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Date: Wed, 4 Jul 2012 00:04:43 +0200 From: Hagen Paul Pfeifer <hagen@...u.net> To: Eric Dumazet <eric.dumazet@...il.com> Cc: netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>, Andreas Terzis <aterzis@...gle.com>, Mark Gordon <msg@...gle.com> Subject: Re: [PATCH] netem: fix rate extension and drop accounting * Eric Dumazet | 2012-07-03 11:54:17 [+0200]: >> commit 7bc0f28c7a0c (netem: rate extension) did wrong maths when packet >> is enqueued while queue is not empty. >> >> Result is unexpected cumulative delays >> >> # tc qd add dev eth0 root est 1sec 4sec netem delay 200ms rate 100kbit >> # ping -i 0.1 172.30.42.18 >> PING 172.30.42.18 (172.30.42.18) 56(84) bytes of data. >> 64 bytes from 172.30.42.18: icmp_req=1 ttl=64 time=208 ms >> 64 bytes from 172.30.42.18: icmp_req=2 ttl=64 time=424 ms >> 64 bytes from 172.30.42.18: icmp_req=3 ttl=64 time=838 ms >> 64 bytes from 172.30.42.18: icmp_req=4 ttl=64 time=1142 ms >> 64 bytes from 172.30.42.18: icmp_req=5 ttl=64 time=1335 ms >> 64 bytes from 172.30.42.18: icmp_req=6 ttl=64 time=1949 ms >> 64 bytes from 172.30.42.18: icmp_req=7 ttl=64 time=2450 ms >> 64 bytes from 172.30.42.18: icmp_req=8 ttl=64 time=2840 ms >> 64 bytes from 172.30.42.18: icmp_req=9 ttl=64 time=3121 ms >> 64 bytes from 172.30.42.18: icmp_req=10 ttl=64 time=3291 ms >> 64 bytes from 172.30.42.18: icmp_req=11 ttl=64 time=3784 ms Strange, we test the patch in detail. I will take a look ... -- 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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