diff --git a/core/lb_cql.c b/core/lb_cql.c
deleted file mode 100644
index 40f9efc..0000000
--- a/core/lb_cql.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/* Copyright (c) 2017. TIG developer. */
-
-#include <stdint.h>
-#include <sys/queue.h>
-
-#include <rte_cycles.h>
-#include <rte_hash.h>
-#include <rte_hash_crc.h>
-#include <rte_malloc.h>
-#include <rte_spinlock.h>
-
-#include "lb_cql.h"
-
-struct cql_entry {
-    TAILQ_ENTRY(cql_entry) next;
-    uint64_t time;
-};
-
-struct cql_rule {
-    uint32_t ip;
-    uint32_t qps;
-    rte_spinlock_t lock;
-    TAILQ_HEAD(, cql_entry) tbl;
-    struct cql_entry entries[0];
-};
-
-struct lb_cql {
-    struct rte_hash *h;
-    uint32_t size;
-    uint32_t socket_id;
-};
-
-static struct cql_rule *
-cql_rule_create(uint32_t ip, uint32_t qps, uint32_t socket_id) {
-    struct cql_rule *r;
-    uint32_t size;
-    uint32_t i;
-
-    size = sizeof(struct cql_rule) + qps * sizeof(struct cql_entry);
-    r = rte_zmalloc_socket(NULL, size, RTE_CACHE_LINE_SIZE, socket_id);
-    if (!r) {
-        return NULL;
-    }
-    r->ip = ip;
-    r->qps = qps;
-    rte_spinlock_init(&r->lock);
-    TAILQ_INIT(&r->tbl);
-    for (i = 0; i < qps; i++) {
-        TAILQ_INSERT_TAIL(&r->tbl, &r->entries[i], next);
-    }
-    return r;
-}
-
-static void
-cql_rule_free(struct cql_rule *r) {
-    rte_free(r);
-}
-
-static int
-cql_rule_enqueue(struct cql_rule *r, uint64_t time) {
-    struct cql_entry *e;
-
-    rte_spinlock_lock(&r->lock);
-    e = TAILQ_FIRST(&r->tbl);
-    if (e && (e->time + rte_get_tsc_hz() < time)) {
-        e->time = time;
-        TAILQ_REMOVE(&r->tbl, e, next);
-        TAILQ_INSERT_TAIL(&r->tbl, e, next);
-        rte_spinlock_unlock(&r->lock);
-        return 0;
-    }
-    rte_spinlock_unlock(&r->lock);
-    return -1;
-}
-
-static void
-__cql_rule_del(struct lb_cql *cql, uint32_t ip) {
-    struct cql_rule *r;
-
-    if (rte_hash_lookup_data(cql->h, (const void *)&ip, (void **)&r) >= 0) {
-        rte_hash_del_key(cql->h, (const void *)&ip);
-        cql_rule_free(r);
-    }
-}
-
-int
-lb_cql_rule_add(struct lb_cql *cql, uint32_t ip, uint32_t qps) {
-    struct cql_rule *r;
-
-    r = cql_rule_create(ip, qps, cql->socket_id);
-    if (!r) {
-        return -1;
-    }
-    __cql_rule_del(cql, ip);
-    if (rte_hash_add_key_data(cql->h, (const void *)&ip, r) < 0) {
-        cql_rule_free(r);
-        return -1;
-    }
-    return 0;
-}
-
-void
-lb_cql_rule_del(struct lb_cql *cql, uint32_t ip) {
-    __cql_rule_del(cql, ip);
-}
-
-int
-lb_cql_rule_iterate(struct lb_cql *cql, uint32_t *ip, uint32_t *qps,
-                    uint32_t *next) {
-    uint32_t *k;
-    struct cql_rule *r;
-    int pos;
-
-    pos = rte_hash_iterate(cql->h, (const void **)&k, (void **)&r, next);
-    if (pos >= 0) {
-        *ip = r->ip;
-        *qps = r->qps;
-    }
-    return pos;
-}
-
-int
-lb_cql_check(struct lb_cql *cql, uint32_t ip, uint64_t time) {
-    struct cql_rule *r;
-
-    if (rte_hash_lookup_data(cql->h, (const void **)&ip, (void **)&r) < 0) {
-        return 0;
-    }
-    return cql_rule_enqueue(r, time);
-}
-
-uint32_t
-lb_cql_size(struct lb_cql *cql) {
-    return cql->size;
-}
-
-struct lb_cql *
-lb_cql_create(const char *name, uint32_t size, uint32_t socket_id) {
-    struct lb_cql *cql;
-    struct rte_hash_parameters params = {0};
-
-    cql = rte_zmalloc_socket(NULL, sizeof(struct lb_cql), 0, socket_id);
-    if (!cql) {
-        return NULL;
-    }
-    cql->size = size;
-    cql->socket_id = socket_id;
-
-    params.name = name;
-    params.entries = size;
-    params.key_len = sizeof(uint32_t);
-    params.hash_func = rte_hash_crc;
-    params.socket_id = socket_id;
-    cql->h = rte_hash_create(&params);
-    if (!cql->h) {
-        rte_free(cql);
-        return NULL;
-    }
-    return cql;
-}
-
-void
-lb_cql_destory(struct lb_cql *cql) {
-    const void *k;
-    struct cql_rule *r;
-    uint32_t n = 0;
-
-    if (!cql) {
-        return;
-    }
-    while (rte_hash_iterate(cql->h, &k, (void **)&r, &n) >= 0) {
-        cql_rule_free(r);
-    }
-    rte_hash_free(cql->h);
-    rte_free(cql);
-}
-
diff --git a/core/lb_cql.h b/core/lb_cql.h
deleted file mode 100644
index b2cf45f..0000000
--- a/core/lb_cql.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* Copyright (c) 2017. TIG developer. */
-
-/* CQL: client query limit */
-
-#ifndef __LB_CQL_H__
-#define __LB_CQL_H__
-
-struct lb_cql;
-
-int lb_cql_rule_add(struct lb_cql *cql, uint32_t ip, uint32_t qps);
-void lb_cql_rule_del(struct lb_cql *cql, uint32_t ip);
-int lb_cql_rule_iterate(struct lb_cql *cql, uint32_t *ip, uint32_t *qps,
-                        uint32_t *next);
-int lb_cql_check(struct lb_cql *cql, uint32_t ip, uint64_t time);
-uint32_t lb_cql_size(struct lb_cql *cql);
-struct lb_cql *lb_cql_create(const char *name, uint32_t size, uint32_t socket_id);
-void lb_cql_destory(struct lb_cql *cql);
-
-#endif
-