Dear Okajima:
Xavi Kpan
On Thu, Dec 3, 2009 at 1:22 PM, <[1][email protected]> wrote:
xavi kpan:
> Dear all:
>
> Â Â We use aufs to mount an ro rootfs(/usr/,/lib/...) and a writable
layer
> on it. both are ext3.
> Â Â The lmbench show that creation of file, deteting of files are only a
> half of the speed of the ext3.
> Â Â Any suggestion of it?
>
> Â Â And Since the the rootfs is readonly, could I change it to squashfs
to
> accelerate the read performance?
>
> Best Regards
>
> --
> a fan of Barcelona and Linux
Hello xavi,
If you expect aufs to enhance the speed of filesystem, maybe you are
wrong. Essentially aufs is an overhead of filesystem layers. But I am
tyring minimize the overhead and aufs has some configurations for that.
Read the aufs manual and configure, specify the options, then you will
get the best performance.
Squashfs is also an overhead because it decompress the contents of fs.
Generally every overhead has its pros and cons. In squashfs, you pay the
cpu cycles for decompression, but you get more disk space, for instance.
The overhead of aufs is similar. Even I implement the minimum overhead
and you configure to minize it, the overhead exists. But you will get
some features you need. If those features are less useful than its
overhead, then probably you don't need aufs. If you configure aufs and
specify some options, the performance will gain, but of cource you will
lose some features.
J. R. Okajima
--
a fan of Barcelona and Linux
References
1. mailto:[email protected]
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