netdev - Re: [PATCH net-next] net: introduce napi_schedule

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Message-ID: <CAADnVQJzk2_Kx=BGpYnNzpQb7OqSZ+KaeKFbUZxJ27WKC+DZww@mail.gmail.com>
Date:	Tue, 28 Oct 2014 22:13:43 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: introduce napi_schedule_irqoff()

On Tue, Oct 28, 2014 at 9:40 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2014-10-28 at 21:17 -0700, Alexei Starovoitov wrote:
>> On Tue, Oct 28, 2014 at 8:30 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> > On Tue, 2014-10-28 at 18:17 -0700, Alexei Starovoitov wrote:
>> >
>> >> Interesting! Are you trying to optimize some of such NIC drivers? ;)
>> >
>> > ??
>> >
>> >> but all of 10G+ and virtio won't apply, right?
>> >
>> >
>> > Which 10G+ driver could not use this ?
>> >
>> > mlx4 patch would be :
>>
>> right.
>> but it's not a critical path for napi drivers. Why bother?
>
> You probably are missing something.
>
> This is a critical path, of course.
>
> Try netperf -t TCP_RR for example.

tried 50 parallel netperf -t TCP_RR over ixgbe
and perf top were tcp stack bits, qdisc locks and netperf itself.
What do you see?
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