* Andrew Morton <[email protected]> wrote: > > And yes, by fairly, I mean fairly among all threads as a base > > resource class, because that's what Linux has always done > > Yes, there are potential compatibility problems. Example: a machine > with 100 busy httpd processes and suddenly a big gzip starts up from > console or cron. > > Under current kernels, that gzip will take ages and the httpds will > take a 1% slowdown, which may well be exactly the behaviour which is > desired. > > If we were to schedule by UID then the gzip suddenly gets 50% of the > CPU and those httpd's all take a 50% hit, which could be quite > serious. > > That's simple to fix via nicing, but people have to know to do that, > and there will be a transition period where some disruption is > possible. hmmmm. How about the following then: default to nice -10 for all (SCHED_NORMAL) kernel threads and all root-owned tasks. Root _is_ special: root already has disk space reserved to it, root has special memory allocation allowances, etc. I dont see a reason why we couldnt by default make all root tasks have nice -10. This would be instantly loved by sysadmins i suspect ;-) (distros that go the extra mile of making Xorg run under non-root could also go another extra one foot to renice that X server to -10.) Ingo - 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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