netdev - Re: [PATCH] dst: call cond_resched() in dst_gc

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Message-Id: <20100208153744.236158aa.akpm@linux-foundation.org>
Date:	Mon, 8 Feb 2010 15:37:44 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, pstaszewski@...are.pl,
	netdev@...r.kernel.org
Subject: Re: [PATCH] dst: call cond_resched() in dst_gc_task()

On Mon, 08 Feb 2010 15:34:06 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: Andrew Morton <akpm@...ux-foundation.org>
> Date: Mon, 8 Feb 2010 15:26:06 -0800
> 
> > I assume that this function spends most of its time walking over busy
> > entries?  Is a more powerful data structure needed?
> 
> When you're getting pounded with millions of packets per second,
> all mostly to different destinations (and thus resolving to
> different routing cache entries), this is what happens.
> 
> For a busy router, really, this is normal behavior.

Is the cache a net win in that scenario?
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