Re: Where is the performance bottleneck?

[Al Boldi]

Holger Kiehl wrote:
> Why do I only get 247 MB/s for writting and 227 MB/s for reading (from the
> bonnie++ results) for a Raid0 over 8 disks? I was expecting to get nearly
> three times those numbers if you take the numbers from the individual
> disks.
>
> What limit am I hitting here?

You may be hitting a 2.6 kernel bug, which has something to do with 
readahead, ask Jens Axboe about it! (see "[git patches] IDE update" thread)
Sadly, 2.6.13 did not fix it either.

Did you try 2.4.31?

--
Al
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