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Re: [E1000-devel] Transmission limit

To: sfeldma@xxxxxxxxx
Subject: Re: [E1000-devel] Transmission limit
From: jamal <hadi@xxxxxxxxxx>
Date: 03 Dec 2004 08:24:49 -0500
Cc: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>, Robert Olsson <Robert.Olsson@xxxxxxxxxxx>, P@xxxxxxxxxxxxxx, mellia@xxxxxxxxxxxxxxxxxxxx, e1000-devel@xxxxxxxxxxxxxxxxxxxxx, Jorge Manuel Finochietto <jorge.finochietto@xxxxxxxxx>, Giulio Galante <galante@xxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <1101967983.4782.9.camel@localhost.localdomain>
Organization: jamalopolous
References: <1101484740.24742.213.camel@mellia.lipar.polito.it> <41A76085.7000105@draigBrady.com> <1101499285.1079.45.camel@jzny.localdomain> <16811.8052.678955.795327@robur.slu.se> <1101821501.1043.43.camel@jzny.localdomain> <20041130134600.GA31515@xi.wantstofly.org> <1101824754.1044.126.camel@jzny.localdomain> <20041201001107.GE4203@xi.wantstofly.org> <1101863399.4663.54.camel@sfeldma-mobl.dsl-verizon.net> <20041201182943.GA14470@xi.wantstofly.org> <20041201213550.GF14470@xi.wantstofly.org> <1101967983.4782.9.camel@localhost.localdomain>
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On Thu, 2004-12-02 at 01:13, Scott Feldman wrote:
> On Wed, 2004-12-01 at 13:35, Lennert Buytenhek wrote: 
> > Pretty graph attached.  From ~220B packets or so it does wire speed, but
> > there's still an odd drop in performance around 256B packets (which is
> > also there without your patch.)  From 350B packets or so, performance is
> > identical with or without your patch (wire speed.)
>
> Seems this is helping PCI nics but not PCI-X.  I was using PCI 32/33. 
> Can't explain the dip around 256B.
> 

Interesting thought. I also saw improvements with my batching patch for
PCI 32/32 but nothing noticeable in PCI-X 64/66.

cheers,
jamal


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