Hi folks, I would like to hear about your experience with the performance of XFS when used on NFS client mounted using Infininband RDMA connection on 3.4.11 kernel. What we observe is following: - we do have local RAID storage with 1.4GB/s read and write performance (both dd on raw partition and on xfs filesystem give basically the same performance) - we do have QDR Infiniband connection (Mellanox), the rdma benchmark gives 29Gbit/s throughput Now, both above points look pretty Ok but if we mount an nfs export using rdma on client we never get the 1.4GB/s throughput. Sporadically (and especially at the beginning) it comes up to some 1.3GB/s for short period but then it starts oscillating between 300MB/s and some 1.2GB/s with an average of 500-600MB/s. Even when using more clients in parallel, the net throughput behaves the same so it seems to be a server-side related bottleneck. We do not see any remarkable CPU load. The interesting point is, we use btrfs filesystem on server instead of xfs now (with otherwise same config) and we are getting consistent, steady throughput around 1.2-1.3GB/s. What is wrong with XFS on 3.x kernel ? Any hints what parameters to look at ? Samuel _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
