13:29:39 <huy> Hello, I treated my microserver gen8 with a x540-t2 card but I can't push more than 670Mbps, so it's no better with ixgbe than with bge. Could the bottleneck be the cpu? It's a E3-1220L V2.
13:34:37 <jbk> could be a number of things.. probably the first question is how are you measuring that?
13:35:59 <jbk> generally you should be able to get at least a gigabit on a single connection though..
13:37:04 <jbk> once you get past that, it often requires multiple connections (i.e. parallelism) to get the higher speeds
14:21:24 <huy> jbk : iperf3 -c ping.online.net
15:59:33 <sommerfeld> huy: what's your round trip time (as reported by ping -s) to that host?  
15:59:52 <sommerfeld> and have you run iperf3 over LAN to a nearby system?
16:02:04 <sommerfeld> you may be limited by TCP send window sizing if it's a WAN speed test; you can adjust those values upward with ipadm but overdoing it can hurt your LAN performance (this is a bug, and I'm working on it..) 
16:04:14 <sommerfeld> (rule of thumb: the buffer size must exceed the bandwidth-delay product of the path.  delay= round trip time; bandwidth: speed of your share of the slowest link (in bytes per second).
16:05:36 <huy> PING ping.online.net: 56 data bytes
16:05:37 <huy> 64 bytes from 51.158.1.21: icmp_seq=0. time=14.372 ms
16:06:29 <sommerfeld> destination 15ms away, 1Gbps link -> BDP is 0.015 seconds * 1Gbps = 15000000bits = 1875000 bytes
16:06:59 <sommerfeld> what does "ipadm show-prop tcp" show?
16:07:28 <sommerfeld> specifically the max_buf and send_buf properties?
16:07:59 <huy> tcp   max_buf               rw   1048576      --           1048576      8192-1073741824
16:08:02 <huy> tcp   send_buf              rw   128000       --           128000       4096-1048576
16:08:33 <sommerfeld> bump up send_buf a bit and see if it gets better.
16:08:43 <sommerfeld> and maybe max_buf as well.
16:14:19 <huy> Hm it does not change much, it's actually a bit worse, I changed send_buf to 164000 and max_buf to 2097152
16:15:39 <sommerfeld> you may be at the limits of that path.
16:20:39 <sommerfeld> do you have a local (wired ethernet LAN) host to test against?
16:21:26 <huy> I'm trying that now
16:28:26 <huy> 927 Mbits/sec sender, 925 Mbits/sec receiver
16:29:00 <huy> The other end only as 1Gbps interface
16:33:53 <sommerfeld> after some tuning I see up to 9.39 Gbits/sec between two systems with X710 (i40e) connected to the same switch. 
16:34:02 <danmcd> A couple of things to remember:
16:34:32 <danmcd> - those ipadm properties are *per zone* in SmartOS Native-or-LX zones.  Fixing it in the GZ doesn't affect zones at all.
16:35:47 <danmcd> - Actually, the other thing was already covered (what's the path between you and test-peer).
16:36:23 <huy> It's a laptop running debian. The thing is that I get the same numbers to ping.online.net when I connect it to the same uplink, which is a ffth box. 
16:36:54 <huy> And I was testing in the GZ