netdev - Re: [RFC PATCH 1/2] net: Add new network device function to allow for MMIO batching

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Date:	Fri, 13 Jul 2012 18:23:24 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev@...r.kernel.org, davem@...emloft.net,
	jeffrey.t.kirsher@...el.com, edumazet@...gle.com,
	bhutchings@...arflare.com, therbert@...gle.com,
	alexander.duyck@...il.com
Subject: Re: [RFC PATCH 1/2] net: Add new network device function to allow
 for MMIO batching

On Fri, 2012-07-13 at 08:50 -0700, Stephen Hemminger wrote:
> On Fri, 13 Jul 2012 09:38:49 +0200
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > Frankly what percentage of linux powered machines act as high perf
> > routers ?
> 
> More than you think, every Linux machine acting as hypervisor (Xen and KVM)
> is also doing this.


High perf router meant : ability to route 10 Mpps, without help of TSO.

If an hypervisor is enable to use TSO, I expect very bad performances
anyway.



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