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Message-ID: <53EB5DE8.7030302@cogentembedded.com> Date: Wed, 13 Aug 2014 16:45:28 +0400 From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com> To: Vasily Averin <vvs@...allels.com>, netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>, "David S. Miller" <davem@...emloft.net> CC: Alexey Kuznetsov <kuznet@....inr.ac.ru> Subject: Re: [PATCH 1/2] cbq: incorrectly low bandwidth setting blocks limited traffic Hello. On 8/13/2014 4:38 PM, Vasily Averin wrote: > Mainstream commit f0f6ee1f70c4eaab9d52cf7d255df4bd89f8d1c2 have side effect: Please also specify that commit's summary line in parens. > if cbq bandwidth setting is less than real interface throughput > non-limited traffic can delay limited traffic for a very long time. > This happen because of q->now changes incorrectly in cbq_dequeue(): > in described scenario L2T is much greater than real time delay, > and q->now gets an extra boost for each transmitted packet. > Accumulated boost prevents update q->now, and blocked class can wait > very long time until (q->now >= cl->undertime) will be true again. > To fix the problem the patch updates q->now on each cbq_update() call. > L2T-related pre-modification q->now was moved to cbq_update(). > My testing confirmed that it fixes the problem and did not discovered Discover. > any side-effects. > Signed-off-by: Vasily Averin <vvs@...nvz.org> WBR, Sergei -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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