* Betr.: " Fw: Bug#605009: serious performance regression with ext4" (Fri, 26
Nov 2010 22:15:06 +0100):
> * Betr.: " Re: Bug#605009: serious performance regression with ext4" (Fri, 26
> Nov 2010 16:33:06 +0100):
>
> > On Fri, 26 Nov 2010, Mathias Behrle wrote:
> > > * Betr.: " Re: Bug#605009: serious performance regression with ext4" (Fri,
> > > 26 Nov 2010 15:53:27 +0100):
> > >
> > > > That was ok everywhere except on ext4.
> > >
> > > JFTR: I am experiencing those problems as well on XFS.
> >
> > Can you give us figures to quantify the slowdown that you experience?
> > Please compare dpkg 1.15.8.5 and 1.15.8.6.
Finally some real numbers:
command:
time dpkg -i openjdk-6-doc_6b18-1.8.2-4_all.deb
1.15.8.6:
=========
dpkg 1.15.8.6 with force-unsafe-io (1. install):
real 8m12.093s
user 0m1.737s
sys 0m2.290s
dpkg 1.15.8.6 with force-unsafe-io (2. run = replace):
real 13m57.933s
user 0m1.657s
sys 0m3.596s
dpkg 1.15.8.6 without force-unsafe-io (3. run = replace):
real 19m50.008s
user 0m1.940s
sys 0m4.240s
1.15.8.5:
=========
dpkg 1.15.8.5 (4. run = replace):
real 15m13.063s
user 0m1.723s
sys 0m6.453s
Seems, that 1.15.8.5 performs much better than 1.15.8.6 (without
force-unsafe-io).
Filesystem:
/ xfs defaults,noatime,nodiratime,logbufs=8
on an lvm volume
Cheers,
--
Mathias Behrle
MBSolutions
Gilgenmatten 10 A
D-79114 Freiburg
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