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tcp_cubic: enable high resolution ack time if needed

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This is a refined version of an earlier patch by Lucas Nussbaum.
Cubic needs RTT values in milliseconds. If HZ < 1000 then
the values will be too coarse.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Reported-by: Lucas Nussbaum <lucas.nussbaum@loria.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2011-03-14 07:52:16 +00:00 committed by David S. Miller
parent 17a6e9f1aa
commit 3b585b3449
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/tcp_cubic.c
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@ -459,6 +459,10 @@ static int __init cubictcp_register(void)
/* divide by bic_scale and by constant Srtt (100ms) */
do_div(cube_factor, bic_scale * 10);
/* hystart needs ms clock resolution */
if (hystart && HZ < 1000)
cubictcp.flags |= TCP_CONG_RTT_STAMP;
return tcp_register_congestion_control(&cubictcp);
}