Date: Wed, 6 Feb 2002 20:05:24 +0000 From: Nuno Subtil <nsubtil@vega.dhis.co.it.pt> To: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Whats with this -> sendto: No buffer space available Message-ID: <20020206200524.A14992@vega.dhis.co.it.pt>
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Karl Dietz asked for this to be forwarded to the lists, so here it is.
----- Forwarded message from Karl Dietz <Karl.Dietz@TRIPLAN.com> -----
From: "Karl Dietz" <Karl.Dietz@TRIPLAN.com>
Date: Wed, 6 Feb 2002 19:02:51 +0100
To: "Jonathan Hanna" <jhanna@shaw.ca>, <nsubtil@vega.dhis.co.it.pt>
Subject: Re: Whats with this -> sendto: No buffer space available
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Meanwhile I have browsed through the code of ep and vx.
> 3) in ep_intr:
>
> rescan:
>
> while ((status = inw(BASE + EP_STATUS)) & S_5_INTS) {
>
> /* first acknowledge all interrupt sources */
> outw(BASE + EP_COMMAND, ACK_INTR | (status & S_MASK));
>
> if (status & (S_RX_COMPLETE | S_RX_EARLY)) {
> old_status = status;
> epread(sc);
> continue;
> }
>
> It seems that if an RX is done then any TX conditions are lost as an ack
of all
> sources has been done. I have verified that on the next look after the
epread
> TX conditions have disappeared without being handled. If OACTIVE is set,
the vx driver (which is to be folded back into ep) has a more verbose
comment on the code in question:
/*
* Acknowledge any interrupts. It's important that we do this
* first, since there would otherwise be a race condition.
* Due to the i386 interrupt queueing, we may get spurious
* interrupts occasionally.
*/
But the handler is written in a way that tx interupts get lost only if
a card failure occurs.
Anyway the modified driver has transfered more than 4 million packets
already without a problem (two interfaces, some flood pings, and the
whole internet traffic)
Regards,
Karl
PS: Can one of you forward this to the list?
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