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

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Date:	Thu, 26 Jul 2012 15:03:39 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache

On Thu, Jul 26, 2012 at 2:06 PM, David Miller <davem@...emloft.net> wrote:
> From: Alexander Duyck <alexander.duyck@...il.com>
> Date: Thu, 26 Jul 2012 11:26:26 -0700
>
>> The previous results were with a slight modifications to your earlier
>> patch.  With this patch applied I am seeing 10.4Mpps with 8 queues,
>> reaching a maximum of 11.6Mpps with 9 queues.
>
> For fun you might want to see what this patch does for your tests,
> it should cut the number of fib_table_lookup() calls roughly in half.

So with your patch, Eric's patch, and this most recent patch we are
now at 11.8Mpps with 8 or 9 queues.  At this point I am staring to hit
the hardware limits since 82599 will typically max out at about 12Mpps
w/ 9 queues.

Here is the latest perf results with all of these patches in place.
As you predicted your patch essentially cut the lookup overhead in
half:
    10.65%  [k] ixgbe_poll
     7.77%  [k] fib_table_lookup
     6.21%  [k] ixgbe_xmit_frame_ring
     6.08%  [k] __netif_receive_skb
     4.41%  [k] _raw_spin_lock
     3.95%  [k] kmem_cache_free
     3.30%  [k] build_skb
     3.17%  [k] memcpy
     2.96%  [k] dev_queue_xmit
     2.79%  [k] ip_finish_output
     2.66%  [k] kmem_cache_alloc
     2.57%  [k] check_leaf
     2.52%  [k] ip_route_input_noref
     2.50%  [k] netdev_alloc_frag
     2.17%  [k] ip_rcv
     2.16%  [k] __phys_addr

I will probably do some more poking around over the next few days in
order to get my head around the fib_table_lookup overhead.

Thanks,

Alex
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