hanging connections

Stig Bakken stig at zedge.net
Tue Dec 21 10:03:55 CET 2010

Understood (of course).  I'll assemble the information needed.

 - Stig

On Tue, Dec 21, 2010 at 9:51 AM, Kristian Lyngstol <
kristian at varnish-software.com> wrote:

> On Tue, Dec 21, 2010 at 09:36:14AM +0100, Stig Bakken wrote:
> > Kristian, please let me know whether I should file a ticket for this.
> So far I haven't seen anything that suggests a bug.
> A single slow response is all the logs show - for better or worse. That
> could just as well just be a slow client or packet loss.
> What I need to be able to determine if this is a bug in Varnish,
> network-issue or phase-of-moon glitch is:
> - Several occurrences of slow responses and the requests around it in
>  varnishlog (you can obfuscate the IP - but I need to be able to tell
>  which requests come from the same IP: ie: if there are two IP's, A.A.A.A
>  and B.B.B.B are ok, but X.X.X.X for both are not).
> - 'varnishstat -1' output
> - 'sysctl -a' output
> - Network configuration on the machine(s), specially with regards to any
>  load balancers
> - 'dmesg'
> - Complete VCL (I do believe I already have that)
> - All start-up parameters. Any other running services on the machines.
> If that doesn't reveal the nature issue, I'll need to see tcpdump-output of
> the incident to track it further - at that point, obfuscation is not
> practically possible without risking the integrity of the data.
> In short: all you can give me.
> The issue doesn't have an obvious explanation and there isn't really any
> reason why a cache hit would take any real amount of time when we rule out
> busy objects. I should also point out that I can only really spend time on
> this to rule out or confirm if it is a varnish bug or not.
> --
> Kristian Lyngstøl
> Product Specialist
> Varnish Software
> Version: GnuPG v1.4.10 (GNU/Linux)
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> =Jmur

Stig Bakken
CTO, Zedge.net - free your phone!
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