Varnish stuck on most served content

[Geoff Simmons]

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On 03/31/11 11:15 AM, Hettwer, Marian wrote:
>>>
>>> I'm running Centos 5.5 64bit and here's my varnish startup parameters:
>>>
>>> DAEMON_OPTS=" -a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \
>>>         -f ${VARNISH_VCL_CONF} \
>>>         -T 0.0.0.0:6082 \
>>>         -t 604800 \
>>>         -u varnish -g varnish \
>>>         -s malloc,54G \
>>>         -p thread_pool_add_delay=2 \
>>>                   -p thread_pools=16 \
>>>                   -p thread_pool_min=50 \
>>>                   -p thread_pool_max=4000 \
>>>         -p listen_depth=4096 \
>>>         -p lru_interval=600 \
>>>         -hclassic,500009 \
>>>         -p log_hashstring=off \
>>>         -p shm_workspace=16384 \
>>>         -p ping_interval=2 \
>>>         -p default_grace=3600 \
>>>         -p pipe_timeout=10 \
>>>         -p sess_timeout=6 \
>>>         -p send_timeout=10"
> 
> Hu. What are all those "-p" parameters? Looks like some heavy tweaking to
> me.
> Perhaps some varnish gurus might shime in, but to me tuning like that
> sounds like trouble.
> Unless you really know what you did there.
> 
> I wouldn't (not without the documentation at hands).

Um. Many of those -p's are roughly in the ranges recommended on the Wiki
performance page, and on Kristian Lyngstol's blog.

http://www.varnish-cache.org/trac/wiki/Performance
http://kristianlyng.wordpress.com/2009/10/19/high-end-varnish-tuning/

Perhaps one of the settings is causing a problem, but it isn't wrong to
be doing it all -- and it's quite necessary on a high-traffic site.


Best,
Geoff
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