netdev - Re: [net-next PATCH 4/4] net: frag LRU list per CPU

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Message-ID: <1366900643.8964.152.camel@edumazet-glaptop>
Date:	Thu, 25 Apr 2013 07:37:23 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	netdev@...r.kernel.org
Subject: Re: [net-next PATCH 4/4] net: frag LRU list per CPU

On Thu, 2013-04-25 at 16:06 +0200, Jesper Dangaard Brouer wrote:

> I like this idea (just don't know how to implement it).  As my perf
> results with "direct-hash-cleaning", show that we can hit a very
> unfortunate situation, where the add/remove timer spinlock gets
> hot/congested.

Remove the timer per frag, problem solved ;)

With one million frags around, we do not want one million active timers.



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