Date: Thu, 13 May 1999 06:34:30 -0700 From: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> To: "Sergey Ayukov (mailing lists)" <asv1@crydee.sai.msu.ru> Cc: Doug Rabson <dfr@nlsystems.com>, Mats Lofkvist <mal@algonet.se>, stable@FreeBSD.ORG, bde@FreeBSD.ORG Subject: Re: NFS question.. Message-ID: <199905131334.GAA32197@cwsys.cwsent.com> In-Reply-To: Your message of "Mon, 10 May 1999 21:01:11 %2B0400." <Pine.BSF.4.05.9905102008190.5298-100000@crydee.sai.msu.ru>
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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.
Regards, Phone: (250)387-8437
Cy Schubert Fax: (250)387-5766
Open Systems Group Internet: Cy.Schubert@uumail.gov.bc.ca
ITSD Cy.Schubert@gems8.gov.bc.ca
Province of BC
"e**(i*pi)+1=0"
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