netdev - Re: [RFC PATCH] Regression in linux 2.6.32 virtio

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Message-ID: <20091217224154.GA3769@ami.dom.local>
Date:	Thu, 17 Dec 2009 23:41:54 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Sridhar Samudrala <sri@...ibm.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Krishna Kumar2 <krkumar2@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, mst@...hat.com,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC PATCH] Regression in linux 2.6.32 virtio_net seen with
 vhost-net

On Thu, Dec 17, 2009 at 02:28:10PM -0800, Sridhar Samudrala wrote:
> Another interesting observation that Jarek pointed out is that if we drop skb's, i guess
> it is causing TCP to backoff and enabling TCP GSO code to send much larger packets(64K 
> compared to 16K). So although the throughput is higher, packets/sec is less in that
> case.

Maybe you're right, but there would be useful to have TCP-independent
tests to compare, or at least without such impact, so with GSO disabled.

Jarek P.
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