Le mercredi 30 mars 2011 Ã 13:17 +0100, Maxin John a Ãcrit :
> A quick observation from dmesg after placing printks in
> "net/ipv4/udp.c" for MIPS-malta
>
> CONFIG_BASE_SMALL : 0
> table->mask : 127
> UDP_HTABLE_SIZE_MIN : 256
>
> dmesg:
> ....
> ...
> TCP: Hash tables configured (established 8192 bind 8192)
> TCP reno registered
> CONFIG_BASE_SMALL : 0
> UDP hash table entries: 128 (order: 0, 4096 bytes)
> table->mask, UDP_HTABLE_SIZE_MIN : 127 256
> CONFIG_BASE_SMALL : 0
> UDP-Lite hash table entries: 128 (order: 0, 4096 bytes)
> table->mask, UDP_HTABLE_SIZE_MIN : 127 256
> NET: Registered protocol family 1
> ....
> ....
>
> printk(s) are placed in udp.c as listed below:
>
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 588f47a..ca7f6c6 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -2162,7 +2162,7 @@ __setup("uhash_entries=", set_uhash_entries);
> void __init udp_table_init(struct udp_table *table, const char *name)
> {
> unsigned int i;
> -
> + printk("CONFIG_BASE_SMALL : %d \n", CONFIG_BASE_SMALL);
> if (!CONFIG_BASE_SMALL)
> table->hash = alloc_large_system_hash(name,
> 2 * sizeof(struct udp_hslot),
> @@ -2175,6 +2175,8 @@ void __init udp_table_init(struct udp_table
> *table, const char *name)
> /*
> * Make sure hash table has the minimum size
> */
> + printk("table->mask, UDP_HTABLE_SIZE_MIN : %d %d
> \n",table->mask,UDP_HTABLE_SIZE_MIN);
> +
> if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) {
> table->hash = kmalloc(UDP_HTABLE_SIZE_MIN *
> 2 * sizeof(struct udp_hslot), GFP_KERNEL);
> ~
How much memory do you have exactly on this machine ?
alloc_large_system_hash() has no parameter to specify a minimum hash
table, and UDP needs one.
If you care about losing 8192 bytes of memory, you could boot with
"uhash_entries=256"
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