 | | Re: Why the dramatic increase in filesystem performance when
usingxfs???? | Re: Why the dramatic increase in filesystem performance when
usingxfs???? 2005-01-21 - By Arjan van de Ven
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> As the xfs performance comes back about twice the performance of ext3
> for this test I am of the opinion that xfs must be cheating somehow. It
> has always been my opinion that the IO bottleneck is the hardware and
> not the filesystem hence changing the filesystem but using the same
> hardware should not make a huge difference to performance (you still
> have to get the same amount of data out to disk at the end of the day)
>
> I am struggling to comprehend how xfs can cheat, though, as it can't
> cache such a huge file as there is not enough memory. Is it perhaps
> cheating because the file is comprised entirely of zero's?
>
> Can someone please enlighten me
are you sure you are using the same journaling mode?
by default ext3 uses a more strict journaling mode.
You can mount your filesystem with the "data=writeback" mount option to
get a similar journaling mode to XFS.
EXT3 makes a default tradeoff here between throughput and data safety
that is more towards data safety than XFS uses. The data=writeback mount
option changes that to be the same for both.
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