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| author |   ? jiang <jiangkidd@hotmail.com> | 2019-08-20 02:51:23 +0000 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2019-09-04 06:21:17 -0400 |
| commit | 718be6bab26fb01fa0147a2b614a3eefd96a2957 (patch) | |
| tree | 1b11a31a2ef6a4afede5b6fe723ebe00b5670ab5 /drivers/vhost | |
| parent | vhost/test: fix build for vhost test (diff) | |
| download | linux-dev-718be6bab26fb01fa0147a2b614a3eefd96a2957.tar.xz linux-dev-718be6bab26fb01fa0147a2b614a3eefd96a2957.zip | |
virtio-net: lower min ring num_free for efficiency
This change lowers ring buffer reclaim threshold from 1/2*queue to budget
for better performance. According to our test with qemu + dpdk, packet
dropping happens when the guest is not able to provide free buffer in
avail ring timely with default 1/2*queue. The value in the patch has been
tested and does show better performance.
Test setup: iperf3 to generate packets to guest (total 30mins, pps 400k, UDP)
avg packets drop before: 2842
avg packets drop after: 360(-87.3%)
Further, current code suffers from a starvation problem: the amount of
work done by try_fill_recv is not bounded by the budget parameter, thus
(with large queues) once in a while userspace gets blocked for a long
time while queue is being refilled. Trigger refills earlier to make sure
the amount of work to do is limited.
Signed-off-by: jiangkidd <jiangkidd@hotmail.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
0 files changed, 0 insertions, 0 deletions