Index: sys/netinet/tcp_hostcache.c
===================================================================
--- sys/netinet/tcp_hostcache.c
+++ sys/netinet/tcp_hostcache.c
@@ -657,6 +657,7 @@
 		"    CWND SENDPIPE RECVPIPE HITS  UPD  EXP\n");
 
 #define msec(u) (((u) + 500) / 1000)
+	len = 0;
 	for (i = 0; i < V_tcp_hostcache.hashsize; i++) {
 		THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
 		TAILQ_FOREACH(hc_entry, &V_tcp_hostcache.hashbase[i].hch_bucket,
@@ -683,8 +684,17 @@
 			    hc_entry->rmx_hits,
 			    hc_entry->rmx_updates,
 			    hc_entry->rmx_expire);
+			if (++len >= 16) {
+				THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
+				sbuf_drain(&sb);
+				len = 0;
+				THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
+			}
 		}
 		THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
+		if (len > 0)
+			sbuf_drain(&sb);
+		len = 0;
 	}
 #undef msec
 	error = sbuf_finish(&sb);