Ah ceci explique cela. Est-ce la seule solution pour une courte distance ? Mon câble actuel convient bien mais ne fait que 30cm. Les 30 cm font donc perdre la moitié du débit soit pire que de l'Ethernet 1G en UL
EDIT: les avis sur le câble direct attach que j'utilise donnent des débits similaire à ce que j'ai en Ethernet en UL et jusqu'à 10G en upload. Le câble aurait peut-être un défaut de fabrication ?
EDIT2: je trouve assez suspect que la valeur donnée soit pile à la moitié de la valeur "attendue" : 350 mbps en UL au lieu de 700 et 3000 à 3500 au lieu de 6000-7000 mbps
J'ai essayé avec un cable DAC plus long de la même marque, le comportement est le même (même chipset). En utilisant les fichiers dispos sur la delta j'ai bien les 10G en download, mais impossible de tester le 10G en upload.
En faisant un iperf3 entre la machine Debian SFP+ 10G sur Delta et une autre machine Debian 1GbE RJ45 j'ai bien du 1G symétrique.
En revanche dès que ça concerne un serveur "internet" il y a quelque chose d'étrange :
En upload
~# iperf3 -c iperf3.moji.fr -p 5203 -t 30
Connecting to host iperf3.moji.fr, port 5203
[ 5] local 2a01:x:9218 port 45372 connected to 2a06:c484:6::3:1 port 5203
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 41.2 MBytes 346 Mbits/sec 360 675 KBytes
[ 5] 1.00-2.00 sec 45.0 MBytes 377 Mbits/sec 0 715 KBytes
[ 5] 2.00-3.00 sec 46.2 MBytes 388 Mbits/sec 0 763 KBytes
[ 5] 3.00-4.00 sec 50.0 MBytes 419 Mbits/sec 0 810 KBytes
[ 5] 4.00-5.00 sec 52.5 MBytes 440 Mbits/sec 0 859 KBytes
[ 5] 5.00-6.00 sec 56.2 MBytes 472 Mbits/sec 0 906 KBytes
[ 5] 6.00-7.00 sec 58.8 MBytes 493 Mbits/sec 0 955 KBytes
[ 5] 7.00-8.00 sec 62.5 MBytes 524 Mbits/sec 0 1004 KBytes
[ 5] 8.00-9.00 sec 66.2 MBytes 556 Mbits/sec 0 1.03 MBytes
[ 5] 9.00-10.00 sec 68.8 MBytes 577 Mbits/sec 0 1.07 MBytes
[ 5] 10.00-11.00 sec 71.2 MBytes 598 Mbits/sec 0 1.12 MBytes
[ 5] 11.00-12.00 sec 75.0 MBytes 629 Mbits/sec 0 1.17 MBytes
[ 5] 12.00-13.00 sec 78.8 MBytes 661 Mbits/sec 0 1.22 MBytes
[ 5] 13.00-14.00 sec 81.2 MBytes 682 Mbits/sec 0 1.27 MBytes
[ 5] 14.00-15.00 sec 81.2 MBytes 682 Mbits/sec 0 1.31 MBytes
[ 5] 15.00-16.00 sec 81.2 MBytes 682 Mbits/sec 0 1.36 MBytes
[ 5] 16.00-17.00 sec 81.2 MBytes 682 Mbits/sec 0 1.40 MBytes
[ 5] 17.00-18.00 sec 71.2 MBytes 598 Mbits/sec 3 1.10 MBytes
[ 5] 18.00-19.00 sec 75.0 MBytes 629 Mbits/sec 0 1.20 MBytes
[ 5] 19.00-20.00 sec 81.2 MBytes 682 Mbits/sec 0 1.28 MBytes
[ 5] 20.00-21.00 sec 81.2 MBytes 682 Mbits/sec 0 1.34 MBytes
[ 5] 21.00-22.00 sec 81.2 MBytes 682 Mbits/sec 0 1.38 MBytes
[ 5] 22.00-23.00 sec 81.2 MBytes 682 Mbits/sec 0 1.40 MBytes
[ 5] 23.00-24.00 sec 81.2 MBytes 682 Mbits/sec 0 1.42 MBytes
[ 5] 24.00-25.00 sec 68.8 MBytes 577 Mbits/sec 4 1.06 MBytes
[ 5] 25.00-26.00 sec 71.2 MBytes 598 Mbits/sec 0 1.12 MBytes
[ 5] 26.00-27.00 sec 73.8 MBytes 619 Mbits/sec 0 1.16 MBytes
[ 5] 27.00-28.00 sec 77.5 MBytes 650 Mbits/sec 0 1.18 MBytes
[ 5] 28.00-29.00 sec 78.8 MBytes 661 Mbits/sec 0 1.22 MBytes
[ 5] 29.00-30.00 sec 81.2 MBytes 682 Mbits/sec 0 1.27 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-30.00 sec 2.05 GBytes 588 Mbits/sec 367 sender
[ 5] 0.00-30.02 sec 2.05 GBytes 587 Mbits/sec receiver
iperf Done.
Le retransmit est très important sur la première seconde de test, même phénomène que ce soit en IPv4/IPv6.
En download:
iperf3 -c iperf3.moji.fr -p 5203 -t 30 -R
Connecting to host iperf3.moji.fr, port 5203
Reverse mode, remote host iperf3.moji.fr is sending
[ 5] local 2a01:x:9218 port 55216 connected to 2a06:c484:6::3:1 port 5203
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 198 MBytes 1.66 Gbits/sec
[ 5] 1.00-2.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 2.00-3.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 3.00-4.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 4.00-5.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 5.00-6.00 sec 226 MBytes 1.89 Gbits/sec
[ 5] 6.00-7.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 7.00-8.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 8.00-9.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 9.00-10.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 10.00-11.00 sec 175 MBytes 1.47 Gbits/sec
[ 5] 11.00-12.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 12.00-13.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 13.00-14.00 sec 225 MBytes 1.88 Gbits/sec
[ 5] 14.00-15.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 15.00-16.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 16.00-17.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 17.00-18.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 18.00-19.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 19.00-20.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 20.00-21.00 sec 199 MBytes 1.67 Gbits/sec
[ 5] 21.00-22.00 sec 202 MBytes 1.70 Gbits/sec
[ 5] 22.00-23.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 23.00-24.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 24.00-25.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 25.00-26.00 sec 224 MBytes 1.88 Gbits/sec
[ 5] 26.00-27.00 sec 225 MBytes 1.88 Gbits/sec
[ 5] 27.00-28.00 sec 223 MBytes 1.87 Gbits/sec
[ 5] 28.00-29.00 sec 225 MBytes 1.89 Gbits/sec
[ 5] 29.00-30.00 sec 224 MBytes 1.88 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-30.01 sec 6.46 GBytes 1.85 Gbits/sec 4 sender
[ 5] 0.00-30.00 sec 6.45 GBytes 1.85 Gbits/sec receiver
iperf Done.