Troy Benjegerdes <hozer@xxxxxxxxx> wrote: > How big was the cachefs filesystem? Several Gig. I don't remember how big, but the disk I tried it on is totally kaput unfortunately. > Now try reading a 1GB file over nfs.. I'll give that a go at some point. However, I suspect that any size over twice the amount of pagecache available is going to scale fairly consistently until you start hitting the lid on the cache. I say twice because firstly you fill the pagecache with pages and start throwing them at the disk, and then you have to start on a rolling process of waiting for those to hit the disk before evicting them from the pagecache, which isn't going to get going smoothly until you've ejected the original load of pages. > I have found (with openafs), that I either need a really small cache, or > a really big one.. The bigger the openafs cache gets, the slower it > goes. The only place i run with a > 1GB openafs cache is on an imap > server that has an 8gb cache for maildirs. What filesystem underlies your OpenAFS cache? OpenAFS doesn't actually do its own file to disk management within the cache, but uses a host filesystem for that. David
