From: Dexter Filmore <Dexter.Filmore@gmx.de>
Subject: Re: Poor NFS performance, kernel 2.6.6.
Date: Thu, 27 May 2004 14:39:19 +0200
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20040527143919.4bdda5d7@shodan.citadel>
References: <Pine.LNX.4.58.0405271331430.7539@penti.sit.fi>
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To: nfs@lists.sourceforge.net
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How are the GB NICs attached? Onboard? Integrated into Southbridge? PCI?
PCI-X? 
If it's plain old PCI, you won't get more, PCI maxes out here. 


On Thu, 27 May 2004 13:31:57 +0300 (EEST)
Harald Hannelius <harald+nfs@arcada.fi> wrote:

> 
> Hi there,
> 
> I'm running two servers, both Dual Opterons with Broadcom Gb NICs. I'm
> using the bcm5700 driver and I see no errors whatsoever with 'ifconfig'.
> 
> I'm using nfs-utils-1.0.6 and the 2.6.6 kernel, compiled with both NFSv3
> and NFSv4 support. The client and servers are identical except for the
> server having a scsi-raid under /home and the client being and IDE-box.
> 
> Distribution slackware-9.1 on both computers.
> 
> /etc/exports;
> 
>    /home   193.167.32.175(ro,no_root_squash,async)
> 
> /etc/fstab;
> 
>   193.167.32.187:/home    /home   nfs     \
>  defaults,noauto,rsize=32768,wsize=32768,nfsvers=3 0 0
> 
> (as you can see I have experimented with different rsize,wsize without any
> noticeable effect, same goes for nfsvers 2 and 3. I even mounted the
> filesystem as ext2 on the server and as ext3 with data=journal with no
> effect)
> 
> The computers are connected through a HP 8-port Gb switch and are on the
> same subnet.
> 
> rsync over ssh gives me roughly 200Mbps (37 GB dataset)
> netcat over tcp with a 2GB file gives me 457 Mbps
> netcat over udp with a 2GB file gives me 640 Mbps
> 
> But dd'ing the 2GB file over nfs as some NFS-HOWTO suggests takes over 5
> minutes. That should equal to something around 49 Mbps, correct?
> 
> The netcat takes 25 secs to transfer 2GB file.
> 
> Is there some way I can look at the nfs-server what it's doing? Any
> suggestions on solutions for this?
> 
> And what datarates over NFS could I expect on a setup like this?
> Half-wirespeed maybe?
> 
> Thanks in advance,
> 
>   Harald
> 
> 
> -- 
> A: Top Posters
> Q: What is the most annoying thing on mailing lists?
> 
> Harald H Hannelius | harald/a\arcada.fi      | GSM +358 50 594 1020
> 
> 
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