Tcp keep-alive: send three probes before detectin an error.
Tcp keep-alive: send three probes before detectin an error.

Otherwise we end with less reliable connections because it's too easy
that a single packet gets lost.

rouzier/redis,mgk/redis,mpalmer/redis,badboy/redis,roth1002/redis,brg-liuwei/redis,xujunhai1991/redis,healerkx/redis,oranagra/redis,Aliceljm1/redis,gilala/bjredis,flashbuckets/redis,190235047/redis,narma/redis,yuhc/redis-benchmark-enhanced,ofirluzon/redis,citusdata/redis,tzq668766/redis-3.0-annotated,dayuoba/redis,fengshao0907/redis-3.0-annotated,oranagra/redis,wangyikai/redis,nnog/redis,izhoujie/redis,ton31337/redis,gilala/bjredis,qiyang0221/redis,seandsky/redis,whille/redis-3.0-annotated,jacklee0810/redis-3.0-annotated,HeartSaVioR/redis,neomantra/redis,alenslan/redis,kaushik94/redis,colstrom/redis,YongMan/redis,zczhuohuo/redis,tzq668766/redis-3.0-annotated,wprice/redis,PradheepShrinivasan/redis,devaos/redis,Soledad89/redis,LongXQ/redis,mumingv/redis-3.0-annotated,roth1002/redis,harrisonfeng/redis,itamarhaber/redis,xlzhan/redis,mingyaaaa/redis,atreeyang/redis,zhaobo1023/redis-3.0-annotated,j0hnma/hszredis,itamarhaber/redis,j0hnma/hszredis,YuanZhewei/redis,zhoudayang/redis,soloestoy/redis,CodeJuan/redis,qiyang0221/redis,ketor/redis,charsyam/redis,modulexcite/redis,hedisdb/hedis,dayuoba/redis,yuhc/redis-benchmark-enhanced,whille/redis-3.0-annotated,cloudrain21/redis,taoguan/redis,zhiliaoniu/redis,StevenTsai/redis,jackyan/redis,rrsean/redis-3.0-annotated,YuraLukashik/redis,jacklee0810/redis-3.0-annotated,ipmobiletech/redis,cnbin/redis,Aliceljm1/redis,HunanTV/redis,SummonY/redis,YuraLukashik/redis,tzq668766/redis-3.0-annotated,dongqifan2/redis-3.0-annotated,seandsky/redis,programmecat/redis,fengshao0907/redis-3.0-annotated,idning/redis,Aliceljm1/redis-3.0-annotated,gilala/hredis,simplestbest/redis,darksideofthemoo/redis-histogram,ytjiang/redis,nnog/redis,fengshao0907/redis,xuzhezhaozhao/redis_reading,yuhc/redis-benchmark-enhanced,zczhuohuo/redis,july2993/redis,timothyohare/3rdPartySrc-redis,gilala/hbjredis,pietern/redis,gaoxianglong/redis,davidradunz/redis,jasonkying/redis,Cisphyx/redis-websockets,valdsJohn/redis,nilyang/redis-tdd-annotation,zhiliaoniu/redis,wangyikai/redis,idning/redis,0x20h/redis,CodeJuan/redis,izhoujie/redis,mingyaaaa/redis,flashbuckets/redis,mgk/redis,riyan8250/redis,maodeyi/redis_lua,badboy/redis,cloudrain21/redis,csuhawk/redis,SyntaxStacks/redis,z-fork/redis,qiyang0221/redis,seppo0010/rlite-server,Cisphyx/redis-websockets,nilyang/redis-tdd-annotation,healerkx/redis,Markgorden/redis,0x55/redis-3.0-annotated,zhoudayang/redis,ofirluzon/redis,huyuezheng/redis,Aaron1992/redis,mgk/redis,badboy/redis,zhaobo1023/redis-3.0-annotated,magastzheng/redis-3.0-annotated,mingyaaaa/redis,MSOpenTech/redis,simplestbest/redis,Wangyao14cyy/redis,SyntaxStacks/redis,YuanZhewei/redis,AplayER/redis,ncopa/redis,rrsean/redis-3.0-annotated,AALEKH/redis,honestme/redis,charsyam/redis,ituncle/redis,mattsta/redis,pcarrier/redis,pedigree/redis,roth1002/redis,mumingv/redis,rogerchina/redis,zhaobo1023/redis-3.0-annotated,j0hnma/szredis,cusspvz/redis,wenxueliu/redis_comment,GitHubMota/redis,idning