James Matthews wrote:
> net.core.netdev_max_backlog = 5000
> net.ipv4.tcp_window_scaling = 1

Thanks again! Except I already have window_scaling = 1 although I
neglected to say. I had backlog at 262144, I just tried with 5000 and
no change.

Are there any nginx.conf settings that may affect this or is it
likely tcp/ip stack?

Steve