netdev - Re: [PATCH] netem: fix rate extension and drop accounting

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Message-ID: <20120703220442.GC5064@nuttenaction>
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 ...
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