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| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2007-02-27 10:09:49 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:23:23 -0700 |
| commit | 3cfe3baaf07c9e40a75f9a70662de56df1c246a8 (patch) | |
| tree | 989b2aff491b5df3aa0215f611a8c7f1360c67e9 /include | |
| parent | c5e7af0df5d7234afd8596560d9f570cfc6c18bf (diff) | |
| download | linux-3cfe3baaf07c9e40a75f9a70662de56df1c246a8.tar.gz linux-3cfe3baaf07c9e40a75f9a70662de56df1c246a8.tar.bz2 linux-3cfe3baaf07c9e40a75f9a70662de56df1c246a8.zip | |
[TCP]: Add two new spurious RTO responses to FRTO
New sysctl tcp_frto_response is added to select amongst these
responses:
- Rate halving based; reuses CA_CWR state (default)
- Very conservative; used to be the only one available (=1)
- Undo cwr; undoes ssthresh and cwnd reductions (=2)
The response with rate halving requires a new parameter to
tcp_enter_cwr because FRTO has already reduced ssthresh and
doing a second reduction there has to be prevented. In addition,
to keep things nice on 80 cols screen, a local variable was
added.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sysctl.h | 1 | ||||
| -rw-r--r-- | include/net/tcp.h | 3 |
2 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index 98e0fd241a25..c9ccb550206f 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -439,6 +439,7 @@ enum NET_TCP_AVAIL_CONG_CONTROL=122, NET_TCP_ALLOWED_CONG_CONTROL=123, NET_TCP_MAX_SSTHRESH=124, + NET_TCP_FRTO_RESPONSE=125, }; enum { diff --git a/include/net/tcp.h b/include/net/tcp.h index 6d09f5085f6a..f0c9e3400a09 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -220,6 +220,7 @@ extern int sysctl_tcp_app_win; extern int sysctl_tcp_adv_win_scale; extern int sysctl_tcp_tw_reuse; extern int sysctl_tcp_frto; +extern int sysctl_tcp_frto_response; extern int sysctl_tcp_low_latency; extern int sysctl_tcp_dma_copybreak; extern int sysctl_tcp_nometrics_save; @@ -738,7 +739,7 @@ static inline void tcp_sync_left_out(struct tcp_sock *tp) tp->left_out = tp->sacked_out + tp->lost_out; } -extern void tcp_enter_cwr(struct sock *sk); +extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh); extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst); /* Slow start with delack produces 3 packets of burst, so that |