netdev - Re: irq disable in __netdev_alloc

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Date:	Wed, 22 Oct 2014 22:14:04 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: irq disable in __netdev_alloc_frag() ?

On Wed, 2014-10-22 at 21:29 -0700, Alexei Starovoitov wrote:

> my numbers were from just released Xeon E5-1630 v3
> which is haswell-ep
> I think Alexander's idea is worth pursuing.
> Code-wise the bloat is minimal: one extra netdev_alloc_cache
> and few 'if' which one to choose.


> Most of the time only one of them is used, since
> systems with napi and not-napi nics are very rare.


> I think it should help virtualization case as well,
> since virtio_net is napi already.

Really, I doubt this will make any difference in real workloads
where bottleneck is memory bandwidth, not the time taken by
pushf/cli/popf.

What difference do you have on a real workload like : netperf TCP_RR or
UDP_RR ?



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