backporting dummynet's q_time change ? (svn 184414)

Oleg Bulyzhin oleg at FreeBSD.org
Fri Jan 23 01:44:22 PST 2009


On Fri, Jan 23, 2009 at 10:23:12AM +0100, Luigi Rizzo wrote:

> this is also in RELENG_7 but i am not sure whether this workaround
> has any drawback e.g., when curr_time passes a 32-bit boundary
> there seems to be an incorrect setting of q->numbytes

Workaround is fine in average. It may fail for:
1) _very_ idle flow (more than 2^32 ticks) while calculating q->avg
2) any flow once per 2^32 ticks
then q_time will be updated and things will be ok again.

-- 
Oleg.

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=== Oleg Bulyzhin -- OBUL-RIPN -- OBUL-RIPE -- oleg at rinet.ru ===
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