netdev - Re: [PATCH 00/16] Remove the ipv4 routing cache

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Message-ID: <1343324175.2626.11790.camel@edumazet-glaptop>
Date:	Thu, 26 Jul 2012 19:36:15 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache

On Thu, 2012-07-26 at 19:31 +0200, Eric Dumazet wrote:
> On Thu, 2012-07-26 at 10:18 -0700, Alexander Duyck wrote:
> 
> > I tested this patch and it looks like it runs, but still has the same
> > performance issue.  I did some digging into the annotation for
> > ip_route_intput_noref and it seems like the issue is that I am hitting
> > the dst_hold call in  __mkroute_input.
> 
> David suggested a percpu cache.
> 
> nh_rth_input would be allocated by alloc_percpu(struct dst *)
> 
> I can work on this.

Wait a minute, on input we should use the noref trick too.


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