Mailinglist Archive: opensuse-factory (471 mails)

[Greg Freemyer <greg.freemyer@xxxxxxxxx>]

2009/6/7 Rastislav Krupanský <rastislav.krupansky@xxxxxxxxx>:
> 2009/6/7 Martin <martin.schlander@xxxxxxxxx>:
> > Lørdag den 6. juni 2009 17:34:08 skrev Rastislav Krupanský:
> > > 2009/6/5 Stephan Kulow <coolo@xxxxxxxxxx>:
> > > > > > I'm not sure, but it might already add to the puzzle why ubuntu is
> > > > > > faster for you. They don't have beagle and they use relatime by
> > > > > > default.
> > >
> > > I used relatime as is in the ubuntu's fstab and times are almost
> > > comparable. For Gimp it saved 5-6 seconds and also another apps start
> > > up faster ;-) Finally.
> > > It seems that relatime could fix it.
> > > So, what's next?
> >
> > I did some highly unscientific measurements with default fstab options, then
> > adding noatime and then realtime. Like this:
> >
> > /dev/disk/by-id/ata-FUJITSU_MHV2080BH_NW78T652BFEN-part2 /
> > ext3       acl,user_xattr        1 1
> >
> > /dev/disk/by-id/ata-FUJITSU_MHV2080BH_NW78T652BFEN-part2 /
> > ext3       noatime,acl,user_xattr        1 1
> >
> > /dev/disk/by-id/ata-FUJITSU_MHV2080BH_NW78T652BFEN-part2 /
> > ext3       realtime,acl,user_xattr        1 1
> >
> > For me (fresh user on 11.1/kde4.3beta) there's no real difference with any of
> > these fstab options.
> >
> > Cold start FF (3.0.10): 8-9s
> > Warm start FF: 1-2s
> >
> > Cold start Gimp (2.6.2): 12s
> > Warm start Gimp: 5-6s
> >
> >
> > On Mandriva 2009.0:
> >
> > Fstab looks like this:
> > UUID=7c2d957c-d69d-11dd-b9ef-c5218aa42eda / ext3 noatime 1 1
> >
> > Cold start FF (3.0.5): 4s
> > Warm start FF: 1s
> >
> > Cold start Gimp (2.4.7): 9s
> > Warm start Gimp: 3s
> >
> > What is the full fstab entry that you use to achieve those results with
> > realtime?
>
> Watch out. No realtime, but relatime. But i'm talking about ext4. I
> don't know whether relatime has any
> influence on ext3. But try it. For ext3 try to add noatime and disable 
> barriers.
>
> /dev/disk/by-id/ata-HTS424040M9AT00_MPA248Q2JL49AE-part1 / ext3
> acl,user_xattr,noatime,barrier=0 1 1
>
> have a look on this article
> http://vavai.net/2009/01/15/opensuse-tweak-increase-opensuse-speed-performance/
> and especially comment by Cristian Rodriguez
>
> Here you are my times. Everything are cold starts.
>
> relatime
>
> user@linux-pws2:~> time firefox %u
> real    0m7.497s
> user    0m1.148s
> sys     0m1.200s
>
> user@linux-pws2:~> time gimp
> real    0m16.019s
> user    0m3.468s
> sys     0m4.464s
>
> user@linux-pws2:~> time oowriter %U
> real    0m14.811s
> user    0m0.560s
> sys     0m3.072s
>
> user@linux-pws2:~> time gnome-control-center
> real    0m3.119s
> user    0m0.532s
> sys     0m0.700s
>
> noatime
>
> user@linux-pws2:~/Desktop> time firefox %u
> real    0m8.071s
> user    0m1.252s
> sys     0m0.956s
>
> user@linux-pws2:~/Desktop> time gimp
> real    0m19.466s
> user    0m3.880s
> sys     0m5.184s
>
> user@linux-pws2:~/Desktop> time oowriter %U
> real    0m27.235s
> user    0m0.756s
> sys     0m3.156s
>
> user@linux-pws2:~/Desktop> time gnome-control-center
> real    0m2.972s
> user    0m0.528s
> sys     0m0.464s
>
> Ubuntu
>
> user@user-desktop:~$ time firefox %u
> real    0m7.045s
> user    0m0.728s
> sys     0m1.016s
>
> user@user-desktop:~$ time gimp
> real    0m12.354s
> user    0m2.520s
> sys     0m3.532s
>
> user@user-desktop:~$ time ooffice -writer %F
> real    0m13.336s
> user    0m0.092s
> sys     0m0.892s
>
> user@user-desktop:~$ time gnome-control-center
> real    0m3.023s
> user    0m0.776s
> sys     0m0.504s
>
>
> --
> S pozdravom / Best regards,
>
> Rasto

So I think this is saying:

Currently OpenSUSE uses neither noatime, nor relatime as a default mount option.

Using noatime is the fastest option but it has too many cons associated with it.

Using relatime is observably faster than not using it, but not as fast
as noatime, but it has far fewer cons.

Does anyone know what cons using relatime as a default mount option would have?

Thanks
Greg
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