Date: Thu, 3 Jun 2010 19:27:33 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: bored to death <bored_to_death85@yahoo.com> Cc: freebsd-ipfw <freebsd-ipfw@freebsd.org> Subject: Re: traffic bandwidth limit with dummynet Message-ID: <20100603172733.GA16454@onelab2.iet.unipi.it> In-Reply-To: <247123.29322.qm@web59713.mail.ac4.yahoo.com> References: <247123.29322.qm@web59713.mail.ac4.yahoo.com>
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On Thu, Jun 03, 2010 at 09:29:20AM -0700, bored to death wrote: > hello, > > i'm trying to limit my input traffic bandwidth on freebsd. i used > ipfw+dummynet. without limitation, i have almost 1Gbit/s input traffic > on my system. when i try to limit the bandwidth, it works fine on low > to normal limitation number (up to 450 Mbit/s). > but when i limit my traffic to an amount bigger than 500MBit/s, my > input traffic lowers down to average of 430 MBit/s. no matter what > limitations i set(from 500MBit/s to 1000MBit/s) my input traffic rate > is getting stucked at 430MBit/s. try to run the kernel with higher value of HZ (in /boot/loader.conf kern.hz=4000 and see if the situation improves. I think the symptoms you are seeing depend on the fact that packets are released every 1/HZ seconds probably causing some queue overflow at high packet rates and [relatively] low HZ values. cheers luigi > i suspected low hardware performance, so i tried this on 2 different > systems with freebsd-8.0 and the result is exactly the same. > > my ipfw rules are: > > Code: > ipfw -q flush > ipfw -q add 500 set 1 pipe 1 all from any to any in > ipfw pipe 1 config bw 700Mbit/s > ipfw add 1000 allow all from any to anyso my question is: > 1- is ipfw+dummynet traffic limit control, has performance problem that > cannot limit traffic correctly if limitation number is bigger than > 500MBit/s? > 2- is there any other way (other than ipfw+dummynet) to limit input bandwidth in freebsd? > > thank you. > > > > _______________________________________________ > freebsd-ipfw@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw > To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org"
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