[zeromq-dev] Big Latencies

[Pasi Mankinen]

Aja Walker <Aja at ciscor.com> wrote:

> Hi all!
> 
> I posted this question about a week ago, but it was fairly long-winded, and there was some other deep, heated discussion going on so I thought I'd give it one more shot.  I hope I'm not offending the etiquette of the mailing list by re-posting, but if so, my apologies, and I won't do it again.  :)
> 
> The previous (overly?) detailed post is here:  http://lists.zeromq.org/pipermail/zeromq-dev/2012-February/015640.html
> 
> Briefly, I'm occasionally seeing big, as in 10 milliseconds, end-to-end latencies  on my Windows 7 machine, but not on my Linux machine.
> 
> In certain circumstances these big latencies are frequent rather than occasional, as in 80% of messages sent.
> 
> Has anyone else seen anything like this?
> 
> Sincerely,
> 
> Aja Walker

Hello. 

I had big performance problems with Apache APR (http://apr.apache.org/) based program. Setting registry values fixed performance problems. I don't think this is problem with zmq, but maybe you should test it? My tests with zqm were very small.

http://support.microsoft.com/kb/823764
"Slow performance occurs when you copy data to a TCP server by using a Windows Sockets API program."

--
Regards,

Pasi Mankinen
Finland