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Re: [E1000-devel] Transmission limit

To: Robert Olsson <Robert.Olsson@xxxxxxxxxxx>
Subject: Re: [E1000-devel] Transmission limit
From: Scott Feldman <sfeldma@xxxxxxxxx>
Date: Thu, 02 Dec 2004 21:23:30 -0800
Cc: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>, jamal <hadi@xxxxxxxxxx>, P@xxxxxxxxxxxxxx, mellia@xxxxxxxxxxxxxxxxxxxx, e1000-devel@xxxxxxxxxxxxxxxxxxxxx, Jorge Manuel Finochietto <jorge.finochietto@xxxxxxxxx>, Giulio Galante <galante@xxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <16815.23964.93437.411404@robur.slu.se>
References: <1101467291.24742.70.camel@mellia.lipar.polito.it> <41A73826.3000109@draigBrady.com> <16807.20052.569125.686158@robur.slu.se> <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> <16813.58484.343629.570703@robur.slu.se> <1101919791.5198.15.camel@localhost.localdomain> <16815.23964.93437.411404@robur.slu.se>
Reply-to: sfeldma@xxxxxxxxx
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On Thu, 2004-12-02 at 10:23, Robert Olsson wrote: 
> It can increase TX performance from 800 kpps to
>   1125128pps 576Mb/sec (576065536bps) errors: 0
>   1124946pps 575Mb/sec (575972352bps) errors: 0

These are the best numbers reported so far, right?

> And some of Scotts may still be used. 

Did you try combining the two?

> +
> +     if( adapter->tx_ring.next_to_use - adapter->tx_ring.next_to_clean > 80 )
> +             e1000_clean_tx_ring(adapter);
> +

You want to use E1000_DESC_UNUSED here because of the ring wrap. ;-)

-scott


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