/redis,a-pavlov/redis,kensou97/redis,gilala/hbjredis,HouKangkang/redis-3.0-annotated,aim-for-better/redis,AplayER/redis,arijitvt/redis,xujunhai1991/redis,ncopa/redis,spearhead-ea/redis,ipmobiletech/redis,cusspvz/redis,wujf/redis,devaos/redis,davidradunz/redis,francischan714/redis,hedisdb/hedis,elkingtonmcb/redis,haima-zju/redis-3.0-annotated,saisai/redis,ksarch-saas/redis,timothyohare/3rdPartySrc-redis,colstrom/redis,gilala/bjredis,shining-yang/redis,arijitvt/redis,josiahcarlson/redis,zhiliaoniu/redis,StevenTsai/redis,hornen/redis,ofirluzon/redis,rogerchina/redis,Aliceljm1/redis-3.0-annotated,mcanthony/redis,weizijun/redis,twskipper/redis,kaushik94/redis,seppo0010/redis,oranagra/redis,badboy/redis,yybirdcf/learn-redis,hawkchch/redis,ouyangkongtong/redis,tanghaodong25/redis,xuzhezhaozhao/redis_reading,vincent-vivian-liu/redis,gilala/hredis,modulexcite/redis,duanx/redis,ksarch-saas/redis,mcanthony/redis,duanx/redis,harrisonfeng/redis,MasahikoSawada/redis,takeshineshiro/redis,ton31337/redis,NBSW/redis,haima-zju/redis-3.0-annotated,darksideofthemoo/redis-histogram,charsyam/redis,tjschuck/redis,sunheehnus/redis,programmecat/redis,gilala/bjredis,healerkx/redis,kaushik94/redis,onlymellb/redis-3.0-annotated,zhcy/redis,allengaller/redis,elkingtonmcb/redis,xuguruogu/redis,PKRoma/redis,soveran/redis,hornen/redis,iandyh/redis,pietern/redis,cnbin/redis,shshlzh/redis-3.0-annotated,Sciumo/redis,spinlock/redis,wbailey5/redis,gaoxianglong/redis,haima-zju/redis-3.0-annotated,mcanthony/redis,louisliangjun/redis,abhiklodh/redis,wujf/redis,wbailey5/redis,saisai/redis,wbailey5/redis,ketor/redis,hawkchch/redis,mumingv/redis,xlzhan/redis,HunanTV/redis,dayuoba/redis,shining-yang/redis,AALEKH/redis,ituncle/redis,gaoxianglong/redis,jermnelson/redis,harrisonfeng/redis,spinlock/redis,fankeke/redis-3.0-annotated,adamweixuan/redis-3.0-annotated,HeartSaVioR/redis,huyuezheng/redis,weizijun/redis,xlzhan/redis,dreamquster/redis,jingjidejuren/redis,Soledad89/redis,mengyou0304/redis,AplayER/redis,iandyh/redis,ofirluzon/redis,fengshao0907/redis-3.0-annotated,wujf/redis,cnbin/redis,whille/redis-3.0-annotated,MOON-CLJ/redis,OmarQunsul/graph-redis,ctripcorp/redis,ouyangkongtong/redis,onlymellb/redis-3.0-annotated,j0hnma/szredis,programmecat/redis,jackyan/redis,ctripcorp/redis,j0hnma/szredis,dongqifan2/redis-3.0-annotated,JoeWoo/redis,honestme/redis,nilyang/redis-tdd-annotation,modulexcite/redis,PKRoma/redis,ramonsnir/redis,jbochi/parallel_redis,netroby/redis,huangz1990/redis-3.0-annotated,cnbin/redis,xujunhai1991/redis,programmecat/redis,allengaller/redis,Hailei/redis,yuzhangjob/redis-3.0-annotated-unstable,sunlianqiang/redis-3.0-annotated,wbailey5/redis,francischan714/redis,MSOpenTech/redis,pkdevbox/redis,GrimDerp/redis,HouKangkang/redis-3.0-annotated,kmiku7/redis,thomasdarimont/redis,shshlzh/redis-3.0-annotated,MasahikoSawada/redis,timothyohare/3rdPartySrc-redis,mumingv/redis,xuzhezhaozhao/redis_reading,mgk/redis,miaoyc1989/redis-3.0-annotated,louisliangjun/redis,pedigree/redis,brg-liuwei/redis,devaos/redis,neomantra/redis,yossigo/redis,NBSW/redis,csuhawk/redis,saisai/redis,Hailei/redis,190235047/redis,wprice/redis,JoeWoo/redis,j0hnma/hszredis,CodeJuan/redis,xuguruogu/redis,nnog/redis,cusspvz/redis,seppo0010/rlite-server,mverrilli/redis,ttuna/msot-redis,gilala/hbjredis,valdsJohn/redis,janekmi/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,rogerchina/redis,gilala/redis,pkdevbox/redis,twskipper/redis,dayuoba/redis,PKRoma/redis,duanx/redis,alenslan/redis,Sciumo/redis,GrimDerp/redis,Soledad89/redis,gechong/redis-3.0-annotated,ErikDubbelboer/redis,0x20h/redis,dreamquster/redis,takeshineshiro/redis,moonbingbing/redis-3.0-annotated,aim-for-better/redis,cloudrain21/redis,sunheehnus/redis,itamarhaber/redis,seandsky/redis,gechong/redis-3.0-annotated,twskipper/redis,MSOpenTech/redis,YongMan/redis,MOON-CLJ/redis,idning/redis,pcarrier/redis,0x55/redis-3.0-annotated,HouKangkang/redis-3.0-annotated,PKRoma/redis,ituncle/redis,dongqifan2/redis-3.0-annotated,clamoriniere1A/redis,citusdata/redis,soveran/redis,adamweixuan/redis-3.0-annotated,Wangyao14cyy/redis,clamoriniere1A/redis,ksarch-saas/redis,zguangyu/redis,pietern/redis,atreeyang/redis,valdsJohn/redis,taoguan/redis,soloestoy/redis,tellapart/redis,kmiku7/redis,nilyang/redis-tdd-annotation,elkingtonmcb/redis,seppo0010/rlite-server,vincent-vivian-liu/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,Wangyao14cyy/redis,xuzhezhaozhao/redis_reading,abhiklodh/redis,miaoyc1989/redis-3.0-annotated,mengzhejin/RedisStudy,riyan8250/redis,hedisdb/hedis,ErikDubbelboer/redis,hgl888/redis,himoca/redis,mengzhejin/RedisStudy,GitHubMota/redis,YuanZhewei/redis,drinkthere/redis-3.0-annotated,fengshao0907/redis,ipmobiletech/redis,july2993/redis,weizijun/redis,sunlianqiang/redis-3.0-annotated,jbochi/parallel_redis,GitHubMota/redis,ErikDubbelboer/redis,huangz1990/experiment-redis,itugs/redis,takeshineshiro/redis,yuhc/redis-benchmark-enhanced,mumingv/redis,PKRoma/redis,timothyohare/3rdPartySrc-redis,huangz1990/experiment-redis,0x20h/redis,supasate/redis,july2993/redis,netroby/redis,zczhuohuo/redis,Markgorden/redis,ton31337/redis,tellapart/redis,hawkchch/redis,mverrilli/redis,hgl888/redis,spinlock/redis,francischan714/redis,z-fork/redis,hawkchch/redis,rouzier/redis,gongice/redis-3.0-annotated,msn217/redis-3.0-annotated,xuguruogu/redis,HunanTV/redis,yybirdcf/learn-redis,huyuezheng/redis,jingjidejuren/redis,moonbingbing/redis-3.0-annotated,brg-liuwei/redis,jbochi/redis,wenxueliu/redis_comment,tanghaodong25/redis,huyuezheng/redis,Soledad89/redis,itamarhaber/redis,unasm/redis-3.0-annotated,Markgorden/redis,zhcy/redis,tjschuck/redis,mengzhejin/RedisStudy,nuxeh/redis,allengaller/redis,duanx/redis,splitice/redis,gechong/redis-3.0-annotated,atreeyang/redis,splitice/redis,pedigree/redis,ReadCode/redis-3.0-annotated,vincent-vivian-liu/redis,neomantra/redis,HeartSaVioR/redis,ofirluzon/redis,jackyan/redis,josiahcarlson/redis,LongXQ/redis,nnog/redis,mverrilli/redis,shshlzh/redis-3.0-annotated,4396/redis,spearhead-ea/redis,neomantra/redis,h0x91b/redis,AplayER/redis,izhoujie/redis,colstrom/redis,shining-yang/redis,holstvoogd/redis,fengshao0907/redis,MSOpenTech/redis,soloestoy/redis,mattsta/redis,louisliangjun/redis,nuxeh/redis,GitHubMota/redis,miaoyc1989/redis-3.0-annotated,ErikDubbelboer/redis,wujf/redis,Hailei/redis