Date: Sat, 26 Nov 2016 23:06:26 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Alan Somers <asomers@freebsd.org>, Konstantin Belousov <kostikbel@gmail.com> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: NFSv4 performance degradation with 12.0-CURRENT client Message-ID: <YQBPR01MB01806976D2A8EDB53DEBDA95DD880@YQBPR01MB0180.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <CAOtMX2ikX7a==pKNdLnzihM0Hw2Ok=Rw2PWx8ioW3TVtzAvDzg@mail.gmail.com> References: <CAOtMX2jJ2XoQyVG1c04QL7NTJn1pg38s=XEgecE38ea0QoFAOw@mail.gmail.com> <20161124090811.GO54029@kib.kiev.ua> <YTXPR01MB0189E0B1DB5B16EE6B388B7DDDB60@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> <CAOtMX2hBXAJN_udED-u5%2B6UznR2%2BW88xgb=RqKSZL65Z3%2BcKOw@mail.gmail.com> <YTXPR01MB0189C3E11821E4F7B7DF1814DDB60@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> <20161125084106.GX54029@kib.kiev.ua> <YTXPR01MB018969FB21212700C4043AEADD890@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> <20161125135725.GD54029@kib.kiev.ua>, <CAOtMX2ikX7a==pKNdLnzihM0Hw2Ok=Rw2PWx8ioW3TVtzAvDzg@mail.gmail.com>
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Alan Somers wrote: [stuff snipped] >Mounting nullfs with the nocache option, ad kib suggested, fixed the >problem. Also, applying kib's patch and then mounting nullfs with >default options also fixed the problem. Here is the nfsstat output >for "ls -al" when using kib's patch. Notice the client has far fewer >opens: I did a quick test which confirmed that the opens get closed when the "noca= che" option is used on the nullfs mount as well. Kostik, I think your patch is a good idea and you can consider it reviewed = by me if you'd like. I also did a quick test wth unionfs and it did not accumulate opens, so it = doesn't seem to suffer from this problem. (It does have issues, as noted by the BUG= S section of the mount_unionfs man page.) rick
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