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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-11-30 01:10:55 +1100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2007-11-30 01:10:55 +1100 |
| commit | a357dde9df33f28611e6a3d4f88265e39bcc8880 (patch) | |
| tree | 181c8b1508a84ca30d32c779a508bb475fb96077 /net/sctp/sm_statefuns.c | |
| parent | 5e5234ff17ef98932688116025b30958bd28a940 (diff) | |
[TCP] illinois: Incorrect beta usage
Lachlan Andrew observed that my TCP-Illinois implementation uses the
beta value incorrectly:
The parameter beta in the paper specifies the amount to decrease
*by*: that is, on loss,
W <- W - beta*W
but in tcp_illinois_ssthresh() uses beta as the amount
to decrease *to*: W <- beta*W
This bug makes the Linux TCP-Illinois get less-aggressive on uncongested network,
hurting performance. Note: since the base beta value is .5, it has no
impact on a congested network.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'net/sctp/sm_statefuns.c')
0 files changed, 0 insertions, 0 deletions