Date: Fri, 23 Jan 2009 12:44:20 +0300 From: Oleg Bulyzhin <oleg@FreeBSD.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: stable@FreeBSD.org, re@FreeBSD.org Subject: Re: backporting dummynet's q_time change ? (svn 184414) Message-ID: <20090123094420.GC54838@lath.rinet.ru> In-Reply-To: <20090123092312.GC40642@onelab2.iet.unipi.it> References: <20090123081028.GA38763@onelab2.iet.unipi.it> <20090123085337.GB54838@lath.rinet.ru> <20090123092312.GC40642@onelab2.iet.unipi.it>
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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. ================================================================ === Oleg Bulyzhin -- OBUL-RIPN -- OBUL-RIPE -- oleg@rinet.ru === ================================================================
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