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Date:      Fri, 13 Sep 2002 18:07:14 -0400
From:      "Moti Levy" <moti@flncs.com>
To:        "Steve Fettig" <lists@stevenfettig.com>, <net@freebsd.org>
Subject:   Re: Network Transfer Speed Issues - Tweaks/Advice?
Message-ID:  <003201c25b71$f03c4930$f901a8c0@win>
References:  <DEC874D3-C763-11D6-9524-00039384AB84@stevenfettig.com>

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i my expirience it's ot the etwork but the file types .....
is it a large amount of small files or a small amount of large files .
i get over 400kb a sec when transfering large ( 1gb + ) files files but
7.2kb a sec when copying our small files ( 1 to 5 kb each but over 300,000
of them )
if it's the case with you AFAIK there's not much you can do but change IO
devices .
Moti

----- Original Message -----
From: "Steve Fettig" <lists@stevenfettig.com>
To: <net@freebsd.org>
Sent: Friday, September 13, 2002 5:58 PM
Subject: Network Transfer Speed Issues - Tweaks/Advice?


> Hi,
>
> I already asked this one in questions thinking that I should try there
> before hitting the net list.  Since I haven't received any responses, I
> was hoping someone here might have a clue.
> I recently set up an NFS server to run daily backups on.  The server was
> built using an old P150 w/ 90 MB of ram and a 6GB hard drive.  (All
> servers in this experiment are set up using FBSD 4.6.2 and the client is
> a Mac PowerBook G4 running Mac OS X.)  Attached to it is an external
> SCSI hard drive enclosure with 4 47GB SCSI drives running off an
> AHA-2490UW SCSI adapter.  I am getting really odd performance when doing
> an NFS transfer (I also get odd performance out of scp) from the machine
> I am trying to back up.  I will get a burst of 20Mbps for about 30
> seconds, then it will ramp down to 1 Mbps for about 2 minutes, ramp
> backup to 20 Mbps, then back down to 1 Mbps and so on.  It take
> absolutely forever to do any high volume transfer at this rate.  I
> originally thought it was a faulty NIC, so I swapped out my 3Com 509B
> Fast Etherlink card for an Intel Pro 10/100 card.  The switch between
> cards and also between PCI slots has made no difference.  When I run the
> same setup on a PIII 1GHz machine, the results are completely
> different.  I get average transfer rates of 20-40 Mbps between the
> client and server using the same ethernet hardware.  I have also set up
> another test on a dual PII-450 and have the same luck as with the PIII 1
> GHz machine.  This is using the same network cables and adapters, but
> between faster machines.
> I don't have any other services other than NFS running on the old P150,
> so I don't understand what would be the root of the problem.
> Is there something I can tweak in the kernel config that would help me
> attain higher, consistent throughput or am I out of luck with the older
> machine?  (By the way, soft updates are enabled on all of the machines.
> MaxUsers is set to 0 on the P150 and to 128 on the PIII 1 GHz, but from
> what I have read in the Handbook, setting MaxUsers to 0 only helps the
> system decide what is best given the current configuration.)  If needed
> I can also attach my current kernel config...
>
> Thanks,
> Steve
>
>
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>


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