tcp: Avoid unnecessary ACK
tcp: Avoid unnecessary ACK

E.g. Avoid Dup ACK in packet #981

979 4.115432000 192.168.66.123 -> 192.168.66.100 TCP 20406
    [TCP Window Full] 10000 > 50112 [ACK] Seq=10675905 Ack=801512443 Win=3737600 Len=20352

980 4.119002000 192.168.66.100 -> 192.168.66.123 TCP 54
    [TCP ZeroWindow] 50112 > 10000 [ACK] Seq=801512443 Ack=10696257 Win=0 Len=0

981 4.119063000 192.168.66.123 -> 192.168.66.100 TCP 54
    [TCP Dup ACK 979#1] 10000 > 50112 [ACK] Seq=10696257 Ack=801512443 Win=3737600 Len=0

982 4.137244000 192.168.66.100 -> 192.168.66.123 TCP 54
    [TCP Window Update] 50112 > 10000 [ACK] Seq=801512443 Ack=10696257 Win=40704 Len=0

norcimo5/seastar,dreamsxin/seastar,justintung/scylla,phonkee/scylla,rentongzhang/scylla,asias/scylla,senseb/scylla,bzero/seastar,aruanruan/scylla,flashbuckets/seastar,respu/scylla,raphaelsc/scylla,chunshengster/seastar,stamhe/seastar,shyamalschandra/seastar,raphaelsc/scylla,dwdm/scylla,scylladb/scylla-seastar,glommer/scylla,acbellini/scylla,glommer/scylla,jonathanleang/seastar,eklitzke/scylla,rluta/scylla,joerg84/seastar,shyamalschandra/seastar,bowlofstew/seastar,victorbriz/scylla,rentongzhang/scylla,kjniemi/seastar,scylladb/scylla,dwdm/scylla,hongliangzhao/seastar,dwdm/scylla,flashbuckets/seastar,acbellini/scylla,koolhazz/seastar,gwicke/scylla,wildinto/scylla,kangkot/scylla,stamhe/scylla,senseb/scylla,kjniemi/seastar,printedheart/seastar,chunshengster/seastar,linearregression/seastar,leejir/seastar,syuu1228/seastar,scylladb/scylla-seastar,eklitzke/scylla,wildinto/seastar,avikivity/scylla,scylladb/seastar,rluta/scylla,stamhe/seastar,printedheart/seastar,sjperkins/seastar,avikivity/seastar,capturePointer/scylla,ducthangho/imdb,bowlofstew/scylla,kjniemi/scylla,justintung/scylla,wildinto/seastar,stamhe/scylla,guiquanz/scylla,wildinto/seastar,acbellini/seastar,asias/scylla,phonkee/scylla,kangkot/scylla,avikivity/seastar,dwdm/seastar,anzihenry/seastar,phonkee/scylla,tempbottle/scylla,raphaelsc/seastar,norcimo5/seastar,avikivity/scylla,xtao/seastar,ducthangho/imdb,leejir/seastar,duarten/scylla,koolhazz/seastar,printedheart/seastar,tempbottle/seastar,scylladb/scylla-seastar,cloudius-systems/seastar,xtao/seastar,avikivity/seastar,wildinto/scylla,respu/scylla,victorbriz/scylla,rentongzhang/scylla,anzihenry/seastar,kjniemi/scylla,syuu1228/seastar,tempbottle/seastar,victorbriz/scylla,bowlofstew/scylla,capturePointer/scylla,linearregression/scylla,shaunstanislaus/scylla,raphaelsc/seastar,rluta/scylla,gwicke/scylla,linearregression/scylla,anzihenry/seastar,duarten/scylla,chunshengster/seastar,hongliangzhao/seastar,kangkot/scylla,raphaelsc/scylla,slivne/seastar,avikivity/scylla,joerg84/seastar,mixja/seastar,aruanruan/scylla,scylladb/seastar,acbellini/scylla,ducthangho/imdb,flashbuckets/seastar,tempbottle/scylla,linearregression/scylla,guiquanz/scylla,sjperkins/seastar,acbellini/seastar,scylladb/seastar,acbellini/seastar,bowlofstew/seastar,shaunstanislaus/scylla,syuu1228/seastar,xtao/seastar,linearregression/seastar,joerg84/seastar,scylladb/scylla,tempbottle/seastar,shaunstanislaus/scylla,dwdm/seastar,slivne/seastar,shyamalschandra/seastar,bzero/seastar,aruanruan/scylla,mixja/seastar,stamhe/seastar,duarten/scylla,hongliangzhao/seastar,gwicke/scylla,justintung/scylla,bowlofstew/scylla,slivne/seastar,kjniemi/scylla,capturePointer/scylla,bowlofstew/seastar,raphaelsc/seastar,tempbottle/scylla,scylladb/scylla,norcimo5/seastar,respu/scylla,jonathanleang/seastar,senseb/scylla,bzero/seastar,dwdm/seastar,guiquanz/scylla,leejir/seastar,koolhazz/seastar,cloudius-systems/seastar,linearregression/seastar,sjperkins/seastar,jonathanleang/seastar,dreamsxin/seastar,wildinto/scylla,scylladb/scylla,cloudius-systems/seastar,dreamsxin/seastar,asias/scylla,eklitzke/scylla,stamhe/scylla,glommer/scylla,mixja/seastar,kjniemi/seastar