On Mon, 19 Mar 2007 12:27:40 -0700 Randy Dunlap <[EMAIL PROTECTED]> wrote:
> +The default vfs_cache_divisor value is 100 (like percent). However, for > +extremely large systems where a value of vfs_cache_pressure of less than > +1 percent is desirable, using a larger vfs_cache_divisor enables this wanted > +characteristic. The one-percent-granularity problem also applies to /proc/sys/vm/*dirty* and possibly other things. So any fix we do should be applicable to those as well. And I'm not really sure how we should do this. I do think that we should change the kernel so these knobs are internally higher-resolution. So, for example, we switch all the logic so that instead of these variables representing 1/100th, they instead represent 1/1000000th, for example. Then, we change the top-level /proc handler to do the 1/100th <-> 1/1000000th conversion. So the rest of the kernel doesn't have to know about it. The we duplicate all the relevant /proc knobs: cat /proc/sys/vm/dirty_ratio 30 cat /proc/sys/vm/hires-dirty_ratio/ 300000 Or we do something else ;) - 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/
