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

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Date:	Thu, 26 Jul 2012 11:26:26 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache

On Thu, Jul 26, 2012 at 10:48 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Thu, 2012-07-26 at 19:43 +0200, Eric Dumazet wrote:
>> On Thu, 2012-07-26 at 19:36 +0200, Eric Dumazet wrote:
>> > 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.
>> >
>>
>> Something like : (on top of latest David patch)
>
> Sorry updated patch : (missing skb_dst_set() before 'out' label)

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.

When we have a final version for this patch let me know and I will
give it a quick run and throw in my tested by.

Thanks,

Alex
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