netdev - Re: [PATCH 2/2] vhost-net: add a spin

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Message-ID: <1329788131.13141.14.camel@localhost.localdomain>
Date:	Mon, 20 Feb 2012 17:35:31 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Anthony Liguori <aliguori@...ibm.com>, netdev@...r.kernel.org,
	Tom Lendacky <toml@...ibm.com>,
	Cristian Viana <vianac@...ibm.com>
Subject: Re: [PATCH 2/2] vhost-net: add a spin_threshold parameter

We tried similar approach before by using a minimum timer for handle_tx
to stay in the loop to accumulate more packets before enabling the guest
notification. It did have better TCP_RRs, UDP_RRs results. However, we
think this is just a debug patch. We really need to understand why
handle_tx can't see more packets to process for multiple instances
request/response type of workload first. Spinning in this loop is not a
good solution.

Thanks
Shirley

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