Infdrop event message

[Luisa Caeiro]

So, what I understand is that the driver sends periodically information
frames to the host system and because the host system can't process quickly
all the information it drops some. Is that true?
The firmware STA I'm using is version 1.4.9. Do you think than I could
moving to use 32-bit tallies instead of the default 16-bit ones?

Thanks a lot

LC


----- Original Message -----
From: "Jouni Malinen" <jkmaline at cc.hut.fi>
To: <hostap at shmoo.com>
Sent: Tuesday, July 29, 2003 4:05 AM
Subject: Re: Infdrop event message


> On Mon, Jul 28, 2003 at 06:51:03PM +0100, caeiro wrote:
>
> > I'm doing some tests using iperf and I detect that when I use small
packet lenghts (about 160 bytes) for transmission rates about 400K I receive
on dmesg some INFDROP event messages. Some one can help me to understand
what does it mean.
>
> INFDROP is informing the driver about dropped information frame. In this
> case, I would assume this would be a dropped CommTallies (TX/RX
> statistics) information. These errors are usually generated when the
> host system is not processing incoming information frames quickly enough
> and Prism2 card runs out of buffer space. However, I have also seen
> cases in which the firmware seems to have confused something and is
> generating one InfDrop per packet..
>
> Which station firmware version are you using? InfDrop behavior seems to
> vary a bit based on the used firmware version. Some issues could
> possibly be solved by moving to use 32-bit tallies instead of the
> default 16-bit ones, but this does not work on all old STA firmware
> versions. I'm not that worried about couple of InfDrop events, but flood
> of those (like one per TX packet) should be worked around somehow.
> Inquiring the firmware for a CommTally seems to fix some cases and if I
> remember correctly, I added some kind of workaround for some of the
> issues (but not all).
>
> --
> Jouni Malinen                                            PGP id EFC895FA
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