netdev - Re: [PATCH net-next] net dst: use a percpu

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Message-Id: <20101011.130758.70192030.davem@davemloft.net>
Date:	Mon, 11 Oct 2010 13:07:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net dst: use a percpu_counter to track entries

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 08 Oct 2010 18:37:34 +0200

> struct dst_ops tracks number of allocated dst in an atomic_t field,
> subject to high cache line contention in stress workload.
> 
> Switch to a percpu_counter, to reduce number of time we need to dirty a
> central location. Place it on a separate cache line to avoid dirtying
> read only fields.
 ...
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

When I first read the subject line for this patch, I was
scared, because I thought you were using a percpu counter
for dst entry refcounts :-)

Anyways this is fine, applied, thanks!
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