From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Furniss Date: Thu, 13 Jan 2005 13:05:24 +0000 Subject: Re: [LARTC] Slow large pings Message-Id: <41E67214.2070808@dsl.pipex.com> List-Id: References: <729574587.20050109133610@inbox.lv> In-Reply-To: <729574587.20050109133610@inbox.lv> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org kasp wrote: > Hello lartc, > > Testing some rules I found out that any rules are slowing down large pings! I can't reproduce this. > For example: > > tc qdisc add dev eth0 root handle 1: htb > tc class add dev eth0 parent 1: classid 1:1 htb rate 100Mbit prio 1 ceil 100Mbit > tc class add dev eth0 parent 1:1 classid 1:2 htb rate 100Mbit prio 2 ceil 100Mbit > tc filter add dev eth0 parent 1:0 prio 5 u32 \ Error for me unless I add protocol ip > match ip src 10.10.10.1 \ > match ip dst 10.10.10.10 \ > flowid 1:2 > tc qdisc add dev eth0 parent 1:2 handle 2: sfq perturb 10 > > Small pings are ok - <10ms, here is output for 65500 byte pings: 10ms is high I get 0.3 with p200mmx +rtl8139 + cheapest switch I could find + cables made without crimping tool. > > Pinging test [10.10.10.1] with 65500 bytes of data: > > Reply from 10.10.10.1: bytese500 time0ms TTLd > Reply from 10.10.10.1: bytese500 time0ms TTLd > Reply from 10.10.10.1: bytese500 time0ms TTLd > Reply from 10.10.10.1: bytese500 time0ms TTLd > I see 14ms > Ping statistics for 10.10.10.1: > Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), > Approximate round trip times in milli-seconds: > Minimum = 120ms, Maximum = 120ms, Average = 120ms > > If I don't use any rules, 65500 byte pings are about ~10ms > Any filters are slowing large pings for 10 times!!! > What can I do to tune it up? > What kernel and hardware are you using? Andy. _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/