[dpdk-dev] [PATCH v2 0/5] virtio: Tx performance improvements

[Xie, Huawei]

On 10/22/2015 6:39 PM, Xie, Huawei wrote:
> On 10/21/2015 9:20 PM, Thomas Monjalon wrote:
>> 2015-10-18 22:16, Stephen Hemminger:
>>> This is a tested version of the virtio Tx performance improvements
>>> that I posted earlier on the list, and described at the DPDK Userspace
>>> meeting in Dublin. Together they get a 25% performance improvement for
>>> both small packet and large multi-segment packet case when testing
>>> from DPDK guest application to Linux KVM host.
>>>
>>> Stephen Hemminger (5):
>>>   virtio: clean up space checks on xmit
>>>   virtio: don't use unlikely for normal tx stuff
>>>   virtio: use indirect ring elements
>>>   virtio: use any layout on transmit
>>>   virtio: optimize transmit enqueue
>> Huawei, do you ack this series?
>>
> Okay with this patchset with two remained questions,
Forget to cc Stephen.
>
> +/* Region reserved to allow for transmit header and indirect ring */
> +#define VIRTIO_MAX_TX_INDIRECT 8
> +struct virtio_tx_region {
> +	struct virtio_net_hdr_mrg_rxbuf tx_hdr;
>
> Why use merge-able rx header here in the tx region?
>
>> +	struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
>> +			   __attribute__((__aligned__(16)));
> WARNING: __aligned(size) is preferred over __attribute__((aligned(size)))
> [...]
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