Date: Tue, 20 Aug 2002 00:38:16 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Carlos Carnero <zopewiz@yahoo.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Bandwidth throttling with dummynet(4) Message-ID: <20020820003816.A44103@iguana.icir.org> In-Reply-To: <20020820013634.3113.qmail@web21410.mail.yahoo.com>; from zopewiz@yahoo.com on Mon, Aug 19, 2002 at 06:36:34PM -0700 References: <20020819154141.A41050@iguana.icir.org> <20020820013634.3113.qmail@web21410.mail.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Aug 19, 2002 at 06:36:34PM -0700, Carlos Carnero wrote: > Hello, > > > dummynet pipes use timers heavily, and i suspect > > that the timer granularity in vmware might not be > > as good as you would want > > yes, you're right. I changed some thing though: > increased HZ in the kernel config from 1000 to 1500; > and currently I'm running the virtual machine at a > higher priority. Luckily I have a very fast host with > lots of RAM. 1500 vs 1000 won't help much -- events will be scheduled with the host system's timer granularity, which might well be low (100-128 or so for NT). Secondly, you are running two virtual machines, so i believe they will compete for resources causing the timing to be flaky. Anyways, on real boxes dummynet does work as expected at those rates. cheers luigi > > I'll play more with the slots, but those speeds (~ > 5KByte/s) are the ones that the real thing will use. > I'm building a router for a friend that has to share a > 256KBit/s link among 100 people :o > > I know that VMware is not exactly the best thing to > test dummynet, but right now I have no other choice. > It's an experience anyway. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020820003816.A44103>