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Hmm pretty odd. When I ran test on ceph kernel vs ceph fuse , FUSE has always been slower for both read and writes.
Try using tools like fio to run IO test with directIO(bypass system cache)
--
Deepak
Pretty much says it all. 1GB test file copy to local:
$ time cp /mnt/ceph-kernel-driver-test/test.img .
real
2m50.063s
user
0m0.000s
sys
0m9.000s
$ time cp /mnt/ceph-fuse-test/test.img .
real
0m3.648s
user
0m0.000s
sys
0m1.872s
Yikes. The kernel driver averages ~5MB and the fuse driver averages ~150MBish? Something crazy is happening here. It's not caching, I ran both tests fresh.
Ubuntu 16.04.2, 4.4.0-72-generic, ceph-fuse 10.2.6-1xenial, ceph-fs-common 10.2.6-0ubuntu0.16.04.1 (I also tried the 16.04.2 one, same issue).
Anyone run into this? Did a lot of digging on the ML and didn't see anything. I'm was going to use FUSE for production, but it tends to lag more on a lot of small requests so I had to fall back the kernel driver.
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