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net_sched: gen_estimator: account for timer drifts
authorEric Dumazet <edumazet@google.com>
Fri, 2 Dec 2016 16:11:00 +0000 (08:11 -0800)
committerDavid S. Miller <davem@davemloft.net>
Sat, 3 Dec 2016 21:12:17 +0000 (16:12 -0500)
commit12efa1fa43968fcb707e806dc119df499c17ac2c
tree1af0100515470e6aa6a942f0d13ff51529efbc81tree | snapshot
parente01b16a7e217a23eb97e08d0a591735d5aee5efccommit | diff
net_sched: gen_estimator: account for timer drifts

Under heavy stress, timer used in estimators tend to slowly be delayed
by a few jiffies, leading to inaccuracies.

Lets remember what was the last scheduled jiffies so that we get more
precise estimations, without having to add a multiply/divide in the loop
to account for the drifts.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/gen_estimator.c diff | blob | history
Domain: System / Kernel;