I seem to remember discussion of anticipatory vs deadline scheduler in 2.6. Here is what Andrew Morton (I think) says:
"The deadline scheduler has two additional scheduling queues that were not available to the 2.4 IO scheduler. The two new queues are a FIFO read queue and a FIFO write queue. This new multi-queue method allows for greater interactivity by giving the read requests a better deadline than write requests, thus ensuring that applications rarely will be delayed by read requests. Deadline scheduling is best suited for database servers and high disk performance systems. Morton has experienced up to 15 percent increases on database loads while using deadline scheduling." http://story.news.yahoo.com/news?tmpl=story&cid=75&e=2&u=/nf/20040405/tc_nf/23603 Nothing very in-depth in the story. -- Richard Huxton Archonet Ltd ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
