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Re: 1.03Mpps on e1000 (was: Re: [E1000-devel] Transmission limit)

To: Martin Josefsson <gandalf@xxxxxxxxxxxxxx>
Subject: Re: 1.03Mpps on e1000 (was: Re: [E1000-devel] Transmission limit)
From: jamal <hadi@xxxxxxxxxx>
Date: 06 Dec 2004 06:32:37 -0500
Cc: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>, Scott Feldman <sfeldma@xxxxxxxxx>, 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: <Pine.LNX.4.58.0412051852340.29474@xxxxxxxxxxxxxx>
Organization: jamalopolous
References: <1101824754.1044.126.camel@xxxxxxxxxxxxxxxx> <20041201001107.GE4203@xxxxxxxxxxxxxxxxx> <1101863399.4663.54.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20041201182943.GA14470@xxxxxxxxxxxxxxxxx> <20041201213550.GF14470@xxxxxxxxxxxxxxxxx> <1101967983.4782.9.camel@xxxxxxxxxxxxxxxxxxxxx> <20041205145051.GA647@xxxxxxxxxxxxxxxxx> <Pine.LNX.4.58.0412051559350.29474@xxxxxxxxxxxxxx> <Pine.LNX.4.58.0412051638290.29474@xxxxxxxxxxxxxx> <20041205174401.GJ647@xxxxxxxxxxxxxxxxx> <20041205175133.GK647@xxxxxxxxxxxxxxxxx> <Pine.LNX.4.58.0412051852340.29474@xxxxxxxxxxxxxx>
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On Sun, 2004-12-05 at 12:54, Martin Josefsson wrote:
> On Sun, 5 Dec 2004, Lennert Buytenhek wrote:
> 
> > I've tested all packet sizes now, and delayed TDT updating once per jiffy
> > (instead of once per packet) indeed gives about 25kpps more on 60,61,62
> > byte packets, and is hardly worth it for bigger packets.
> 
> Maybe we can't see any real gains here now, I wonder if it has any effect
> if you have lots of nics on the same bus. I mean, in theory it saves a
> whole lot of traffic on the bus.
> 

This sounds like really exciting stuff happening here over the weekend.
Scott, you had to leave Intel before giving us this tip? ;-> 

Someone correct me if i am wrong - but does it appear as if all these
changes are only useful on PCI but not PCI-X?

cheers,
jamal


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