On Mon, Jun 26, 2017 at 09:09:49PM +0000, Brian Cowan wrote: > The "feature implemented only in linux" statement worries me... Does > this mean that only Linux's NFS client server implements this NFSv4.1 > "lock freed" behavior? Actually, I shouldn't have said that. The linux (client and server) implementation is the one I know of, but there may well be others. It's an optional feature of NFSv4.1: https://tools.ietf.org/html/rfc5661#section-20.11 If you notice 1-second-ish delays acquiring contended locks against other servers then it may be worth filing bugs with them and suggesting they support CB_NOTIFY_LOCK. It shouldn't be especially difficult. --b. > > -----Original Message----- > From: J. Bruce Fields [mailto:bfields@xxxxxxxxxxxx] > Sent: Monday, June 26, 2017 1:38 PM > To: Brian Cowan <brian.cowan@xxxxxxx> > Cc: linux-nfs@xxxxxxxxxxxxxxx > Subject: Re: 2 potentially stupid questions. > > On Sat, Jun 24, 2017 at 12:42:22AM +0000, Brian Cowan wrote: > > Well, I'm trying to avoid having to test against 2 filers (Netapp and > > emc), at least 2 versions of each of 3 linux distributions (Red Hat > > 6.x and 7.x, SuSE 11 and 12, ubuntu 12, 14, and 16) and Solaris 11 > > (Sparc and x86) as servers, against each of those Unix OS's as > > clients. Right about now I'm happy I don't need to test using WINDOWS > > NFS client/server products, because so few of those work consistently > > even inside the same major version.a complete test could trference as > > many as 99 client/server combinations. Given that a single test run > > takes just over an hour and a half for data collection... And my first > > attempt at data analysis took longer (need to write a script to > > process the log files into a summary instead of importing 20 400,000 > > line TSV files into excel). > > > > My hope was that we someone could say that "x" was the server > > "reference" implementation. IOW, if the server didn't act like "x" > > (which used to be "Solaris" back in the day) it was arguable that the > > server was defective. > > I don't think there's such a shortcut, sorry. > > In the Linux case, if possible, testing on upstream code (on Fedora or a similar relatively fast-to-update distro) is always helpful, as it helps catch problems early. > > > As it stands, I saw some odd behavior in the RH 7.4 beta that I may > > need to reproduce in 4.9... Apparently something is allergic to odd > > numbers in redhat's version of the NFSv4.1 client/server. I get odd > > peaks in the maximum lockf call time when there is an odd number of > > lockers. We're talking maximum times >10,000x the mean lock time. > > I was about to say we have a bug opened for that and realized you're probably the reporter--sorry, I didn't make the connection. Yes, we're looking into that. It uses a feature that I believe is so far only implemented in Linux, which would explain why you'd need recent client and server to hit it, and it's probably reproduceable with upstream too. > > --b. > > > ::DISCLAIMER:: > ---------------------------------------------------------------------------------------------------------------------------------------------------- > > The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. > E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, > lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents > (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. > Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the > views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, > distribution and / or publication of this message without the prior written consent of authorized representative of > HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. > Before opening any email and/or attachments, please check them for viruses and other defects. > > ---------------------------------------------------------------------------------------------------------------------------------------------------- -- 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
