On Fri, 29 Jun 2018 23:33:58 -0700
xiangxia.m.yue@gmail.com wrote:

From: Tonghao Zhang <redacted>

This patch improves the guest receive and transmit performance.
On the handle_tx side, we poll the sock receive queue at the
same time. handle_rx do that in the same way.

We set the poll-us=100us and use the iperf3 to test

Where/how do you configure poll-us=100us ?

Are you talking about /proc/sys/net/core/busy_poll ?


p.s. Nice performance boost! :-)

its bandwidth, use the netperf to test throughput and mean
latency. When running the tests, the vhost-net kthread of
that VM, is alway 100% CPU. The commands are shown as below.

iperf3  -s -D
iperf3  -c IP -i 1 -P 1 -t 20 -M 1400

or
netserver
netperf -H IP -t TCP_RR -l 20 -- -O "THROUGHPUT,MEAN_LATENCY"

host -> guest:
iperf3:
* With the patch:     27.0 Gbits/sec
* Without the patch:  14.4 Gbits/sec

netperf (TCP_RR):
* With the patch:     48039.56 trans/s, 20.64us mean latency
* Without the patch:  46027.07 trans/s, 21.58us mean latency

This patch also improves the guest transmit performance.

guest -> host:
iperf3:
* With the patch:     27.2 Gbits/sec
* Without the patch:  24.4 Gbits/sec

netperf (TCP_RR):
* With the patch:     47963.25 trans/s, 20.71us mean latency
* Without the patch:  45796.70 trans/s, 21.68us mean latency

Signed-off-by: Tonghao Zhang <redacted>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer