HAProxy limiting throughput

@Sweeny wrote:

To the good people of the HAProxy forum,
I seem to have a small issue with my HAProxy configuration. For whatever reason I find HAProxy being the cause of a bottleneck in my ingest estate. My setup is as follows: I have 3 frontend servers passing data to the proxy server that’s then distributed (roundrobin) to 6 backend servers. If I remove the proxy from the estate and have the 3 frontend feed directly to the 6 backend we get full throughput. Feed data through the
proxy and data throughput drops by near half. My HAProxy config is shown below, any advice regarding optimising and best practices will be gratefully received.

global
        log /dev/log    local0
        log /dev/log    local1 notice
        chroot /var/lib/haproxy
        stats socket /run/haproxy/admin.sock mode 660 level admin
        stats timeout 30s
        user haproxy
        group haproxy
        daemon

        # Default SSL material locations
        ca-base /etc/ssl/certs
        crt-base /etc/ssl/private

        # Default ciphers to use on SSL-enabled listening sockets.
        # For more information, see ciphers(1SSL).
        ssl-default-bind-ciphers kEECDH+aRSA+AES:kRSA+AES:+AES256:RC4-SHA:!kEDH:!LOW:!EXP:!MD5:!aNULL:!eNULL

defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        timeout connect 9000
        timeout client  90000
        timeout server  90000
        errorfile 400 /etc/haproxy/errors/400.http
        errorfile 403 /etc/haproxy/errors/403.http
        errorfile 408 /etc/haproxy/errors/408.http
        errorfile 500 /etc/haproxy/errors/500.http
        errorfile 502 /etc/haproxy/errors/502.http
        errorfile 503 /etc/haproxy/errors/503.http
        errorfile 504 /etc/haproxy/errors/504.http

frontend frontendserv
        bind *:8990
        mode http
        default_backend serverback

backend serverback
        balance roundrobin
        mode http
        server *server name1* *IP:PORT* check
	server *server name2* *IP:PORT* check
        server *server name3* *IP:PORT* check
        server *server name4* *IP:PORT* check
        server *server name5* *IP:PORT* check
        server *server name6* *IP:PORT* check
                
listen stats
        bind :1936       #Listen on all IP's on port 1936
        mode http
        balance
        stats refresh 5s
        #This is the virtual URL to access the stats page
        stats uri /haproxy_stats

        #Authentication realm. This can be set to anything. Escape space characters with a backslash.
        stats realm HAProxy\ Statistics

Many thanks,

Tom

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