Re: osd crash when using rdma

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> 
> I gave up on this topic.. ceph does not properly support it. Even though
> it
> seems really promising.
> 
> Tested a ping on 40gbit with rdma ud which took for both ways 6us.
> 
> rdma rd i didnt got running (maybe my cards need some special
> threatment..).
> 
> tcp-ping at mtu 9000 took 20us
> tcp-ping at mtu 1500 took 36us
> 
> all measured against 4k blocksize.
> 
> so the transport is up to ~3-4 times faster by using rdma.
> 

How many % is that of a total read/write operation? Is there some sort overview what parts in a read/write action have what latency?




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