Hi Anna- > On Feb 14, 2020, at 4:12 PM, schumaker.anna@xxxxxxxxx wrote: > > From: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx> > > These patches add client support for the READ_PLUS operation, which > breaks read requests into several "data" and "hole" segments when > replying to the client. I also add a "noreadplus" mount option to allow > users to disable the new operation if it becomes a problem, similar to > the "nordirplus" mount option that we already have. Hrm, I went looking for the patch that adds "noreadplus", but I don't see it in this series? Wondering if, to start off, the default should be "noreadplus" until our feet are under us. Just a thought. > Here are the results of some performance tests I ran on Netapp lab > machines. I tested by reading various 2G files from a few different > undelying filesystems and across several NFS versions. I used the > `vmtouch` utility to make sure files were only cached when we wanted > them to be. In addition to 100% data and 100% hole cases, I also tested > with files that alternate between data and hole segments. These files > have either 4K, 8K, 16K, or 32K segment sizes and start with either data > or hole segments. So the file mixed-4d has a 4K segment size beginning > with a data segment, but mixed-32h hase 32K segments beginning with a > hole. The units are in seconds, with the first number for each NFS > version being the uncached read time and the second number is for when > the file is cached on the server. > > ext4 | v3 | v4.0 | v4.1 | v4.2 | > ----------|-----------------|-----------------|-----------------|-----------------| > data | 22.909 : 18.253 | 22.934 : 18.252 | 22.902 : 18.253 | 23.485 : 18.253 | > hole | 18.256 : 18.253 | 18.255 : 18.252 | 18.256 : 18.253 | 0.708 : 0.709 | > mixed-4d | 28.261 : 18.253 | 29.616 : 18.252 | 28.341 : 18.252 | 24.508 : 9.150 | > mixed-8d | 27.956 : 18.253 | 28.404 : 18.252 | 28.320 : 18.252 | 23.967 : 9.140 | > mixed-16d | 28.172 : 18.253 | 27.946 : 18.252 | 27.627 : 18.252 | 23.043 : 9.134 | > mixed-32d | 25.350 : 18.253 | 24.406 : 18.252 | 24.384 : 18.253 | 20.698 : 9.132 | > mixed-4h | 28.913 : 18.253 | 28.564 : 18.252 | 27.996 : 18.252 | 21.837 : 9.150 | > mixed-8h | 28.625 : 18.253 | 27.833 : 18.252 | 27.798 : 18.253 | 21.710 : 9.140 | > mixed-16h | 27.975 : 18.253 | 27.662 : 18.252 | 27.795 : 18.253 | 20.585 : 9.134 | > mixed-32h | 25.958 : 18.253 | 25.491 : 18.252 | 24.856 : 18.252 | 21.018 : 9.132 | > > xfs | v3 | v4.0 | v4.1 | v4.2 | > ----------|-----------------|-----------------|-----------------|-----------------| > data | 22.041 : 18.253 | 22.618 : 18.252 | 23.067 : 18.253 | 23.496 : 18.253 | > hole | 18.256 : 18.253 | 18.255 : 18.252 | 18.256 : 18.253 | 0.723 : 0.708 | > mixed-4d | 29.417 : 18.253 | 28.503 : 18.252 | 28.671 : 18.253 | 24.957 : 9.150 | > mixed-8d | 29.080 : 18.253 | 29.401 : 18.252 | 29.251 : 18.252 | 24.625 : 9.140 | > mixed-16d | 27.638 : 18.253 | 28.606 : 18.252 | 27.871 : 18.253 | 25.511 : 9.135 | > mixed-32d | 24.967 : 18.253 | 25.239 : 18.252 | 25.434 : 18.252 | 21.728 : 9.132 | > mixed-4h | 34.816 : 18.253 | 36.243 : 18.252 | 35.837 : 18.252 | 32.332 : 9.150 | > mixed-8h | 43.469 : 18.253 | 44.009 : 18.252 | 43.810 : 18.253 | 37.962 : 9.140 | > mixed-16h | 29.280 : 18.253 | 28.563 : 18.252 | 28.241 : 18.252 | 22.116 : 9.134 | > mixed-32h | 29.428 : 18.253 | 29.378 : 18.252 | 28.808 : 18.253 | 27.378 : 9.134 | > > btrfs | v3 | v4.0 | v4.1 | v4.2 | > ----------|-----------------|-----------------|-----------------|-----------------| > data | 25.547 : 18.253 | 25.053 : 18.252 | 24.209 : 18.253 | 32.121 : 18.253 | > hole | 18.256 : 18.253 | 18.255 : 18.252 | 18.256 : 18.252 | 0.702 : 0.724 | > mixed-4d | 19.016 : 18.253 | 18.822 : 18.252 | 18.955 : 18.253 | 18.697 : 9.150 | > mixed-8d | 19.186 : 18.253 | 19.444 : 18.252 | 18.841 : 18.253 | 18.452 : 9.140 | > mixed-16d | 18.480 : 18.253 | 19.010 : 18.252 | 19.167 : 18.252 | 16.000 : 9.134 | > mixed-32d | 18.635 : 18.253 | 18.565 : 18.252 | 18.550 : 18.252 | 15.930 : 9.132 | > mixed-4h | 19.079 : 18.253 | 18.990 : 18.252 | 19.157 : 18.253 | 27.834 : 9.150 | > mixed-8h | 18.613 : 18.253 | 19.234 : 18.252 | 18.616 : 18.253 | 20.177 : 9.140 | > mixed-16h | 18.590 : 18.253 | 19.221 : 18.252 | 19.654 : 18.253 | 17.273 : 9.135 | > mixed-32h | 18.768 : 18.253 | 19.122 : 18.252 | 18.535 : 18.252 | 15.791 : 9.132 | > > ext3 | v3 | v4.0 | v4.1 | v4.2 | > ----------|-----------------|-----------------|-----------------|-----------------| > data | 34.292 : 18.253 | 33.810 : 18.252 | 33.450 : 18.253 | 33.390 : 18.254 | > hole | 18.256 : 18.253 | 18.255 : 18.252 | 18.256 : 18.253 | 0.718 : 0.728 | > mixed-4d | 46.818 : 18.253 | 47.140 : 18.252 | 48.385 : 18.253 | 42.887 : 9.150 | > mixed-8d | 58.554 : 18.253 | 59.277 : 18.252 | 59.673 : 18.253 | 56.760 : 9.140 | > mixed-16d | 44.631 : 18.253 | 44.291 : 18.252 | 44.729 : 18.253 | 40.237 : 9.135 | > mixed-32d | 39.110 : 18.253 | 38.735 : 18.252 | 38.902 : 18.252 | 35.270 : 9.132 | > mixed-4h | 56.396 : 18.253 | 56.387 : 18.252 | 56.573 : 18.253 | 67.661 : 9.150 | > mixed-8h | 58.483 : 18.253 | 58.484 : 18.252 | 59.099 : 18.253 | 77.958 : 9.140 | > mixed-16h | 42.511 : 18.253 | 42.338 : 18.252 | 42.356 : 18.252 | 51.805 : 9.135 | > mixed-32h | 38.419 : 18.253 | 38.504 : 18.252 | 38.643 : 18.252 | 40.411 : 9.132 | > > > Changes since v1: > - Rebase to 5.6-rc1 > - Drop the mount option patch for now > - Fix fallback to READ when the server doesn't support READ_PLUS > > Any questions? > Anna > > > Anna Schumaker (6): > SUNRPC: Split out a function for setting current page > SUNRPC: Add the ability to expand holes in data pages > SUNRPC: Add the ability to shift data to a specific offset > NFS: Add READ_PLUS data segment support > NFS: Add READ_PLUS hole segment decoding > NFS: Decode multiple READ_PLUS segments > > fs/nfs/nfs42xdr.c | 169 +++++++++++++++++++++++++ > fs/nfs/nfs4proc.c | 43 ++++++- > fs/nfs/nfs4xdr.c | 1 + > include/linux/nfs4.h | 2 +- > include/linux/nfs_fs_sb.h | 1 + > include/linux/nfs_xdr.h | 2 +- > include/linux/sunrpc/xdr.h | 2 + > net/sunrpc/xdr.c | 244 ++++++++++++++++++++++++++++++++++++- > 8 files changed, 457 insertions(+), 7 deletions(-) > > -- > 2.25.0 > -- Chuck Lever chucklever@xxxxxxxxx
