Nix wrote: >On 17 Jun 2006, Hans Reiser prattled cheerily: > > >>If the FS is called per page, then it turns out that 3) costs more than >>1) and 2) for sophisticated filesystems. As we develop fancier and >>fancier plugins this will just get more and more true. It decreases CPU >>usage by 2x to use per sys_write calls into reiser4 rather than per page >>calls into reiser4. >> >> > >This seems to me to be something that FUSE filesystems might well like, >too: I know one I'm working on would like to know the real size of the >original write request (so that it can optimize layout appropriately >for things frequently written in large chunks; the assumption being that >if it's written in large chunks it's likely to be read in large chunks >too). > > > Hi Nix, Forgive myn utter ignorance of fuse, but does it currently context switch to user space for every 4k written through VFS? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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