Traffic from 1Gbit machines to other 1Gbit machines is fine - gets ~950mbit.
Traffic from 1Gbit machines to 10Gbit machines is fine - gets ~950mbit.
But...
Traffic from 10Gbit machines to 1Gbit machines has a very high retry count and sits at about 150mbit.
Currently I've got all the 1Gbit machines on a separate subnet and the CRS317 is routing them to the 10G machines - and this is faster, at ~950mbit.
Happens on RouterOS or SwOS - and I've tried the latest RouterOS (6.41rc66) and 6.40.5, both have the issue. SwOS shows the issue too - the 2.3p it ships with I can't get to work, but 2.6 has the issue too. I've also tried with the 1G side being on a SFP-RJ45 converter, the 1G side being 1000BaseLX and the front panel gigabit port. All still do the same thing.
I've looked around and I see a similar thread here with issues on the CSS326.
In the changelogs I also see:
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*) crs326 - fixed packet processing speed on switch chip if individual port link speed differs;
*) crs326 - improved transmit performance from SFP+ to Ethernet ports;
iperf3 example is below. 172.16.1.20 is a 10Gbit server, 172.16.1.19 is a 1Gbit machine.
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-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 172.16.1.19, port 55059
[ 5] local 172.16.1.20 port 5201 connected to 172.16.1.19 port 55060
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 111 MBytes 931 Mbits/sec
[ 5] 1.00-2.00 sec 112 MBytes 940 Mbits/sec
[ 5] 2.00-3.00 sec 112 MBytes 940 Mbits/sec
[ 5] 3.00-4.00 sec 112 MBytes 940 Mbits/sec
[ 5] 4.00-5.00 sec 112 MBytes 940 Mbits/sec
[ 5] 4.00-5.00 sec 112 MBytes 940 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-5.00 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-5.00 sec 569 MBytes 955 Mbits/sec receiver
iperf3: the client has terminated
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Server listening on 5201
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Accepted connection from 172.16.1.19, port 55062
[ 5] local 172.16.1.20 port 5201 connected to 172.16.1.19 port 55063
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 5] 0.00-1.00 sec 17.1 MBytes 143 Mbits/sec 282 12.7 KBytes
[ 5] 1.00-2.00 sec 17.3 MBytes 145 Mbits/sec 266 22.6 KBytes
[ 5] 2.00-3.00 sec 17.5 MBytes 147 Mbits/sec 264 14.1 KBytes
[ 5] 3.00-4.00 sec 17.2 MBytes 144 Mbits/sec 282 14.1 KBytes
[ 5] 4.00-5.00 sec 17.3 MBytes 145 Mbits/sec 251 12.7 KBytes
[ 5] 5.00-6.00 sec 17.4 MBytes 146 Mbits/sec 250 12.7 KBytes
[ 5] 6.00-7.00 sec 17.8 MBytes 149 Mbits/sec 282 15.6 KBytes
[ 5] 7.00-8.00 sec 17.2 MBytes 144 Mbits/sec 295 12.7 KBytes
[ 5] 8.00-9.00 sec 17.3 MBytes 145 Mbits/sec 268 12.7 KBytes
[ 5] 9.00-10.00 sec 17.8 MBytes 149 Mbits/sec 292 22.6 KBytes
[ 5] 10.00-10.01 sec 255 KBytes 247 Mbits/sec 4 14.1 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 5] 0.00-10.01 sec 174 MBytes 146 Mbits/sec 2736 sender
[ 5] 0.00-10.01 sec 0.00 Bytes 0.00 bits/sec receiver