On Mon, Oct 18, 2010 at 09:43:28AM +0200, David Naylor wrote: > Hi, > > I've used geom_sched to some success. Normally I do not notice anything but > today I was copying big files over a gigabit ethernet and my laptop was not > very responsive. I loaded gsched and the responsiveness improved (although > still rather bad for anything requiring something from the HDD). > > Thank you for all this work :-) > > Some questions I have: > > - with a gmirror should the gsched be attached to the underlying devices > (aka > /dev/ad?) or to the mirror device (aka /dev/mirror/?)?
always attach as close as possible to the hardware. > - is there anyway to automatically attach gsched to a device on startup > (i.e. > in rc.conf)? no, you have to build some script yourself. > > - is there a way to prioritise random IO (vs sequential reads from big > files)? no way to do that, but you can modify the quantum size and time to let sequential reads get shorter chunks kern.geom.sched.rr.quantum_kb: 8192 kern.geom.sched.rr.quantum_ms: 100 kern.geom.sched.rr.wait_ms: 10 e.g. on a laptop it might make sense to set quantum_ms=50 and quantum_kb=2048 > - gsched_as does not appear to be installed. true, gsched_as was just a proof of concept and gsched_rr includes anticipation and round robin, so it is a superset of gsched_as cheers luigi _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
