From: Jason Wang <jasowang@redhat.com>
To: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Cc: virtualization <virtualization@lists.linux-foundation.org>,
netdev <netdev@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
bpf@vger.kernel.org, "Zhu, Lingshan" <lingshan.zhu@intel.com>
Subject: Re: [PATCH v5 20/22] virtio_net: set the default max ring num
Date: Mon, 21 Feb 2022 15:00:17 +0800 [thread overview]
Message-ID: <d8011051-dc45-85f6-3630-4ba0cf6179b2@redhat.com> (raw)
In-Reply-To: <2a7acc5a-2c4d-2176-efd6-2aa828833587@redhat.com>
在 2022/2/21 上午11:40, Jason Wang 写道:
>
> 在 2022/2/17 下午5:30, Xuan Zhuo 写道:
>> On Thu, 17 Feb 2022 15:21:26 +0800, Jason Wang <jasowang@redhat.com>
>> wrote:
>>> On Wed, Feb 16, 2022 at 3:52 PM Xuan Zhuo
>>> <xuanzhuo@linux.alibaba.com> wrote:
>>>> On Wed, 16 Feb 2022 12:14:31 +0800, Jason Wang
>>>> <jasowang@redhat.com> wrote:
>>>>> On Mon, Feb 14, 2022 at 4:14 PM Xuan Zhuo
>>>>> <xuanzhuo@linux.alibaba.com> wrote:
>>>>>> Sets the default maximum ring num based on
>>>>>> virtio_set_max_ring_num().
>>>>>>
>>>>>> The default maximum ring num is 1024.
>>>>> Having a default value is pretty useful, I see 32K is used by
>>>>> default for IFCVF.
>>>>>
>>>>> Rethink this, how about having a different default value based on
>>>>> the speed?
>>>>>
>>>>> Without SPEED_DUPLEX, we use 1024. Otherwise
>>>>>
>>>>> 10g 4096
>>>>> 40g 8192
>>>> We can define different default values of tx and rx by the way.
>>>> This way I can
>>>> just use it in the new interface of find_vqs().
>>>>
>>>> without SPEED_DUPLEX: tx 512 rx 1024
>>>>
>>> Any reason that TX is smaller than RX?
>>>
>> I've seen some NIC drivers with default tx smaller than rx.
>
>
> Interesting, do they use combined channels?
Adding Ling Shan.
I see 32K is used for IFCVF by default, this is another call for the
this patch:
# ethtool -g eth0
Ring parameters for eth0:
Pre-set maximums:
RX: 32768
RX Mini: 0
RX Jumbo: 0
TX: 32768
Current hardware settings:
RX: 32768
RX Mini: 0
RX Jumbo: 0
TX: 32768
Thanks
>
>
>>
>> One problem I have now is that inside virtnet_probe, init_vqs is
>> before getting
>> speed/duplex. I'm not sure, can the logic to get speed/duplex be put
>> before
>> init_vqs? Is there any risk?
>>
>> Can you help me?
>
>
> The feature has been negotiated during probe(), so I don't see any risk.
>
> Thanks
>
>
>>
>> Thanks.
>>
>>> Thanks
>>>
>>>> Thanks.
>>>>
>>>>
>>>>> etc.
