matrix-docker-ansible-deploy/roles/matrix-nginx-proxy/templates/nginx/conf.d/nginx-http.conf.j2

# The default is aligned to the CPU's cache size,
# which can sometimes be too low to handle our 2 vhosts (Synapse and Riot).
#
# Thus, we ensure a larger bucket size value is used.
server_names_hash_bucket_size 64;