HEADS-UP: IFLIB implementations of sys/dev/e1000 em, lem, igb pending

[Olivier Cochard-Labbé]

On Tue, Jan 24, 2017 at 3:17 PM, Sean Bruno <sbruno at freebsd.org> wrote:

>
>
> Did you increase the number of rx/tx rings to 8 and the number of
> descriptors to 4k in your tests or just the defaults?
>

Tuning are same as described in my previous email (rxd|txd=2048, rx|tx
process_limit=-1, max_interrupt_rate=16000).
[root at apu2]~# sysctl hw.igb.
hw.igb.tx_process_limit: -1
hw.igb.rx_process_limit: -1
hw.igb.num_queues: 0
hw.igb.header_split: 0
hw.igb.max_interrupt_rate: 16000
hw.igb.enable_msix: 1
hw.igb.enable_aim: 1
hw.igb.txd: 2048
hw.igb.rxd: 2048


But I've did a new benchs with default setting, and the performance drop is
now about -25% :

x head r311848 packets-per-second (default settings)
+ head r311849 packets-per-second (default settings)
+--------------------------------------------------------------------------+
|+                                                                         |
|+                                                                       x |
|+                                                                       xx|
|++                                                                      xx|
|                                                                        A||
|A|                                                                        |
+--------------------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   5        618711        621135      619930.5      619840.8     951.83787
+   5        467389        468740        467778      467864.8     550.40322
Difference at 95.0% confidence
        -151976 +/- 1133.9
        -24.5186% +/- 0.150581%
        (Student's t, pooled s = 777.476)