Hi, That is useful to know Specifically I'm looking to use HAProxy in front of a cluster of backend servers, with lots of long running connections.
I keep hearing references on Linux to 65K max sockets, implying about 30k max connections (2 sockets per connection - one in and one out?). This is not going to be enough for us :( But I'm struggling to find out if this 65k thing is a fact or a myth. I found some references suggesting it was per process not per host. What (roughly) architecture was the 150k connection experience you mentioned running on? On 4 June 2010 09:19, Willy Tarreau <[email protected]> wrote: > On Thu, Jun 03, 2010 at 11:24:55AM -0600, Jason J. W. Williams wrote: > > Hi Laurie, > > > > This thread might be helpful: > > http://www.mail-archive.com/[email protected]/msg00926.html > > yes indeed, there are various tuning knobs depending on the OS. > Also, haproxy needs to be set up with the appropriate global > maxconn setting. I'd say that there are several use ranges : > > - below 500 concurrent connections (< 1000 total sockets) > => can be launched by any non-privileged user, useful for testing. > > - between 500 and a few thousands (2-3000) : generally requires root > privileges, but not much sensible to tuning nor OS optimisations > (eg: epoll/kqueue). > > - between a few thousands and a few tens of thousands (30-40000) : > really requires fine tuning (source ports, socket buffers, etc) > and system-specific optimisations (epoll/kqueue). > > - above : application-specific, must be purposedly built. The > performance will greatly depend on the workload, traffic type, > packet sizes, etc... and the required tuning will indicate a > minimal sizing and sometimes an architecture. I've seen up to > 150000 connections per machine once, but this was reached via > trial and error. > > Regards, > Willy > > -- Dr Laurie Young Scrum Master New Bamboo Follow me on twitter: @wildfalcon Follow us on twitter: @newbamboo Creating fresh, flexible and fast-growing web applications is our passion. 3rd Floor, Gensurco House, 46A Rosebery Avenue, London, EC1R 4RP http://www.new-bamboo.co.uk
