Infiniband RDMA
Hello,
would it be possible to get Infiniband support for membase and memcached?
This would reduce the latency dramatically to get the values out of membase/memcached.
Is there a plan to implement infiniband support?
By using infiniband tcp/ip someone could also use membase/memcached now, but there is a latency penalty by not use infiniband RDMA.
Yes, there is an fallback option for infiniband so it can be used with tcp/ip, but then you get a Performance penalty. But normally a roundtrip is done under 10 microseconds.
But when memcache hat a response time of 173 microseconds, I don't think infiniband would help that much:
http://www.facebook.com/note.php?note_id=39391378919
It would be interesting how much of these 173 microseconds is from network latency and how much is from pure memcache.
Do you have a statistic how fast you can get a response from membase in best case with membase installed on localhost?
Unfortunately I don't have that information specifically available...
From what I understand, the Ethernet network latency associated with a memcached request is extremely low. I would think that infiniband would allow much more bandwidth to be utilized, but I doubt it would really affect the round-trip latency of a single request.
Perry
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We typically develop RDMA programs now using the Linux RDMA Connection Manager (RDMA_CM). This uses the TCP/IP namespace via IPoIB to discover the native InfiniBand address of the endpoints. This makes life a lot simpler.
The RDMA tools on Linux have been developed to be data link transparent. Using them you can develop programs that will run over InfinBand or RDMA over Ethernet (RoCE) or iWARP.
We typically see latency in the 2-3 uS range using InfiniBad verbs. Whereas, a TCP stack over 10G Ethernet is typically 10uS slower. IPoIB is a similar speed, often slower than a good 10G Ethernet NIC.
There are some interesting performance statistics published by the CloudRAM team. They can achieve a data I/O in under 5uS into their CloudRAM store.
There's no current plan to offer direct support for Infiniband, but I'll make sure the request gets to our product management.
Does an Infiniband system provide an IP address that Membase can bind to?
Perry
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