On Sun, 2003-07-06 at 03:58, Marc-Christian Petersen wrote:
> On Friday 04 July 2003 23:37, Chris Mason wrote:
> 
> Hi Chris,
> 
> > > If the IO fairness still doesnt
> > > get somewhat better for general use (well get isolated user reports and
> > > benchmarks for both the two patches), then I might consider the q->full
> > > patch (it has throughtput drawbacks and I prefer avoiding a tunable
> > > there).
> now there is io-stalls-10 in .22-pre3 (lowlat elev. + fixpausing). Could you 
> please send "q->full patch" as ontop of -pre3? :-)

Attached, this defaults to q->full off and keeps the elvtune changes. 
So to turn on the q->full low latency fixes, you need to:

elvtune -b 1 /dev/xxxx

Note that for lvm and md, you need to elvtune each underlying device. 
Running it on an lvm/md device doesn't do anything.

-chris