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Date: Sun, 18 Oct 2015 21:16:57 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
To: Huawei Xie <huawei.xie@intel.com>
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 6/7] virtio: simple tx routine
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On Sun, 18 Oct 2015 14:29:03 +0800
Huawei Xie <huawei.xie@intel.com> wrote:

> bulk free of mbufs when clean used ring.
> shift operation of idx could be further saved if vq_free_cnt means
> free slots rather than free descriptors.
> 
> Signed-off-by: Huawei Xie <huawei.xie@intel.com>

Did you measure this. I finished my transmit optimizations and gets 25% performance improvement
without any of these restrictions.