PHK explained the cause of this is that the Linux kernel VM system performs poorly when overcomitted. https://news.ycombinator.com/item?id=10752209 https://new

PHK explained the cause of this is that the Linux kernel VM system performs poorly when overcomitted. https://news.ycombinator.com/item?id=10752209 https://news.ycombinator.com/item?id=10752209 So the conclusion is, as long your malloc fits in your system memory, Varnish should be blazing fast on Linux. If you need a gigantic cache, please try FreeBSD.