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Re: [Xen-devel] TSQ accounting skb->truesize degrades throughput for large packets

To: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>
From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Fri, 06 Sep 2013 10:00:40 -0700
Cc: Jonathan Davies <Jonathan.Davies@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Campbell <ian.campbell@xxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx
Delivery-date: Fri, 06 Sep 2013 17:00:59 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Fri, 2013-09-06 at 17:36 +0100, Zoltan Kiss wrote:

> So I guess it would be good to revisit the default value of this 
> setting.

If ixgbe requires 3 TSO packets in TX ring to get line rate, you also
can tweak dev->gso_max_size from 65535 to 64000.

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