TIME_WAITs and sustained connections was: Re: Memcached module -- unix domain socket support? (too man

István Szukács leccine at gmail.com
Fri Aug 8 12:44:50 MSD 2008

what is the operating system?
what do you mean tweaked(details pls.)?


On Fri, Aug 8, 2008 at 7:01 AM, Kon Wilms <konfoo at gmail.com> wrote:

> On Thu, Aug 7, 2008 at 11:03 AM, Chavelle Vincent <lists at ruby-forum.com>
> wrote:
> > Kon Wilms wrote:
> >> I have a pool of memcached servers running on localhost with
> >> connection to nginx, feeding motion jpeg data out via static JPEGs to
> >> a flash application. The load is pretty high on the server because of
> >> this with each client running 3 GETs from memcached every second (i.e.
> >> 3fps).
> >> Cheers
> >> Kon
> >
> > How do you think about use ncache module instead of memcached ? I'm
> > definitly not an expert but when I read your post, it's the idea that I
> > have had.
> From what I read ncache works by caching items from disk into memory.
> The problem I have is that the media is changing every 250ms.
> Anyway an update, I have tweaked the kernel IPV4 parameters and even
> though I have at times 23,000 TIME_WAITs, they are now being recycled.
> The server is sustaining about 50Mbits of traffic going through
> memcached->nginx. My connection count hovers around 220 when using
> nginx_stats module. Is this the norm? I am wondering if I have an
> artificial bottleneck somewhere?
> Looking more into the unix domain sockets I am not sure if this would
> be the most pertinent solution to the problem. I noticed there was
> some talk on persistent connections to upstream servers -- is this
> planned for memcached (I am using this model on the app server side to
> feed memcached and it is working great)?
> Cheers
> Kon

the sun shines for all
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