From 024247317d50ffc4c44dd041aae19ae23b72788e Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Mon, 9 Jul 2012 09:55:26 +0100 Subject: [arp] Try to avoid discarding ARP cache entries Discarding the active ARP cache entry in the middle of a download will substantially disrupt the TCP stream. Try to minimise any such disruption by treating ARP cache entries as expensive, and discarding them only when nothing else is available to discard. Signed-off-by: Michael Brown --- src/include/ipxe/malloc.h | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'src/include') diff --git a/src/include/ipxe/malloc.h b/src/include/ipxe/malloc.h index c435a7ddb..d41b05628 100644 --- a/src/include/ipxe/malloc.h +++ b/src/include/ipxe/malloc.h @@ -76,6 +76,17 @@ struct cache_discarder { #define CACHE_DISCARDERS __table ( struct cache_discarder, "cache_discarders" ) /** Declare a cache discarder */ -#define __cache_discarder __table_entry ( CACHE_DISCARDERS, 01 ) +#define __cache_discarder( cost ) __table_entry ( CACHE_DISCARDERS, cost ) + +/** @defgroup cache_cost Cache discarder costs + * + * @{ + */ + +#define CACHE_CHEAP 01 /**< Items with a low replacement cost */ +#define CACHE_NORMAL 02 /**< Items with a normal replacement cost */ +#define CACHE_EXPENSIVE 03 /**< Items with a high replacement cost */ + +/** @} */ #endif /* _IPXE_MALLOC_H */ -- cgit v1.2.3-55-g7522