Hi Jinge!
I believe you are facing 2 different issues here. > Today, our haproxy CPU grow to 100%. And the machine become terribly slow. Please upgrade to recent 1.4 code, you are missing a a few fixes, including one a security fix. I suggest the snapshot 20130427 which also includes a loop fix (causing 100% load from haproxy). Download at [1]. > [1297314.773541] cleanup rbuf bug: copied DBE7B6DA seq DBE7B3C8 rcvnxt > DBE7B6DA > [...] > [1297314.773625] [<ffffffff81046a75>] ? warn_slowpath_common+0x78/0x8c This is a kernel issue with tcp splicing and has probably been fixed. Please see [2]. Not sure if Debian is backporting this fix though. You could just disable tcp splicing as a intermediate workaround. Cheers, Lukas [1] http://haproxy.1wt.eu/download/1.4/src/snapshot/ [2] http://comments.gmane.org/gmane.linux.network/231555
