Re: Bandwidth constraint causing IIS/ASP.NET problem

Jack Fox wrote:
> We simulated too many clients, making requests faster than the
> bandwidth on that part of the network could consume the responses. It
> seems that the inability of the requestors to receive their responses
> causes IIS, and/or aspnet_wp.exe, to eventually max-out its threads
> and come to its knees.
> But.it seems that configuring more response load on the network than
> the bandwidth can handle is a type of denial of service attack against
> IIS/ASP.NET. How can we configure IIS and/or ASP.NET to prevent this?

It's hard to believe that you could have exceeded bandwidth limitations in
this scenario. It seems more likely that you stressed the box. However,
without some perfmon data, it's hard to say where you hosed yourself.

There are so many places where a performance problem can happen. If you're
in GC too much, you will see this kind of behavior. When we're in GC (or
when CPU reaches a certain threshold), new worker threads are not spun up to
handle requests. It's also possible that you might not have enough
completion port threads available. You also might not have enough worker
threads or too many worker threads.

Without details, it's impossible to say. However, there is a test you can
run. When you're bogged down, do HTML/ASP pages serve okay? If so, it's
likely something from paragraph 2. If not, something unrelated to ASP.NET
is going on.

--
Jim Cheshire
JIMCO Software
http://www.jimcosoftware.com

FrontPage add-ins for FrontPage 2000 - 2003




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