On Thu, Feb 21, 2008 at 9:55 AM, David Howells <dhowells@xxxxxxxxxx> wrote: > Daniel Phillips <phillips@xxxxxxxxx> wrote: > > > > Have you got before/after benchmark results? > > See attached. > > These show a couple of things: > > (1) Dealing with lots of metadata slows things down a lot. Note the result of > looking and reading lots of small files with tar (the last result). The > NFS client has to both consult the NFS server *and* the cache. Not only > that, but any asynchronicity the cache may like to do is rendered > ineffective by the fact tar wants to do a read on a file pretty much > directly after opening it. > > (2) Getting metadata from the local disk fs is slower than pulling it across > an unshared gigabit ethernet from a server that already has it in memory. Hi David, Your results remind me of this in case you're interested... http://www.citi.umich.edu/techreports/reports/citi-tr-92-3.pdf - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
