Hello
We know streaming services and NFS use UDP protocol.
This means IP defragmentation is processed heavily,
as their packets are very large.
We should allocate "incomplete detagram queue" using
kmem_cache_alloc() instead of kmalloc().
This is the patch against linux 2.5.15.
Thank you,
Hirokazu Takahashi.
--- linux/include/net/ip.h.ORG Tue May 14 03:32:55 2002
+++ linux/include/net/ip.h Tue May 14 06:32:41 2002
@@ -84,6 +84,7 @@
* Functions provided by ip.c
*/
+extern void ipfrag_init(void);
extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
u32 saddr, u32 daddr,
struct ip_options *opt);
--- linux/net/ipv4/ip_fragment.c.ORG Tue May 14 03:33:12 2002
+++ linux/net/ipv4/ip_fragment.c Thu May 16 02:24:43 2002
@@ -89,7 +89,7 @@
/* Hash table. */
-#define IPQ_HASHSZ 64
+#define IPQ_HASHSZ 128
/* Per-bucket lock is easy to add now. */
static struct ipq *ipq_hash[IPQ_HASHSZ];
@@ -128,6 +128,7 @@
atomic_t ip_frag_mem = ATOMIC_INIT(0); /* Memory used for fragments */
+static kmem_cache_t *iqp_cachep;
/* Memory Tracking Functions. */
static __inline__ void frag_kfree_skb(struct sk_buff *skb)
@@ -139,12 +140,12 @@
static __inline__ void frag_free_queue(struct ipq *qp)
{
atomic_sub(sizeof(struct ipq), &ip_frag_mem);
- kfree(qp);
+ kmem_cache_free(iqp_cachep, qp);
}
static __inline__ struct ipq *frag_alloc_queue(void)
{
- struct ipq *qp = kmalloc(sizeof(struct ipq), GFP_ATOMIC);
+ struct ipq *qp = kmem_cache_alloc(iqp_cachep, GFP_ATOMIC);
if(!qp)
return NULL;
@@ -628,4 +629,10 @@
IP_INC_STATS_BH(IpReasmFails);
kfree_skb(skb);
return NULL;
+}
+
+void __init ipfrag_init()
+{
+ iqp_cachep = kmem_cache_create("ipfragq",
+ sizeof(struct ipq), 0, SLAB_HWCACHE_ALIGN, 0, 0);
}
--- linux/net/ipv4/ip_output.c.ORG Tue May 14 03:33:19 2002
+++ linux/net/ipv4/ip_output.c Tue May 14 03:33:40 2002
@@ -1012,6 +1012,7 @@
ip_rt_init();
inet_initpeers();
+ ipfrag_init();
#ifdef CONFIG_IP_MULTICAST
proc_net_create("igmp", 0, ip_mc_procinfo);
-
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