netdev - Re: [Patch 3/5] Network Drop Monitor: Adding kfree_skb_clean for non-drops and modifying end-of-line points for skbs

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Message-ID: <20090311213902.GA18878@ioremap.net>
Date:	Thu, 12 Mar 2009 00:39:02 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [Patch 3/5] Network Drop Monitor: Adding kfree_skb_clean for non-drops and modifying end-of-line points for skbs

On Wed, Mar 11, 2009 at 01:07:01PM -0400, Neil Horman (nhorman@...driver.com) wrote:
> > I was wondering if packets droped at NIC level are handled by "Network Drop Monitor".
> > (See recent discussion about Multicast packet loss)
> > 
> > I believe not, maybe I missed something ...
> > 
> No, unfortunately, theres no really good way to detect drops at the driver level
> without polling them periodically, which I think is somewhat in opposition to the
> point of this utility.  I'd welcome suggestions however.

It could be possible to check softnet stats difference when napi is
scheduled or drop monitor is about to send a packet to the userspace
about different drop.

-- 
	Evgeniy Polyakov
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