piping killing performance on 5.1-REL-p2
Luigi Rizzo
rizzo at icir.org
Sat Aug 16 02:58:49 PDT 2003
well... i don't understand what do you think is wrong here.
A 64-byte (512 bits) packet in a 10Kbit/s pipe will take roughly 50ms
to go through, and this is exactly what you are reporting.~
I suspect your 4.x configuration was not passing the packets
through the pipe and/or had the bandwidth configured differently.
[As an aside, by using "mask src-ip 0xffffffff" you are basically
making yourself a wonderful candidate for DoS attacks as
any IP will create a new pipe. I'd rather have one pipe (or a small
number of pipes) for outsider and if someone is saturating them
you'll still be able to provide service inside.
cheers
luigi
On Sat, Aug 16, 2003 at 01:16:21AM -0700, Peter Losher wrote:
> Hi -
>
> On several of our servers that provide name service to the local network,
> we normally have pipes in our ipfw/ipfw2 rules as such:
>
> add pipe 1 udp from any to any 53 in
> pipe 1 config mask src-ip 0xffffffff buckets 1024 bw 10Kbit/s queue 3
> add pipe 2 tcp from any to any 53 in
> pipe 2 config mask src-ip 0xffffffff buckets 1024 bw 100Kbit/s queue 3
>
> to make sure outsiders don't slam us too hard, etc... This setup has worked
> fine for us in the past under 4.x, but we have now turned up our first
> 5.1-REL box (5.1-REL-p2 to be exact) and while the pipes work, they are
> killing the response times. dig queries that normally take a couple of
> milliseconds from another host on the same subnet now take 40-50
> milliseconds. Remove the rules, and the response time goes back
> down to a couple of milliseconds. Note that this same configuration on a
> 4.x system shows very little degradation with the pipes on-line.
>
> Has the syntax changed between ipfw and ipfw2, and have others experienced
> this "slowness" issue. (I looked in the archives beforehand)
>
> Best Wishes - Peter
> --
> Peter_Losher at isc.org | ISC | OpenPGP 0xE8048D08 | "The bits must flow"
>
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