Commit 3b585b34 authored by stephen hemminger's avatar stephen hemminger Committed by David S. Miller

tcp_cubic: enable high resolution ack time if needed

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: default avatarStephen Hemminger <shemminger@vyatta.com>
Reported-by: default avatarLucas Nussbaum <lucas.nussbaum@loria.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 17a6e9f1
...@@ -459,6 +459,10 @@ static int __init cubictcp_register(void) ...@@ -459,6 +459,10 @@ static int __init cubictcp_register(void)
/* divide by bic_scale and by constant Srtt (100ms) */ /* divide by bic_scale and by constant Srtt (100ms) */
do_div(cube_factor, bic_scale * 10); 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); return tcp_register_congestion_control(&cubictcp);
} }
......
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