Re: Performance issue with 2.6 md raid0

[Mattias Wadenstein]

On Fri, 6 Feb 2004, Nick Piggin wrote:

> Mattias Wadenstein wrote:
>
> >Greetings.
> >
> >While testing a file server to store a couple of TB in resonably large
> >files (>1G), I noticed an odd performance behaviour with the md raid0 in a
> >pristine 2.6.2 kernel as compared to a 2.4.24 kernel.
> >
> >When striping two md raid5:s, instead of going from about 160-200MB/s for
> >a single raid5 to 300M/s for the raid0 in 2.4.24, the 2.6.2 kernel gave
> >135M/s in single stream read performance.
>
> Can you try booting with elevator=deadline please?

Ok, then I get 253267 kB/s write and 153187 kB/s read from the raid0. A
bit better, but still nowhere near the 2.4.24 numbers.

For a single raid5, 158028 kB/s write and 162944 kB/s read.

/Mattias Wadenstein
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