Date: Wed, 25 Jun 2003 11:28:01 +0100 From: Andy Coates <andy@bribed.net> To: freebsd-ipfw@freebsd.org Subject: Re: ipfw bandwidth shaping problems (intermittent latency) Message-ID: <20030625102801.GM84062@andy.btvs.net> In-Reply-To: <20030625094802.GK84062@andy.btvs.net> References: <20030625094802.GK84062@andy.btvs.net>
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Andy Coates (andy@bribed.net) wrote: > Hi, > > Up until now I've been fairly happy with just using a simple pipe with: > > pipe 1 config bw 2400Kbit/s > > However recently under a more utilised link we start to see every third > packet or so have a higher latency than the rest. For example, an icmp > ping to the host would show 10ms, 10ms, and then 190ms, then back to 10ms > for another 2 pings and upto 190ms again. > > I decided to play with the queue settings, and tried: > > pipe 1 config bw 2400Kbit/s queue 15 > > This then brought that third ping down to 70ms, so an improvement. This > still isn't acceptable however, since the amount of bandwidth being used > is only 1000Kbit/s so I can't see where the problem is. > > Is there anything else I can change to improve the response/latency? Or > is this some type of bug? Just to clarify what I mean: 64 bytes from x.x.x.x: icmp_seq=0 ttl=248 time=70.803 ms 64 bytes from x.x.x.x: icmp_seq=1 ttl=248 time=3.850 ms 64 bytes from x.x.x.x: icmp_seq=2 ttl=248 time=3.551 ms 64 bytes from x.x.x.x: icmp_seq=3 ttl=248 time=123.844 ms 64 bytes from x.x.x.x: icmp_seq=4 ttl=248 time=3.759 ms 64 bytes from x.x.x.x: icmp_seq=5 ttl=248 time=3.600 ms 64 bytes from x.x.x.x: icmp_seq=6 ttl=248 time=3.507 ms 64 bytes from x.x.x.x: icmp_seq=7 ttl=248 time=3.687 ms 64 bytes from x.x.x.x: icmp_seq=8 ttl=248 time=3.594 ms 64 bytes from x.x.x.x: icmp_seq=9 ttl=248 time=3.527 ms 64 bytes from x.x.x.x: icmp_seq=10 ttl=248 time=23.543 ms 64 bytes from x.x.x.x: icmp_seq=11 ttl=248 time=123.615 ms 64 bytes from x.x.x.x: icmp_seq=12 ttl=248 time=3.637 ms 64 bytes from x.x.x.x: icmp_seq=13 ttl=248 time=3.661 ms 64 bytes from x.x.x.x: icmp_seq=14 ttl=248 time=103.323 ms 64 bytes from x.x.x.x: icmp_seq=15 ttl=248 time=13.101 ms 64 bytes from x.x.x.x: icmp_seq=16 ttl=248 time=3.569 ms 64 bytes from x.x.x.x: icmp_seq=17 ttl=248 time=23.151 ms 64 bytes from x.x.x.x: icmp_seq=18 ttl=248 time=92.962 ms 64 bytes from x.x.x.x: icmp_seq=19 ttl=248 time=3.555 ms 64 bytes from x.x.x.x: icmp_seq=20 ttl=248 time=43.122 ms 64 bytes from x.x.x.x: icmp_seq=21 ttl=248 time=72.781 ms 64 bytes from x.x.x.x: icmp_seq=22 ttl=248 time=3.547 ms 64 bytes from x.x.x.x: icmp_seq=23 ttl=248 time=122.583 ms 64 bytes from x.x.x.x: icmp_seq=24 ttl=248 time=42.509 ms 64 bytes from x.x.x.x: icmp_seq=25 ttl=248 time=3.540 ms 64 bytes from x.x.x.x: icmp_seq=26 ttl=248 time=52.660 ms Thats just plain odd to me. Andy.
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