From: David Ahern <dsah...@gmail.com> Many commands convert device names to an index using ll_name_to_index and the reverse from an index to a name using ll_index_to_name.
At the moment both of the ll_ functions use the ioctl based helpers from glibc which involves opening socket, calling ioctl and then closing the socket on each device lookup. When using a batch file or dumping large number of routes this means the same device lookups can be done repeatedly adding unnecessary overhead to both operations. This series adds a new function, ll_link_get, to send a netlink based RTM_GETLINK. If successful, the result is cached in idx_head and name_head so future lookups can re-use the entry. iproute2's ll_map functions are updated to use ll_link_get over the glibc functions. The result is a significant speed up in both batch and dumps with negligible overhead if ip is invoked for single operations. The first 2 patches add a means to drop an entry from the cache and updates iplink_modify to use that new function to drop entries on device changes. This forces the cache to re-learn device information if a batch file has a mix of link set operations with other commands - such as adding a route. v2 - changed the second patch to drop cache entry on any link changes - added ll_link_get to index to name conversion improving dumps David Ahern (3): ll_map: Add function to remove link cache entry by index ip link: Drop cache entry on any changes Improve batch and dump times by caching link lookups include/ll_map.h | 1 + ip/iplink.c | 3 +++ lib/ll_map.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 69 insertions(+), 1 deletion(-) -- 2.11.0