,blackmady/redis,francischan714/redis,kmiku7/redis,blackmady/redis,ouyangkongtong/redis,4396/redis,jbochi/parallel_redis,colstrom/redis,pietern/redis,drinkthere/redis-3.0-annotated,sunlianqiang/redis-3.0-annotated,guker/redis,adamweixuan/redis-3.0-annotated,july2993/redis,modulexcite/redis,buobao/redis-3.0-annotated,gilala/hbjredis,PradheepShrinivasan/redis,Sciumo/redis,xujunhai1991/redis,holstvoogd/redis,flashbuckets/redis,zy416548283/redis-3.0-annotated,zhoudayang/redis,oranagra/redis,rogerlz/redis,sunheehnus/redis,maodeyi/redis_lua,twskipper/redis,ttuna/msot-redis,antirez/redis,zczhuohuo/redis,OmarQunsul/graph-redis,JoeWoo/redis,rogerlz/redis,shshlzh/redis-3.0-annotated,nuxeh/redis,YuanZhewei/redis,ctripcorp/redis,davidradunz/redis,mpalmer/redis,yuzhangjob/redis-3.0-annotated-unstable,guker/redis,SummonY/redis,simplestbest/redis,SummonY/redis,itugs/redis,RepmujNetsik/redis,tellapart/redis,LongXQ/redis,brg-liuwei/redis,universsky/redis,jxwr/redis,mverrilli/redis,harrisonfeng/redis,h0x91b/redis,soveran/redis,itugs/redis,taoguan/redis,janekmi/redis,jingjidejuren/redis,MasahikoSawada/redis,AALEKH/redis,roth1002/redis,soveran/redis,ouyangkongtong/redis,gilala/redis,nuxeh/redis,ytjiang/redis,huangz1990/redis-3.0-annotated,pmem/redis,magastzheng/redis-3.0-annotated,huangz1990/experiment-redis,unasm/redis-3.0-annotated,fankeke/redis-3.0-annotated,hedisdb/hedis,PradheepShrinivasan/redis,pcarrier/redis,antirez/redis,rouzier/redis,fankeke/redis-3.0-annotated,ton31337/redis,LongXQ/redis,Aliceljm1/redis-3.0-annotated,z-fork/redis,saisai/redis,tjschuck/redis,gongice/redis-3.0-annotated,izhoujie/redis,ttuna/msot-redis,yybirdcf/learn-redis,Sciumo/redis,splitice/redis,soloestoy/redis,jacklee0810/redis-3.0-annotated,mumingv/redis-3.0-annotated,Aaron1992/redis,hgl888/redis,qiyang0221/redis,0x55/redis-3.0-annotated,xlzhan/redis,universsky/redis,jermnelson/redis,mpalmer/redis,Aaron1992/redis,davidradunz/redis,gongice/redis-3.0-annotated,shreesundara/redis,slfs007/mk-redis,ytjiang/redis,MasahikoSawada/redis,dreamquster/redis,msn217/redis-3.0-annotated,seandsky/redis,rouzier/redis,RepmujNetsik/redis,wuyu201321060203/redis-3.0-annotated,jxwr/redis,0x20h/redis,csuhawk/redis,kensou97/redis,zguangyu/redis,RepmujNetsik/redis,yossigo/redis,guker/redis,Cisphyx/redis-websockets,mpalmer/redis,magastzheng/redis-3.0-annotated,YuraLukashik/redis,elkingtonmcb/redis,yossigo/redis,OmarQunsul/graph-redis,jasonkying/redis,pedigree/redis,ctripcorp/redis,RepmujNetsik/redis,mattsta/redis,CodeJuan/redis,atreeyang/redis,antirez/redis,supasate/redis,zhoudayang/redis,soloestoy/redis,buobao/redis-3.0-annotated,supasate/redis,shreesundara/redis,charsyam/redis,kmiku7/redis,jxwr/redis,Aliceljm1/redis,ncopa/redis,gilala/hredis,buobao/redis-3.0-annotated,devaos/redis,hgl888/redis,allengaller/redis,iandyh/redis,h0x91b/redis,shreesundara/redis,wuyu201321060203/redis-3.0-annotated,gaoxianglong/redis,spinlock/redis,abhiklodh/redis,linfangrong/redis,yossigo/redis,jasonkying/redis,kensou97/redis,takeshineshiro/redis,seppo0010/rlite-server,valdsJohn/redis,drinkthere/redis-3.0-annotated,ramonsnir/redis,wprice/redis,YongMan/redis,rogerchina/redis,maodeyi/