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Cannot achieve maximum bandwidth on link.

Posted: 27 Jun 2018, 08:03
by AbduSami
We are connecting our accel machine (accel-ppp-1.10.3), deployed on an ubuntu VM (16.04), to a rp-client setup on another server. The link between the two servers is 10G and we have verified it by running iperf.
When we establish the PPPoE connection between rp-client and Accel the bandwidth decreases to 2 Gbps. Even if we increase the bandwidth assigned to a client or increase the number of clients, the total bandwidth on the link does not increase more than 2 Gbps. What could be the problem for this bandwidth issue using pppoe protocol?

Re: Cannot achieve maximum bandwidth on link.

Posted: 27 Jun 2018, 10:00
by dimka88
Hi, do you use RPS, RFS, balance irq?

Re: Cannot achieve maximum bandwidth on link.

Posted: 29 Jun 2018, 05:49
by AbduSami
No we are not using RPS, RFS or balance IRQ. This should not be a problem when using a single client for generating traffic.
We also increased the size of the interface queue from 3 to 1,000 to no effect.

Re: Cannot achieve maximum bandwidth on link.

Posted: 29 Jun 2018, 12:15
by dimka88
Ok, please show "top" and ethtool -S eth1 on bandwidth test.
ps:// change eth1 to used network interface

Re: Cannot achieve maximum bandwidth on link.

Posted: 02 Jul 2018, 08:36
by AbduSami
'ethtool -S ppp0' is not detecting the interface made through pppoe connection.

Re: Cannot achieve maximum bandwidth on link.

Posted: 02 Jul 2018, 09:29
by AbduSami
Is there a limit of PPPoE protocol at 1Gbps bandwidth?

Re: Cannot achieve maximum bandwidth on link.

Posted: 05 Jul 2018, 03:47
by Dmitry
unlikely, there is no any limits