On Fri, May 18, 2007 at 11:54:54AM +0200, Eric Dumazet wrote: > alloc_large_system_hash() is called at boot time to allocate space > for several large hash tables. > Lately, TCP hash table was changed and its bucketsize is not a > power-of-two anymore. > On most setups, alloc_large_system_hash() allocates one big page > (order > 0) with __get_free_pages(GFP_ATOMIC, order). This single > high_order page has a power-of-two size, bigger than the needed size. > We can free all pages that wont be used by the hash table. > On a 1GB i386 machine, this patch saves 128 KB of LOWMEM memory. > TCP established hash table entries: 32768 (order: 6, 393216 bytes)
The proper way to do this is to convert the large system hashtable users to use some data structure / algorithm other than hashing by separate chaining. -- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/