>>>>>
>>>>> (The number are just copied from the 10g/40g default parameter from
>>>>> other vendors)
>>>>>
>>>>> Thanks
>>>>>
>>>>>> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
>>>>>> ---
>>>>>> drivers/net/virtio_net.c | 4 ++++
>>>>>> 1 file changed, 4 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>>>>>> index a4ffd7cdf623..77e61fe0b2ce 100644
>>>>>> --- a/drivers/net/virtio_net.c
>>>>>> +++ b/drivers/net/virtio_net.c
>>>>>> @@ -35,6 +35,8 @@ module_param(napi_tx, bool, 0644);
>>>>>> #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
>>>>>> #define GOOD_COPY_LEN 128
>>>>>>
>>>>>> +#define VIRTNET_DEFAULT_MAX_RING_NUM 1024
>>>>>> +
>>>>>> #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
>>>>>>
>>>>>> /* Amount of XDP headroom to prepend to packets for use by
>>>>>> xdp_adjust_head */
>>>>>> @@ -3045,6 +3047,8 @@ static int virtnet_find_vqs(struct
>>>>>> virtnet_info *vi)
>>>>>> ctx[rxq2vq(i)] = true;
>>>>>> }
>>>>>>
>>>>>> + virtio_set_max_ring_num(vi->vdev,
>>>>>> VIRTNET_DEFAULT_MAX_RING_NUM);
>>>>>> +
>>>>>> ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs,
>>>>>> callbacks,
>>>>>> names, ctx, NULL);
>>>>>> if (ret)
>>>>>> --
>>>>>> 2.31.0
>>>>>>
next prev parent reply other threads:[~2022-02-21 7:00 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 8:13 [PATCH v5 00/22] virtio pci support VIRTIO_F_RING_RESET Xuan Zhuo
2022-02-14 8:13 ` [PATCH v5 01/22] virtio_pci: struct virtio_pci_common_cfg add queue_notify_data Xuan Zhuo
2022-02-14 8:13 ` [PATCH v5 02/22] virtio: queue_reset: add VIRTIO_F_RING_RESET Xuan Zhuo
2022-02-14 8:13 ` [PATCH v5 03/22] virtio_ring: queue_reset: add function vring_setup_virtqueue() Xuan Zhuo
2022-02-14 8:13 ` [PATCH v5 04/22] virtio_ring: queue_reset: split: add __vring_init_virtqueue() Xuan Zhuo
2022-02-14 8:13 ` [PATCH v5 05/22] virtio_ring: queue_reset: split: support enable reset queue Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 06/22] virtio_ring: queue_reset: packed: " Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-14 8:14 ` [PATCH v5 07/22] virtio_ring: queue_reset: extract the release function of the vq ring Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 08/22] virtio_ring: queue_reset: add vring_release_virtqueue() Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-14 8:14 ` [PATCH v5 09/22] virtio: queue_reset: struct virtio_config_ops add callbacks for queue_reset Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 10/22] virtio_pci: queue_reset: update struct virtio_pci_common_cfg and option functions Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 11/22] virtio_pci: queue_reset: release vq by vp_dev->vqs Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 12/22] virtio_pci: queue_reset: setup_vq() support vring_setup_virtqueue() Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 13/22] virtio_pci: queue_reset: reserve vq->priv for re-enable queue Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 14/22] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-16 8:03 ` Xuan Zhuo
2022-02-17 7:25 ` Jason Wang
2022-02-14 8:14 ` [PATCH v5 15/22] virtio: queue_reset: add helper Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 16/22] virtio_net: split free_unused_bufs() Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 17/22] virtio_net: support rx/tx queue reset Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-16 7:56 ` Xuan Zhuo
2022-02-16 8:35 ` Michael S. Tsirkin
2022-02-16 8:42 ` Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 18/22] virtio: add helper virtqueue_get_vring_max_size() Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 19/22] virtio: add helper virtio_set_max_ring_num() Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-16 7:54 ` Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 20/22] virtio_net: set the default max ring num Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-16 7:46 ` Xuan Zhuo
2022-02-17 7:21 ` Jason Wang
2022-02-17 9:30 ` Xuan Zhuo
2022-02-21 3:40 ` Jason Wang
2022-02-21 7:00 ` Jason Wang [this message]
2022-02-14 8:14 ` [PATCH v5 21/22] virtio_net: get max ring size by virtqueue_get_vring_max_size() Xuan Zhuo
2022-02-14 8:14 ` [PATCH v5 22/22] virtio_net: support set_ringparam Xuan Zhuo
2022-02-16 4:14 ` Jason Wang
2022-02-16 7:21 ` Xuan Zhuo
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