lists.bufferbloat.net/listinfo/cerowrt-devel
> > >
> >
> >
> >
> > --
> > Dave Täht
> >
> > thttp://www.bufferbloat.net/projects/bloat/wiki/Upcoming_Talks
> >
> > _______________________________________________
> > Cerowrt-devel mailing list
> > Cerowrt-devel at lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/cerowrt-devel
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.bufferbloat.net/pipermail/cerowrt-devel/attachments/20141121/97caa1a0/attachment-0002.html>