Bug #335
Performance regression with rc6 vs bql-34
Description
I had at one point (or so I recall) been able to coax 400+Mbit out of the router in packet forwardingperformance. Exactly how I did that, it was back in august, and I was using higher
end servers and cards then than I am now.
With bql-34 and my current setup I get only 124Mbit in forwarding
performance between two laptops
with bql on them. This is with kernel 3.2.5 with bql backported.
It isn’t the new qdiscs.
I regressed to rc6 and tried again, only to get 183Mbit that way, using
iperf.
rc6 was 3.0.4 based.
Admittedly I spend most of my time trying to get good 4 mbit
performance, but I do
find this puzzling and this strongly indicates a need for a new
oprofile.
I am also crashing the router with heavy wireless traffic.
History
So I think during that testing I’d been fooling with the depth.
Client connecting to fd43:e2b3:341c:f010::2, TCP port 5001
TCP window size: 256 KByte (WARNING: requested 256 KByte)
————————————————————
[ 3] local fd43:e2b3:341c:1:214:d1ff:fe20:10cb port 39253 connected
with fd43:e2b3:341c:f010::2 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-60.0 sec 1.20 GBytes 171 Mbits/sec
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280 with all the ip6tables rules disabled.
204Mbit with bql set to 9000 and tx 64 and sfqred in place
234Mbit (no typo!) with tx 2
tc -s qdisc show dev ge00
qdisc sfq a: root refcnt 2 limit 300p quantum 1514b depth 127 headdrop divisor 16384 perturb 60000sec
ewma 3 min 4500b max 18000b probability 0.2 ecn
prob_mark 141 prob_mark_head 7363 prob_drop 20
forced_mark 0 forced_mark_head 0 forced_drop 1194
Sent 1863591533 bytes 1247669 pkt (dropped 1214, overlimits 8718 requeues 134180)
rate 624bit 1pps backlog 0b 0p requeues 134180
d@ida:~/t\$ iperf -t 60 -w256k -V -c fd43:e2b3:341c:f010::2
————————————————————
Client connecting to fd43:e2b3:341c:f010::2, TCP port 5001
TCP window size: 256 KByte (WARNING: requested 256 KByte)
————————————————————
[ 3] local fd43:e2b3:341c:1:214:d1ff:fe20:10cb port 38806 connected with fd43:e2b3:341c:f010::2 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-60.0 sec 1.64 GBytes 234 Mbits/sec