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authorHiroaki SHIMODA <shimoda.hiroaki@gmail.com>2012-05-30 12:25:19 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-31 18:18:16 -0400
commit25426b794efdc70dde7fd3134dc56fac3e7d562d (patch)
tree800ef2d96fbf9cc6e8973d517f714edbda6b4fc2 /net/core
parent0cfd32b736ae0c36b42697584811042726c07cba (diff)
bql: Avoid unneeded limit decrement.
When below pattern is observed, TIME dql_queued() dql_completed() | a) initial state | | b) X bytes queued V c) Y bytes queued d) X bytes completed e) Z bytes queued f) Y bytes completed a) dql->limit has already some value and there is no in-flight packet. b) X bytes queued. c) Y bytes queued and excess limit. d) X bytes completed and dql->prev_ovlimit is set and also dql->prev_num_queued is set Y. e) Z bytes queued. f) Y bytes completed. inprogress and prev_inprogress are true. At f), according to the comment, all_prev_completed becomes true and limit should be increased. But POSDIFF() ignores (completed == dql->prev_num_queued) case, so limit is decreased. Signed-off-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com> Cc: Tom Herbert <therbert@google.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Denys Fedoryshchenko <denys@visp.net.lb> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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