[Beowulf] scratch File system for small cluster
atchley at myri.com
Thu Sep 25 10:58:59 EDT 2008
On Sep 25, 2008, at 10:19 AM, Joe Landman wrote:
> We have measured NFSoverRDMA speeds (on SDR IB at that) at 460 MB/s,
> on an RDMA adapter reporting 750 MB/s (in a 4x PCIe slot, so ~860 MB/
> s max is what we should expect for this). Faster IB hardware should
> result in better performance, though you still have to walk through
> the various software stacks, and they ... remove efficiency ...
> (nice PC way to say that they slow things down a bit :( )
Even though recent kernels allow rsize and wsize of 1 MB for TCP,
RPCRDMA only supports 32 KB. This will limit your throughput some
regardless of faster hardware.
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