Varnish stuck on stresstest/approved by real traffic

Rogério Schneider stockrt at
Tue Nov 3 22:30:40 CET 2009


That is good to know that you have also experienced better performance
with patch from ticket 492.

I am replying this e-mail just to endorse your scenario. I have
already been in the same circumstance of Varnish getting stuck after a
bigger wave of simultaneous users.

What I did to solve the problem? Put more machines.

That would be great if we find the answer for this problem together.

About the unpatched version, I was not able to see if freeze like the
patched one because it hangs with another error before we can reach a
maximum of simultaneous users, like in this report:
This problem by itself was what lead me to make this patch/port for
epoll acceptor, since I use linux.

Rogério Schneider

2009/11/3 Václav Bílek <v.bilek at>:
> Václav Bílek napsal(a):
>> Hi
>> When testing varnish throughput and scalability I have found strange
>> varnish behavior.
>> using 2.0.4 with cache_acceptor_epoll.c  patch :
> without the patch there is no stuck but performace goes dramaticaly down
> on more than few thousands of connections.
> Vaclav Bilek
> _______________________________________________
> varnish-misc mailing list
> varnish-misc at

Rogério Schneider

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