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

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Message-ID: <20100208155053.4ad68484@nehalam>
Date:	Mon, 8 Feb 2010 15:50:53 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
	pstaszewski@...are.pl, netdev@...r.kernel.org
Subject: Re: [PATCH] dst: call cond_resched() in dst_gc_task()

On Mon, 8 Feb 2010 15:37:44 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> 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?

No, cache doesn't help.

Robert who is the expert in this area, runs with FIB TRIE and
no routing cache.
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