Re: Swappiness vs. mmap() and interactive response

KOSAKI Motohiro
2009-05-06T11:05:31Z

> > test environment: no lvm, copy ext3 to ext3 (not mv), no change swappiness,
> > CFQ is used, userland is Fedora10, mmotm(2.6.30-rc1 + mm patch),
> > CPU opteronx4, mem 4G
> >
> > mouse move lag: not happend
> > window move lag: not happend
> > Mapped page decrease rapidly: not happend (I guess, these page stay in
> > active list on my system)
> > page fault large latency: happend (latencytop display >1200ms)
> >
> >
> > Then, I don't doubt vm replacement logic now.
> > but I need more investigate.
> > I plan to try following thing today and tommorow.
> >
> > - XFS
> > - LVM
> > - another io scheduler (thanks Ted, good view point)
> > - Rik's new patch
>
> hm, AS io-scheduler don't make such large latency on my environment.
> Elladan, Can you try to AS scheduler? (adding boot option "elevator=as")

second test result:
read dev(sda): SSD, lvm+XFS
write dev(sdb): HDD, lvm+XFS

the result is the same of ext3 without lvm. Thus I think
XFS isn't guilty.