[rbldnsd] Possible Small Bug

[Jeff Chan]

On Friday, January 28, 2005, 9:27:51 AM, Jon Lewis wrote:
> On Fri, 28 Jan 2005, Jeff Chan wrote:

>> On Friday, January 28, 2005, 7:40:02 AM, David Hart wrote:
>> > BTW, we added a virtual domain that had been terribly abused. Yesterday
>> > rbldnsd rejected close to 3,000 spams without breaking a sweat - never
>> > even showing up in "top."
>>
>> FWIW 3000 is nothing.  I don't know what the practical limits for
>> rbldnsd are, but I suspect they are 3 or 4 orders of magnitude
>> greater, depending on the particular boxen.

> It's hard to make any load comparisons based on "blocked 3000 spams/day"
> since you don't know how many queries rbldnsd handled with negative
> answers.

I had heard of some studies where each message generated a dozen
or two DNS lookups and figured that in.  Call it a dozen for 0.42
qps and my guess of 3 or 4 orders of magnitude perhaps seems
reasonable.

> But...I'm seeing PII/PIII Celeron 400-500mhz systems handling >1300qps and
> rbldnsd keeps on trucking.

Thanks for the benchmark; most of our own servers are a bit
faster, and we're doing about 50 qps, so it's good to know we
have some headroom. 

Jeff C.
-- 
Jeff Chan
mailto:jeffc at surbl.org
http://www.surbl.org/