Solarflare has a whitepaper on accelerating memcached: http://10gbe.blogspot.com/2014/12/memcached-3x-faster-than-i...

I just whipped this up in 5 minutes and didn't do much of the tuning there (e.g. no isolcpus or interrupt changes), but here's a single-client 1024-byte SET redis-benchmark running against localhost with and without TCP Loopback Acceleration... redis 2.8.4 on a dual E5-2630 @ 2.30GHz, card is SFN5122F but this is all loopback. I'm not claiming anything and just doing it because somebody pondered...

   * plain jane
  /usr/bin/redis-server
  redis-benchmark -t set -q -n 1000000 -d 1024 -c 1
  SET: 21258.96 requests per second
  
   * unaccelerated server, unaccelerated client
   numactl --physcpubind 1,3,5 --preferred 1 /usr/bin/redis-server
   numactl --physcpubind=7,9 --preferred 1  redis-benchmark -t set -q -n 100000 -d 1024 -c 1
  SET: 14293.88 requests per second
  
   * TCP loopback accelerated server, unaccelerated client
  EF_NAME=hn EF_TCP_SERVER_LOOPBACK=2 EF_TCP_CLIENT_LOOPBACK=2 onload -p latency numactl --physcpubind 1,3,5   --preferred 1 /usr/bin/redis-server
  numactl --physcpubind=7,9 --preferred 1  redis-benchmark -t set -q -n   100000 -d 1024 -c 1  
  SET: 25967.28 reque  sts per second

   * TCP loopback accelerated server, accelerated client
  EF_NAME=hn EF_TCP_SERVER_LOOPBACK=2 EF_TCP_CLIENT_LOOPBACK=2 onload -p latency numactl --physcpubind 1,3,5   --preferred 1 /usr/bin/redis-server
  EF_NAME=hn onload -p latency numactl --physcpubind=7 --preferred 1  redis-benchmark -t set -q -n 1000000 -  d 1024 -c 1  
  oo:redis-benchmark[13454]: Sharing OpenOnload 201405-u1 Copyright 2006-2012 Solarflare Communications,   2002-2005 Level 5 Networks [4,hn]
  SET: 96098.41 requests per second

Edit: formatting fixes