Date: Sun, 3 Jan 2016 07:16:04 +0000 From: =?utf-8?B?S2FybGkgU2rDtmJlcmc=?= <karli.sjoberg@slu.se> To: Mikhail T. <mi+thun@aldan.algebra.com> Cc: "freebsd-fs@FreeBSD.org" <freebsd-fs@FreeBSD.org> Subject: Re: NFS reads vs. writes Message-ID: <8291bb85-bd01-4c8c-80f7-2adcf9947366@email.android.com>
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Den 3 jan. 2016 4:01 fm skrev "Mikhail T." <mi+thun@aldan.algebra.com>: > > I have two similar 10.2-STABLE machines mounting each other's > filesystems via NFS: a:/a and b:/b > > When moving some large files around today, I found a huge discrepancy > between writing and reading over NFS. That is, machine a copying files > from its own /a to NFS-mounted b:/b was pushing measly 2-3Mb/s over the > Ethernet. When I cancelled that, logged-in to machine b and proceed to > copy from a:/a to the now-local /b, I got 56Mb/s. I tried changing the > wsize and rsize options, but it did not seem to make a difference... > > Any ideas, what is happening here? Why are NFS-writes some 25 times > slower here, than reads? Both filesystems are zfs-backed (though with > different options), both systems are plugged into the same switch, both > use mtu of 9000. The difference between "mount" and "mount -o async" should tell you if you'd benefit from a separate log device in the pool. /K > > Thanks! Yours, > > -mi > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"help
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