I have encountered a rather interesting issue with Ubuntu 14.04 LTS running 3.19.0-30 kernel (Vivid) using Ceph Hammer (0.94.3). With everything else identical in our testing cluster, no other changes other than the kernel (apt-get install linux-image-generic-lts-vivid and then a reboot), we are seeing a substantial drop in read performance as indicated with rados bench. Kernel 3.13.0.-65 (latest for Trusty): Read performance: 575MB/s Kernel 3.19.0-30 (Vivid): Read performance: 175MB/s Has anyone experienced this sort of performance drop? |
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