Re: [PATCH v2 00/32] Use dual stack sockets to listen for inbound TCP connections

On Thu, 17 Nov 2022 16:58:36 +1100
David Gibson <david(a)gibson.dropbear.id.au> wrote:

...
  When forwarding many ports, passt can consume a lot of
kernel memory
 because of the many listening sockets it opens.  There are not a lot
 of ways we can reduce that, but here's one.
 
 Currently we create separate listening sockets for each port for both
 IPv4 and IPv6.  However in Linux (and probably other platforms), it's
 possible to listen for both IPv4 and IPv6 connections on an IPv6
 socket.  This series uses such dual stack sockets to halve the number
 of listening sockets needed for TCP.  When forwarding all TCP and UDP
 ports, this reduces the kernel memory used from around 677 MiB to
 around 487 MiB (kernel 6.0.8 on an x86_64 Fedora 37 machine). 
Applied, thanks!

-- 
Stefano