I tried Fedora 25 (kernel 4.10.8-200.fc25.x86_64) with the kernel driver and it works great. Perhaps you're on to something with the kernel version. I didn't realize how far behind 16.04 was on this.
I will give upgrading Ubuntu 16.04 to a newer kernel the old college try. Thanks. On Sun, Apr 9, 2017 at 11:41 AM, Kyle Drake <k...@kyledrake.net> wrote: > On Sun, Apr 9, 2017 at 9:31 AM, John Spray <jsp...@redhat.com> wrote: > >> On Sun, Apr 9, 2017 at 12:48 AM, Kyle Drake <k...@kyledrake.net> wrote: >> > 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. >> >> What does "fresh" mean in this context? i.e. what did you do in >> between runs to reset it? Have you tried running your procedure in >> the reverse order (i.e. is the kernel client still slow when you're >> running it after the fuse client)? >> > > I rebooted the machine and ran the same test. > > I just repeated the exercise by creating two completely different test > files, one for each driver, and got the same results. > > The FUSE driver has never under any circumstances been as slow, though > when I feed a lot of activity into it at once, it tends to get stuck on > something and hang for a while, so it's not a solution for me unfortunately. > > >> >> > 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). >> >> I don't know of any issues in the older kernel that you're running, >> but you should be aware that 4.4 is over a year old and as far as I >> know there is no backporting of cephfs stuff to the Ubuntu kernel, so >> you're not getting the latest fixes. >> > > That could be related, but Ubuntu 16.04 is going to be around for a long > time, so this is probably something that needs to get addressed (unless I'm > literally the only person on the planet experiencing this bug, as it seems > to be right now). I don't know how to get on a newer kernel than that > (without potentially wrecking the distro). > > I was actually about to try 14.04 to see if it does the same thing. If it > works I'll post an update. > > -Kyle >
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