On 10/04/13 17:18, Peter Staubach wrote: > Miquel van Smoorenburg wrote: >> >> These NFS client patches are posted as an RFC - request for comment. >> >> The idea behind these patches is to make it possible to cut down on >> the number of NFS operations used when opening a file in certain >> circumstances and environments (esp. mostly-readonly environments). > > Outside of possibly reducing the overall RPC count between the NFS > client and the NFS server, was a difference measured in the overall > performance of the website, from the customer's viewpoint? (Sorry, it took a while before I could run these tests) Yes- mostly tests with a webbrowser, as in "does it 'feel' faster", which is hard to quantify objectively. We also ran some more objective tests, which I re-ran just now. I took one of our servers out of the cluster, and did some tests on it. I ran a "wget http://customer-site.nl/"; on it repeatedly with different mount options. The customer testsite is a joomla site (one of the 'modular' CMSes that stats/opens a lot of files for each page-request). 2 sessions below, each session was started with an empty cache. 1. Mountoptions: rw,nosuid,tcp,noatime,vers=3 request request time (wget) 1 0m1.287s 2 0m0.550s 3 0m0.453s 4 0m0.343s 5 0m0.379s nfsstat: Client rpc stats: calls retrans authrefrsh 2612 0 2612 Client nfs v3: null getattr setattr lookup access readlink 0 0% 1308 50% 0 0% 416 15% 667 25% 3 0% read write create mkdir symlink mknod 216 8% 0 0% 0 0% 0 0% 0 0% 0 0% remove rmdir rename link readdir readdirplus 0 0% 0 0% 0 0% 0 0% 0 0% 2 0% fsstat fsinfo pathconf commit 0 0% 0 0% 0 0% 0 0% 2. Mountoptions: rw,nosuid,tcp,noatime,noaccesscheck,sloppycto=3,vers=3 request request time (wget) 1 0m0.787s 2 0m0.376s 3 0m0.385s 4 0m0.324s 5 0m0.338s nfsstat: Client rpc stats: calls retrans authrefrsh 1539 0 1539 Client nfs v3: null getattr setattr lookup access readlink 0 0% 902 58% 0 0% 416 27% 0 0% 3 0% read write create mkdir symlink mknod 216 14% 0 0% 0 0% 0 0% 0 0% 0 0% remove rmdir rename link readdir readdirplus 0 0% 0 0% 0 0% 0 0% 0 0% 2 0% fsstat fsinfo pathconf commit 0 0% 0 0% 0 0% 0 0% You can clearly see that with the new mount options the number of NFS requests is way lower, and page loading time (esp. for the first request) has gone down. The number of lookups and reads is exactly the same, but the second nfsstat has zero 'access' calls and 45% less 'getattr' calls. Mike. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
