Linux Virtualization - Apr 2018 - [PATCH] vhost-net: set packet weight of tx polling to 2 * vq size

From: haibinzhang(???) <haibinzhang at tencent.com>
Date: Fri, 6 Apr 2018 08:22:37 +0000
> handle_tx will delay rx for tens or even hundreds of milliseconds when tx
busy
> polling udp packets with small length(e.g. 1byte udp payload), because
setting
> VHOST_NET_WEIGHT takes into account only sent-bytes but no single packet
length.
> 
> Ping-Latencies shown below were tested between two Virtual Machines using
> netperf (UDP_STREAM, len=1), and then another machine pinged the client:
...
> Signed-off-by: Haibin Zhang <haibinzhang at tencent.com>
> Signed-off-by: Yunfang Tai <yunfangtai at tencent.com>
> Signed-off-by: Lidong Chen <lidongchen at tencent.com>
Michael and Jason, please review.