On Tue, 2005-03-01 at 16:04, Bryan Henderson wrote: > >it is hard to beat linux kernel [page] cache performance though. > > It's quite easy to beat it for particular applications. You can use > special knowledge about the workload to drop pages that won't be accessed > soon in favor of pages that will, not clean a page that's just going to > get discarded or overwritten soon, allocate less space to less important > data, and on and on. u are talking about application aware caching/prefetching stuff. but i prefer to modifying kernel page cache a little bit while make use of most of the code there.
> > And that's pretty much the whole argument for direct I/O. Sometimes the > code above the filesystem layer is better at caching. > > Of course, in this thread we're not talking about beating the page cache > -- we're just talking about matching it, while reaping other benefits of > user space code vs kernel code. > yes, we went too far. > -- > Bryan Henderson IBM Almaden Research Center > San Jose CA Filesystems - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
