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authorVlad Yasevich <vladislav.yasevich@hp.com>2008-10-08 17:18:39 -0400
committerDavid S. Miller <davem@davemloft.net>2008-10-08 17:18:39 -0400
commit8e1ee18c332e08bee9d8bd66e63cd564fbf17fc2 (patch)
tree8dace1db660d555eb6e020f301fdfe6cf6c05b80 /net/sctp/sm_make_chunk.c
parent3c689b7320ae6f20dba6a8b71806a6c6fd604ee8 (diff)
sctp: Rework the tsn map to use generic bitmap.
The tsn map currently use is 4K large and is stuck inside the sctp_association structure making memory references REALLY expensive. What we really need is at most 4K worth of bits so the biggest map we would have is 512 bytes. Also, the map is only really usefull when we have gaps to store and report. As such, starting with minimal map of say 32 TSNs (bits) should be enough for normal low-loss operations. We can grow the map by some multiple of 32 along with some extra room any time we receive the TSN which would put us outside of the map boundry. As we close gaps, we can shift the map to rebase it on the latest TSN we've seen. This saves 4088 bytes per association just in the map alone along savings from the now unnecessary structure members. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/sm_make_chunk.c')
-rw-r--r--net/sctp/sm_make_chunk.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 76726bcff3e9..6dd9b3ef33d0 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2288,8 +2288,9 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
2288 } 2288 }
2289 2289
2290 /* Set up the TSN tracking pieces. */ 2290 /* Set up the TSN tracking pieces. */
2291 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, 2291 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2292 asoc->peer.i.initial_tsn); 2292 asoc->peer.i.initial_tsn, gfp))
2293 goto clean_up;
2293 2294
2294 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 2295 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2295 * 2296 *