KTCPVSTCP負載均衡器

KTCPVS (Kernel TCP Virtual Server) 它可實現(xiàn)應用級負載平衡在Linux內(nèi)核，所謂7層切換。由于架空7層開關(guān)在用戶空間非常高，這是件好事，執(zhí)行它的核心內(nèi)，以避免間接的上下文切換和內(nèi)存復制的用戶空間與內(nèi)核空間。雖然可擴展性KTCPVS低于IPVS （ IP虛擬服務器） ，它是靈活的，因為要求的內(nèi)容是眾所周知的要求之前，將被重定向到一個服務器。

KTCPVS stands for Kernel TCP Virtual Server. It implements application-level load balancing inside the Linux kernel, so called Layer-7 switching. Since the overhead of layer-7 switching in user-space is very high, it is good to implement it inside the kernel in order to avoid the overhead of context switching and memory copying between user-space and kernel-space. Although the scalability of KTCPVS is lower than that of IPVS (IP Virtual Server), it is flexible, because the content of request is known before the request is redirected to one server.