Hi,
I've been running openwrt 18.06.2 for a long time on my WRT1200AC, with
CAKE, and everything has been great. I always got A+ in dslreports for
bufferbloat. I have a 250/100 ETTH connection (IP over ethernet native, no
PPPoE, no PON).
I noticed some intermittent network stuttering issues I wanted to diagnose
last week, so I started looking into this. When doing the test I get
+100ms spikes in the downstream direction when I run CAKE. If I instead
switch to FQ_CODEL I do not see these spikes. As a matter of fact, if I
set my downstream to 300 when running cake and let my ISP handle the
buffering then I get an average of 5-10ms worth of buffering with no
spikes. My ISP isn't bloated in that direction.
# tc qdisc show dev eth1.2
qdisc cake 801f: root refcnt 2 bandwidth 100Mbit diffserv3 triple-isolate nonat
nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 22
qdisc ingress ffff: parent ffff:fff1 ----------------
tc qdisc show dev ifb4eth1.2
qdisc cake 8020: root refcnt 2 bandwidth 240Mbit diffserv3 triple-isolate nonat
nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 22
http://www.dslreports.com/speedtest/52542158 is the result I get with
above settings.
http://www.dslreports.com/speedtest/52542263 is the result with FQ_CODEL:
# tc qdisc show dev eth1.2
qdisc htb 1: root refcnt 2 r2q 10 default 18 direct_packets_stat 0 direct_qlen
1000
qdisc fq_codel 120: parent 1:12 limit 1001p flows 1024 quantum 300 target 5.0ms
interval 100.0ms memory_limit 4Mb ecn
qdisc fq_codel 130: parent 1:13 limit 1001p flows 1024 quantum 300 target 5.0ms
interval 100.0ms memory_limit 4Mb ecn
qdisc fq_codel 110: parent 1:11 limit 1001p flows 1024 quantum 300 target 5.0ms
interval 100.0ms memory_limit 4Mb ecn
qdisc ingress ffff: parent ffff:fff1 ----------------
# tc qdisc show dev ifb4eth1.2
qdisc htb 1: root refcnt 2 r2q 10 default 18 direct_packets_stat 0 direct_qlen
32
qdisc fq_codel 120: parent 1:12 limit 1001p flows 1024 quantum 1500 target
5.0ms interval 100.0ms memory_limit 4Mb ecn
qdisc fq_codel 130: parent 1:13 limit 1001p flows 1024 quantum 300 target 5.0ms
interval 100.0ms memory_limit 4Mb ecn
qdisc fq_codel 110: parent 1:11 limit 1001p flows 1024 quantum 500 target 5.0ms
interval 100.0ms memory_limit 4Mb ecn
How do I diagnose this further?
--
Mikael Abrahamsson email: [email protected]
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