On Wed, 02 May 2007 18:34:20 +0400 Stanislav Kruchinin <stas@xxxxxxxxxxxx> wrote: > I wrote a simple patches for userland and kernel parts of u32 classifier: > iproute/tc/f_u32.c > linux/net/sched/cls_u32.c > > Now I can use filter table with 16384 entries. It's enough for O(1) operation, > but still not enough for using last two octets of IP address as a hash key. > Divisors 32768 and 65536 are not allowed due to insufficient kernel buffer > memory. > > Command > # tc filter add dev eth1 parent 1:0 prio 5 handle 2: protocol ip \ > u32 divisor 65536 > > gives "RTNETLINK answers: No buffer space available" instead of "Invalid divisor". > > The question is "How to increase the size of the kernel buffer space?". You probably are limited by the max kmalloc() size (131072 bytes) You might try to change include/linux/kmalloc_sizes.h to add/enable CACHE(262144) CACHE(524288) Or even better, change kmalloc/kzalloc/kfree to vmalloc/vfree variant - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
