On Jan 18, 2010, at 4:15 PM, Ken Brownfield wrote: > Ironically and IMHO, one of the barriers to Varnish scalability is its thread > model, though this problem strikes in the thousands of connections.
Agreed. In an early thread on varnish-misc in February 2008 I concluded that reducing thread_pool_max to well below the default value (to 16 threads/CPU) was instrumental in attaining maximum performance on high-hit-ratio workloads. (This was with Varnish 1.1; things may have changed since then but the theory remains.) Funny how there's always a tradeoff: Overcommit -> page-thrashing death Undercommit -> context-switch death :) --Michael _______________________________________________ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
