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authorNeal Cardwell <ncardwell@google.com>2012-04-10 07:59:20 +0000
committerDavid S. Miller <davem@davemloft.net>2012-04-10 14:47:09 -0400
commit18a223e0b9ec8979320ba364b47c9772391d6d05 (patch)
tree0028fe1163490ced0dcf3d72384fba0e37cf085e /MAINTAINERS
parent5fb84b1428b271f8767e0eb3fcd7231896edfaa4 (diff)
downloadlwn-18a223e0b9ec8979320ba364b47c9772391d6d05.tar.gz
lwn-18a223e0b9ec8979320ba364b47c9772391d6d05.zip
tcp: fix tcp_rcv_rtt_update() use of an unscaled RTT sample
Fix a code path in tcp_rcv_rtt_update() that was comparing scaled and unscaled RTT samples. The intent in the code was to only use the 'm' measurement if it was a new minimum. However, since 'm' had not yet been shifted left 3 bits but 'new_sample' had, this comparison would nearly always succeed, leading us to erroneously set our receive-side RTT estimate to the 'm' sample when that sample could be nearly 8x too high to use. The overall effect is to often cause the receive-side RTT estimate to be significantly too large (up to 40% too large for brief periods in my tests). Signed-off-by: Neal Cardwell <ncardwell@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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