Hi Guys, Now we have a very small cluster with 3 OSDs but using 40Gb NIC. We use ceph-fuse as cephfs client and enable readahead, but testing single reading a large file from cephfs via fio, dd or cp can only achieve ~70+MB/s, even if fio or dd's block size is set to 1MB or 4MB. From the ceph client log, we found each read request's size (ll_read) is limited to 128KB, which should be the limitation of kernel fuse's FUSE_MAX_PAGES_PER_REQ = 32.
We may try to increase this value to see the performance difference, but are there other options we can try to increase single read performance? Thanks. Zhi Zhang (David)
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