Marlon de Boer wrote: > Hi list, > > I'm trying to solve a problem with 3sec timeouts with tcp connections,we > are seeing these timeouts in both production and test environments. The > timeouts mainly occur from our webservers connecting to our mysql > backend. (about 450 webservers, connecting to somewhat 400 database > servers, serving 13 million pageviews per hour during busy hours). > I've found the cause, it has to do with the tcp backlog. I've raise the backlog in mysql via back_log = 8192 and in the kernel via echo 8192 > /proc/sys/net/core/somaxconn, and everything worked just fine. For some really high speed operational I also tuned net.ipv4.tcp_fin_timeout = 30 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 Kind regards Marlon de Boer System engineer for www.hyves.nl -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
