rbd write rate

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hi,all
i have another rbd question,when i use rbd to wite a file to OSD
my configuration is : 4 OSDs 1MON 1MDS,linux kernel version is 2.6.37.6
and the average write rate is about 5MB/s.
when i look into the log in /var/log/kernel.log, and find that the
client get items from request_queue
with the write size between 1 page and 31 pages.
i think it results in the low write rate.am i right?
if not, please give me some advice?

thanks!
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