rbd speed: write vs read

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Hi!

root@stb1:~# dd if=/dev/zero of=/dev/rbd0 bs=10240000
^C13217+0 records in
13217+0 records out
135342080000 bytes (135 GB) copied, 1135.75 s, 119 MB/s

root@stb1:~# dd if=/dev/rbd0 of=/dev/null bs=10240000
^C930+0 records in
929+0 records out
9512960000 bytes (9.5 GB) copied, 394.773 s, 24.1 MB/s

It's my misconfiguration?

P.S. 20 OSD servers, 2*1G ether.

WBR,
    Fyodor.
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