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Date:      Wed, 15 May 2002 11:20:12 +0100
From:      Jamie Heckford <jamie@tridentmicrosystems.co.uk>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        freebsd-stable@freebsd.org, freebsd-hackers@freebsd.org
Subject:   Re: NFS Problems with Quantum Snapserver 4100 (BGE Cards!)
Message-ID:  <20020515112012.A7390@mufuf.trident-uk.co.uk>
In-Reply-To: <200205141853.g4EIrxN8075305@apollo.backplane.com>; from dillon@apollo.backplane.com on Tue, May 14, 2002 at 11:53:59AM -0700
References:  <20020513181756.A53366@mufuf.trident-uk.co.uk> <200205131808.g4DI8JnE069036@apollo.backplane.com> <20020514102221.A55183@mufuf.trident-uk.co.uk> <200205141853.g4EIrxN8075305@apollo.backplane.com>

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Already running the card and switch port in 100BaseTX FDX (forced) :)

Would use GigE if the switch supported it tho....

Thus spake Matthew Dillon (dillon@apollo.backplane.com) :

>     It should also work if you force the GigE card into 100BaseTX mode, 
>     assuming the switch can deal with it.  Though of course then you are 
>     not getting GigE speeds. 
> 
>     Your description is very similar to a problem I had on my 2550's that
>     Bill Paul finally solved.  It turned out that my 2550's (BCM5700) were
>     not initializing the polynomial functions properly and this resulted
>     in packet loss.  Whenever you get bit stuffing packet loss like that,
>     certain bit patterns will *always* fail.  But I'm sure this issue has
>     already been dealt with on the 5701 so the problem you are having is
>     probably different.
> 
>     The result is the appearance of hicups and delays on a TCP connection,
>     and repeatable hangs when just the wrong data pattern is transmitted
>     (because that packet winds up failing every time rather then just some
>     of the time).
> 
>     Another possibility in regards to packet loss is simply a bad cable
>     (if you are running GigE over copper).  GigE is very sensitive to cable
>     issues and a bad crimp will screw things up easily.
> 
>     In anycase, my feeling about GigE in general is that it's a great cheap
>     way to aggregate data on an uplink, or to an NFS server that needs it,
>     but the incremental cost and hassle factor are still too high to
>     extend the benefit to generic servers.
> 
> 						-Matt

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