Messages in this thread Patch in this message | | | Date | Wed, 11 Apr 2007 15:52:26 -0700 | From | Greg KH <> | Subject | [patch 20/31] Fix TCP slow_start_after_idle sysctl |
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-stable review patch. If anyone has any objections, please let us know.
------------------ From: David Miller <davem@davemloft.net>
[TCP]: slow_start_after_idle should influence cwnd validation too
For the cases that slow_start_after_idle are meant to deal with, it is almost a certainty that the congestion window tests will think the connection is application limited and we'll thus decrease the cwnd there too. This defeats the whole point of setting slow_start_after_idle to zero.
So test it there too.
We do not cancel out the entire tcp_cwnd_validate() function so that if the sysctl is changed we still have the validation state maintained.
Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- net/ipv4/tcp_output.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -943,7 +943,8 @@ static void tcp_cwnd_validate(struct soc if (tp->packets_out > tp->snd_cwnd_used) tp->snd_cwnd_used = tp->packets_out; - if ((s32)(tcp_time_stamp - tp->snd_cwnd_stamp) >= inet_csk(sk)->icsk_rto) + if (sysctl_tcp_slow_start_after_idle && + (s32)(tcp_time_stamp - tp->snd_cwnd_stamp) >= inet_csk(sk)->icsk_rto) tcp_cwnd_application_limited(sk); } } -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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