netdev - Re: [PATCHv1] xen-netfront: always keep the Rx ring full of requests

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Message-Id: <20141003.155412.519359151723073387.davem@davemloft.net>
Date:	Fri, 03 Oct 2014 15:54:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	david.vrabel@...rix.com
Cc:	netdev@...r.kernel.org, xen-devel@...ts.xenproject.org,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com
Subject: Re: [PATCHv1] xen-netfront: always keep the Rx ring full of
 requests

From: David Vrabel <david.vrabel@...rix.com>
Date: Thu, 2 Oct 2014 14:33:46 +0100

> A full Rx ring only requires 1 MiB of memory.  This is not enough
> memory that it is useful to dynamically scale the number of Rx
> requests in the ring based on traffic rates.
> 
> Keeping the ring full of Rx requests handles bursty traffic better
> than trying to converges on an optimal number of requests to keep
> filled.
> 
> On a 4 core host, an iperf -P 64 -t 60 run from dom0 to a 4 VCPU guest
> improved from 5.1 Gbit/s to 5.6 Gbit/s.  Gains with more bursty
> traffic are expected to be higher.
> 
> Signed-off-by: David Vrabel <david.vrabel@...rix.com>

Can I get an ACK from someone else knowledgable about this area?

Thanks!
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