On 04/11/2014 08:40 PM, Daniel Borkmann wrote:
On 04/11/2014 08:22 PM, Butler, Peter wrote:
The difference between 3.14 and 3.4.2 is staggering. An order of magnitude or so. For example,
> using the precisely same setup as before, whereas I get about 2.1 Gbps throughput with 3.4 2, I
> can only manage between 70-150 Mbps with 3.14 - a staggering difference.
Moreover, the SCTP throughput seems to 'choke' itself with 3.14, such that it is always trying to
> recover. For example, with 3.4.2 the 2.1 Gbps throughput is quite consistent from one second to
> the next (as you would expect):
[root@Lab200slot2 ~]# iperf3 --sctp -4 -c 192.168.241.3 -V -l 1452 -t 60
iperf version 3.0.1 (10 January 2014)
Linux Lab200slot2 3.4.2-1.fc16.x86_64 #1 SMP Thu Jun 14 20:17:26 UTC 2012 x86_64
Time: Fri, 11 Apr 2014 18:19:15 GMT
Connecting to host 192.168.241.3, port 5201
Cookie: Lab200slot2.1397240355.069035.0d5b0f
[ 4] local 192.168.241.2 port 56030 connected to 192.168.241.3 port 5201
Starting Test: protocol: SCTP, 1 streams, 1452 byte blocks, omitting 0 seconds, 60 second test
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 255 MBytes 2.14 Gbits/sec
[ 4] 1.00-2.00 sec 253 MBytes 2.12 Gbits/sec
[ 4] 2.00-3.00 sec 255 MBytes 2.14 Gbits/sec
[ 4] 3.00-4.00 sec 255 MBytes 2.14 Gbits/sec
[ 4] 4.00-5.00 sec 255 MBytes 2.14 Gbits/sec
[ 4] 5.00-6.00 sec 257 MBytes 2.15 Gbits/sec
[ 4] 6.00-7.00 sec 253 MBytes 2.13 Gbits/sec
[ 4] 7.00-8.00 sec 254 MBytes 2.13 Gbits/sec
[ 4] 8.00-9.00 sec 255 MBytes 2.14 Gbits/sec
[ 4] 9.00-10.00 sec 252 MBytes 2.12 Gbits/sec
(etc)
but with 3.14 the numbers as all over the place:
[root@Lab200slot2 ~]# iperf3 --sctp -4 -c 192.168.241.3 -V -l 1452 -t 60
iperf version 3.0.1 (10 January 2014)
Linux Lab200slot2 3.14.0 #1 SMP Thu Apr 3 23:18:29 EDT 2014 x86_64
Time: Fri, 11 Apr 2014 17:56:21 GMT
Connecting to host 192.168.241.3, port 5201
Cookie: Lab200slot2.1397238981.812898.548918
[ 4] local 192.168.241.2 port 38616 connected to 192.168.241.3 port 5201
Starting Test: protocol: SCTP, 1 streams, 1452 byte blocks, omitting 0 seconds, 60 second test
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.09 sec 20.8 MBytes 161 Mbits/sec
[ 4] 1.09-2.13 sec 10.8 MBytes 86.8 Mbits/sec
[ 4] 2.13-3.15 sec 3.57 MBytes 29.5 Mbits/sec
[ 4] 3.15-4.16 sec 4.33 MBytes 35.7 Mbits/sec
[ 4] 4.16-6.21 sec 10.4 MBytes 42.7 Mbits/sec
[ 4] 6.21-6.21 sec 0.00 Bytes 0.00 bits/sec
[ 4] 6.21-7.35 sec 34.6 MBytes 253 Mbits/sec
[ 4] 7.35-11.45 sec 22.0 MBytes 45.0 Mbits/sec
[ 4] 11.45-11.45 sec 0.00 Bytes 0.00 bits/sec
[ 4] 11.45-11.45 sec 0.00 Bytes 0.00 bits/sec
[ 4] 11.45-11.45 sec 0.00 Bytes 0.00 bits/sec
[ 4] 11.45-12.51 sec 16.0 MBytes 126 Mbits/sec
[ 4] 12.51-13.59 sec 20.3 MBytes 158 Mbits/sec
[ 4] 13.59-14.65 sec 13.4 MBytes 107 Mbits/sec
[ 4] 14.65-16.79 sec 33.3 MBytes 130 Mbits/sec
[ 4] 16.79-16.79 sec 0.00 Bytes 0.00 bits/sec
[ 4] 16.79-17.82 sec 5.94 MBytes 48.7 Mbits/sec
(etc)
Note: the difference appears to be SCTP-specific, as I get exactly the same TCP
> throughput in both kernels.
Hmm, okay. :/ Could you further bisect on your side to narrow down from which
kernel onwards this behaviour can be seen?
Is that behaviour consistent between IPv4 and IPv6?
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