Date: Mon, 11 Dec 2000 18:26:22 +0100 From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: Guolin Cheng <Guolin@alexa.com> Cc: "'freebsd-questions@FreeBSD.ORG'" <freebsd-questions@FreeBSD.ORG> Subject: Re: How to improve FreeBSD nfs performance? and please explain the k ernel parameters. Message-ID: <20001211182622.A49121@curry.mchp.siemens.de> In-Reply-To: <2A2825AC1334D411A922005004E0CD203F2BEB@exchange.alexa.com>; from Guolin@alexa.com on Thu, Dec 07, 2000 at 08:37:50PM -0800 References: <2A2825AC1334D411A922005004E0CD203F2BEB@exchange.alexa.com>
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On Thu, 07-Dec-2000 at 20:37:50 -0800, Guolin Cheng wrote:
> Hi, all,
>
> These days I encountered a nfs performance problem, Basically we use Intel
> machines with 512M memory, Intel Pro100M Ethernet network interfaces and HP
> switches,
> But we find that the performance is too bad:
>
> This is the performance test,. write from nfs client to nfs server mounted
> through amd ("nfsiod -n 4" and "nfsd -t -u -n 16" are running to improve
> performance already):
>
> nfs server: nfs client: transfer speed (Mega bytes)
>
> FreeBSD 4.1 FreeBSD 4.1 2-4 M
> FreeBSD 4.1 RedHat Linux 6.2 5-7 M
> Linux 6.2 Linux 6.2 10+ M
>
> So it's really terrible, because I like FreeBSD and we install a lot of
> FreeBSD boxes. So I tried to change nfs sync-write method, which is default
> for FreeBSD, try to use async method, (sysctl -w vfs.nfs.async=1 ; sysctl
> -w vfs.nfs.gatherdelay=0 ) and test the performance again, and the
> performance is improved a lot
>
> nfs server: nfs client: transfer speed (Mega bytes)
>
> FreeBSD 4.1 FreeBSD 4.1 7-10 M
Well, I can't explain the sysctl parameters but I get
11426035 bytes/sec when reading data from an NFS server
11708689 bytes/sec when writing data to an NFS server
All machines use FreeBSD-4.2
I use Asus P2B boards with 500 - 800 MHz and Intel Etherexpress cards
connected by an Allied Telesyn switch. The only sysctl I changed was
vfs.nfs.async=1. I never had problems and lots of machines have used
this setting for a long time now.
Hth,
-Andre
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