netdev - Re: UDP multicast packet loss not reported if TX ring overrun?

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Date:	Tue, 25 Aug 2009 09:45:30 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Sridhar Samudrala <sri@...ibm.com>,
	Nivedita Singhvi <niv@...ibm.com>, netdev@...r.kernel.org
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

On Tue, 25 Aug 2009, Eric Dumazet wrote:

> Thread model: posix
> gcc version 4.4.1 (GCC)
> # pwd
> /opt/src/lldiag-0.14
> # make
> gcc -Wall -omcast mcast.c -lrt -lm
> mcast.c: In function ?set_ip?:
> mcast.c:121: warning: implicit declaration of function ?htons?
> mcast.c: In function ?build_pattern_array?:
> mcast.c:168: warning: implicit declaration of function ?htonl?
> /tmp/cc4sYCDr.o: In function `lock':
> mcast.c:(.text+0xcad): undefined reference to `__sync_fetch_and_add_4'
> collect2: ld returned 1 exit status
> make: *** [mcast] Error 1
>
>
> I have no idea where is defined sync_fetch_and_add

Its a GCC builtin for x86 sigh. Ok will put out 0.15 that disables their
use by default.

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