Date: Thu, 13 May 1999 23:17:40 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> Cc: "Sergey Ayukov (mailing lists)" <asv1@crydee.sai.msu.ru>, Mats Lofkvist <mal@algonet.se>, stable@freebsd.org, bde@freebsd.org Subject: Re: NFS question.. Message-ID: <Pine.BSF.4.05.9905132316380.509-100000@herring.nlsystems.com> In-Reply-To: <199905131334.GAA32197@cwsys.cwsent.com>
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On Thu, 13 May 1999, Cy Schubert - ITSD Open Systems Group wrote: > In message <Pine.BSF.4.05.9905102008190.5298-100000@crydee.sai.msu.ru>, > "Sergey > Ayukov (mailing lists)" writes: > > > > NFSD Host OS Network Throughput, KB/s Comments > > speed Read Write > > FreeBSD 3.1 100 4500 610 ! vfs.nfs.async=1 > > FreeBSD 3.1 100 550 vfs.nfs.async=0 > > FTP->FreeBSD 100 6000 3000 > > FreeBSD 3.1 10 1040 560 vfs.nfs.async=1 > > FreeBSD 3.1 10 330 vfs.nfs.async=0 > > Linux 10 1020 800 ! > > Solaris 7 (i386) 10 900 480 > > I don't think that this is an NFS issue. You'll generally find that > write local filesystem performance of FreeBSD is slower on FreeBSD than > on Linux. Linux filesystems are written asynchronously while FreeBSD > by default writes metadata synchronously (SMD). SMD (Synchronous > Metadata) writes are not the same as synchronous writes (all writes to > the filesystem being synchronous) -- sync option on the mount command. > IIRC, Bruce Evans made the comment last year that by mounting a > filesystem async, he had an incredible performance improvement. I'm > sorry I cannot recall the actual percentage of performance improvement. I have found that softupdates works at least as well as async (possibly better) and keeps me feeling 'safe' about my filesystems. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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