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<
vagrantc >
beeble: so, finally got arm-trusted-firmware into debian ... still have any plans to get puma-rk3399 working with upstream atf?
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<
quark_ >
anyone noticed that if "tx-checksum-ipv6: on" ipv6 transmit performance is very poor? happens at least with rk3399
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<
mmind00 >
quark_: maybe that checksumming is done in software?
15:09
<
quark_ >
I mean very poor <1Mbits
15:10
<
quark_ >
this might be mtu related. I just running test with reduced mtu
15:12
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mmind00 >
quark_: no idea ... i.e. on my rk3399-firefly I got decent rates on an ssh transfer recently (like >10MB/sec)
15:13
<
mmind00 >
but that is all IPv4
15:14
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quark_ >
yup. just tested with MTU 1498. ipv6 transmit is ok when "tx-checksum-ipv6: on"
15:15
<
quark_ >
there is no problem with IPv4 and tx-checksums
15:15
<
quark_ >
ipv6 with MTU 1498 iperf3 send
15:15
<
quark_ >
[ ID] Interval Transfer Bitrate Retr
15:15
<
quark_ >
[ 5] 0.00-10.00 sec 1.08 GBytes 928 Mbits/sec 1 sender
15:15
<
quark_ >
[ 5] 0.00-10.03 sec 1.08 GBytes 923 Mbits/sec receiver
15:16
<
quark_ >
and with mtu > 1498
15:16
<
quark_ >
[ ID] Interval Transfer Bitrate Retr
15:16
<
quark_ >
[ 5] 0.00-10.00 sec 83.7 KBytes 68.5 Kbits/sec 16 sender
15:16
<
quark_ >
[ 5] 0.00-10.04 sec 19.5 KBytes 15.9 Kbits/sec receiver
15:23
<
quark_ >
MTU 1500 and "tx-checksum-ipv6: off" then I get almost 1Gbits with ipv6
15:34
<
quark_ >
hmm. If I set iperf3 maximum segment size to 1438 ipv6 transmit works perfectly. so somehow this is packet size related
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<
stikonas >
there are IPv6 checksumming problems with rockpro64 too
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<
stikonas >
quark_: I disable it in the dts with the patch
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stikonas >
so it's not board specific
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quark_ >
stikonas: have to tried to reduce mtu or run iperf3 with "-M 1438" option?
18:16
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stikonas >
quark_: no, I only tried tx-checksum-ipv6: off
18:17
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stikonas >
I suppose it will help just like it helped you
18:23
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stikonas >
I'll recompile my kernel to test...
18:25
<
quark_ >
I'm trying to make raw capture of network packets. it seems that linux kernel does ipv6 fragmentation even when you just tcpdump packets from interface
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<
stikonas >
quark_: indeed, I added MTUBytes=1438 to my systemd-networkd config and now iperf5 shows about 925 Mbit
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stikonas >
quark_: I didn't realize you are the same person I emailed :D
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stikonas >
quark_: even with lower MTU, somehow my rockpro64 is quite unstable unless I disable tx checksums...
21:35
<
stikonas >
althouth iperf3 performance was higher...
21:35
<
stikonas >
s/althouth/although/
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