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Re: Bug#605009: serious performance regression with ext4

On 29.11.2010 14:41, Michael Biebl wrote:
> On 29.11.2010 07:18, Guillem Jover wrote:
>> Could someone with ext4/btrfs/xfs/etc test w/ and w/o the attached patch
>> against dpkg?
> I'm using ext4 (as already mentioned), my small benchmark is (re)installing
> vim-runtime using dpkg -i

Same test on an xfs partition
real    0m22.494s
user    0m3.384s
sys     0m1.312s
real    0m48.842s
user    0m3.360s
sys     0m1.696s (force-unsafe-io):
real    0m18.967s
user    0m3.412s
sys     0m1.144s (w/ patch posix_fadvise):
real    0m48.524s
user    0m3.872s
sys     0m1.892s

Looks like POSIX_FADV_DONTNEED has no effect on xfs.
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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