From owner-freebsd-net  Fri Oct 18  1:18:27 2002
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From: "Petri Helenius" <pete@he.iki.fi>
To: "Jim McGrath" <jimmcgra@bellatlantic.net>,
	"Luigi Rizzo" <rizzo@icir.org>
Cc: "Lars Eggert" <larse@ISI.EDU>, <freebsd-net@FreeBSD.ORG>
References: <NDBBKKEELKBCJJBEGDECCEHHCGAA.jimmcgra@bellatlantic.net>
Subject: Re: ENOBUFS
Date: Fri, 18 Oct 2002 11:18:45 +0300
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Where could I get the errata sheet?

Could the numbers be packet thresholds? 28 and 128 packets respectively?

Anything else that can be done? Does PCI width/speed affect the amount of
time spent in the kernel interrupt or are the PCI transfers asynchronous?

Pete

----- Original Message -----
From: "Jim McGrath" <jimmcgra@bellatlantic.net>
To: "Luigi Rizzo" <rizzo@icir.org>; "Petri Helenius" <pete@he.iki.fi>
Cc: "Lars Eggert" <larse@ISI.EDU>; <freebsd-net@FreeBSD.ORG>
Sent: Friday, October 18, 2002 7:49 AM
Subject: RE: ENOBUFS


> Careful here.  Read the errata sheet!!  I do not believe the em driver uses
> these parameters, and possibly for a good reason.
>
> Jim
>
> > -----Original Message-----
> > From: owner-freebsd-net@FreeBSD.ORG
> > [mailto:owner-freebsd-net@FreeBSD.ORG]On Behalf Of Luigi Rizzo
> > Sent: Thursday, October 17, 2002 11:12 PM
> > To: Petri Helenius
> > Cc: Lars Eggert; freebsd-net@FreeBSD.ORG
> > Subject: Re: ENOBUFS
> >
> >
> > On Thu, Oct 17, 2002 at 11:55:24PM +0300, Petri Helenius wrote:
> > ...
> > > I seem to get about 5-6 packets on an interrupt. Is this tunable? At
> >
> > just reading the source code, yes, it appears that the card has
> > support for delayed rx/tx interrupts -- see RIDV and TIDV definitions
> > and usage in sys/dev/em/* . I don't know in what units are the values
> > (28 and 128, respectively), but it does appear that tx interrupts are
> > delayed a bit more than rx interrupts.
> >
> > They are not user-configurable at the moment though, you need to rebuild
> > the kernel.
> >
> > cheers
> > luigi
> >
> > > 50kpps the card generates 10k interrupts a second. Sending generates
> > > way less. This is about 300Mbps so with the average packet size of
> > > 750 there should be room for more packets on the interface queue
> > > before needing to service an interrupt?
> > >
> > > What´s the way to access kernel adapter-structure? Is there an utility
> > > that can view the values there?
> > > >
> > > Pete
> > >
> > >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-net" in the body of the message
> >
>
>



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