diff -Naur iproute2/tc/q_htb.c iproute2-new/tc/q_htb.c
--- iproute2/tc/q_htb.c	2009-01-22 11:10:36.000000000 +0200
+++ iproute2-new/tc/q_htb.c	2009-01-22 11:31:40.000000000 +0200
@@ -110,6 +110,7 @@
 	unsigned mtu;
 	unsigned short mpu = 0;
 	unsigned short overhead = 0;
+	unsigned int bursthz;
 	unsigned int linklayer  = LINKLAYER_ETHERNET; /* Assume ethernet */
 	struct rtattr *tail;
 
@@ -209,9 +210,16 @@
 	if (!opt.ceil.rate) opt.ceil = opt.rate;
 
 	/* compute minimal allowed burst from rate; mtu is added here to make
-	   sute that buffer is larger than mtu and to have some safeguard space */
-	if (!buffer) buffer = opt.rate.rate / get_hz() + mtu;
-	if (!cbuffer) cbuffer = opt.ceil.rate / get_hz() + mtu;
+	   sure that buffer is larger than mtu and to have some safeguard space 
+	   With hrtimers enabled, hz variable gets too high resolution. If we
+	   use it for computing burst, burst will be too low. In worst case 
+	   we will not reach specified rate/ceil, in best - load will be too 
+	   high.
+	*/
+	bursthz = get_hz() == 1000000000 ? 1000 : get_hz();	
+
+	if (!buffer) buffer = opt.rate.rate / bursthz + mtu;
+	if (!cbuffer) cbuffer = opt.ceil.rate / bursthz + mtu;
 
 	opt.ceil.overhead = overhead;
 	opt.rate.overhead = overhead;