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Date: Mon, 18 Mar 2013 08:06:08 +0100
From: Heinz Diehl <htd@fancy-poultry.org>
Message-ID: <20130318070608.GA1402@fancy-poultry.org>
References: <CAFnMBaSjtk+qPOMR=7QH5rvPpWhGG9ba-QwhOExPR587LbRVZw@mail.gmail.com>
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Subject: Re: [dm-crypt] unusual writing speeds when benchmark speeds are
 high enough
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To: dm-crypt@saout.de

On 17.03.2013, .. ink .. wrote: 

> 73400320 Bytes (73 MB) kopiert, 2,58497 s, 28,4 MB/s

Could you try a 

 blockdev --setra 8192 /dev/sda
 blockdev --setra 8192 /dev/sdb

and re-do the test?