netdev - Re: Increased multicast packet drops in 3.4

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Message-ID: <1346912779.13121.178.camel@edumazet-glaptop>
Date:	Thu, 06 Sep 2012 08:26:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shawn Bohrer <sbohrer@...advisors.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Increased multicast packet drops in 3.4

On Wed, 2012-09-05 at 19:11 -0500, Shawn Bohrer wrote:
> One thing I find interesting is that some of the time 2
> or 3 of the 8 processes will report that they missed the exact same
> 50+ packets.  Since the other processes receive the packets I know
> that they are making it to the machine and past the driver.

Could it be that these processes missing 50+ packets provide a non
accessible area of memory and these recvmsg() calls return EFAULT ?

Are you using special memory areas, using mprotect(), or huge pages for
example ?


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