Re: [PATCH resend] drop_monitor: fix trace_napi_poll_hit()

From: David Miller
Date: Mon Aug 31 2009 - 07:47:00 EST

From: Neil Horman <nhorman@xxxxxxxxxxxxx>
Date: Mon, 31 Aug 2009 07:12:46 -0400

> If its not going to be consistently updated, why are still carrying
> that field in dev? Are we just waiting on someone to do the
> janitorial work to remove it? If so, I can, and I'll fix up the
> drop monitor in the process, to use a private timestamp.

It's used only for bonding, so we only update it when a device
receives packet as part of a bond.

%99.9999 of people are not in that situation, and in that case this is
a very wasteful and expensive cacheline dirtying, so we elide it when
we can.
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