redis_lua,blackmady/redis,itugs/redis,rogerlz/redis,Wangyao14cyy/redis,SyntaxStacks/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,spearhead-ea/redis,yossigo/redis,narma/redis,guker/redis,simplestbest/redis,gilala/redis,honestme/redis,zhcy/redis,j0hnma/szredis,huangz1990/experiment-redis,jbochi/redis,Markgorden/redis,slfs007/mk-redis,honestme/redis,louisliangjun/redis,flashbuckets/redis,ttuna/msot-redis,csuhawk/redis,zy416548283/redis-3.0-annotated,mingyaaaa/redis,healerkx/redis,wangyikai/redis,jingjidejuren/redis,himoca/redis,zy416548283/redis-3.0-annotated,j0hnma/hszredis,a-pavlov/redis,zguangyu/redis,ramonsnir/redis,clamoriniere1A/redis,alenslan/redis,iandyh/redis,cloudrain21/redis,rogerlz/redis,dreamquster/redis,OmarQunsul/graph-redis,darksideofthemoo/redis-histogram,wangyikai/redis,tjschuck/redis,josiahcarlson/redis,AALEKH/redis,supasate/redis,thomasdarimont/redis,clamoriniere1A/redis,z-fork/redis,shreesundara/redis,rrsean/redis-3.0-annotated,thomasdarimont/redis,pcarrier/redis,Hailei/redis,wuyu201321060203/redis-3.0-annotated,ketor/redis,wenxueliu/redis_comment,abhiklodh/redis,hornen/redis,himoca/redis,Aliceljm1/redis,ytjiang/redis,190235047/redis,neomantra/redis,unasm/redis-3.0-annotated,kaushik94/redis,MOON-CLJ/redis,netroby/redis,splitice/redis,pmem/redis,a-pavlov/redis,ituncle/redis,GrimDerp/redis,josiahcarlson/redis,universsky/redis,190235047/redis,GrimDerp/redis,gilala/hredis,ReadCode/redis-3.0-annotated,hornen/redis,h0x91b/redis,mengzhejin/RedisStudy,kensou97/redis,citusdata/redis,mcanthony/redis,seppo0010/redis,huangz1990/redis-3.0-annotated,pmem/redis,ncopa/redis,janekmi/redis,mengyou0304/redis,msn217/redis-3.0-annotated,weizijun/redis,SummonY/redis,pkdevbox/redis,mengyou0304/redis,fengshao0907/redis,ReadCode/redis-3.0-annotated,ksarch-saas/redis,gilala/redis,ipmobiletech/redis,riyan8250/redis,netroby/redis,taoguan/redis,seppo0010/redis,4396/redis,tanghaodong25/redis,Cisphyx/redis-websockets,jackyan/redis,xuguruogu/redis,miaoyc1989/redis-3.0-annotated,narma/redis,0x55/redis-3.0-annotated,tellapart/redis,moonbingbing/redis-3.0-annotated,alenslan/redis,yuzhangjob/redis-3.0-annotated-unstable,StevenTsai/redis,holstvoogd/redis,JoeWoo/redis,blackmady/redis,darksideofthemoo/redis-histogram,cusspvz/redis,antirez/redis,mengyou0304/redis,jbochi/redis,YongMan/redis,ttuna/msot-redis,linfangrong/redis,YuraLukashik/redis,slfs007/mk-redis,zguangyu/redis,NBSW/redis,zhcy/redis,4396/redis,SyntaxStacks/redis,MSOpenTech/redis,aim-for-better/redis,vincent-vivian-liu/redis,janekmi/redis,wprice/redis,pkdevbox/redis,zhiliaoniu/redis,jasonkying/redis,linfangrong/redis,wenxueliu/redis_comment,jermnelson/redis,Aaron1992/redis,mumingv/redis-3.0-annotated,HeartSaVioR/redis,HunanTV/redis,sunheehnus/redis,StevenTsai/redis,arijitvt/redis,aim-for-better/redis,tanghaodong25/redis,onlymellb/redis-3.0-annotated,pmem/redis,thomasdarimont/redis,linfangrong/redis,seppo0010/redis,a-pavlov/redis,NBSW/redis,universsky/redis,oranagra/redis,holstvoogd/redis,yybirdcf/learn-redis,PradheepShrinivasan/redis,arijitvt/redis,wuyu201321060203/redis-3.0-annotated,citusdata/redis,charsyam/redis,shining-yang/redis,riyan8250/redis