On Jan 17, 2013, at 10:14 AM, Gandalf Corvotempesta <gandalf.corvotempesta@xxxxxxxxx> wrote: > 2013/1/17 Atchley, Scott <atchleyes@xxxxxxxx>: >> IPoIB appears as a traditional Ethernet device to Linux and can be used as such. Ceph has no idea that it is not Ethernet. > > Ok. Now it's clear. > AFAIK, a standard SDR IB card should give use more speed than GbE > (less overhead?) and lower latency, I think. Yes. It should get close to 1 GB/s where 1GbE is limited to about 125 MB/s. Lower latency? Probably since most Ethernet drivers set interrupt coalescing by default. Intel e1000 driver, for example, have a cluster mode that reduces (or turns off) interrupt coalescing. I don't know if ceph is latency sensitive or not. Scott-- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
