Displaying 5 results from an estimated 5 matches for "sudbuf".
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sndbuf
2017 Sep 05
1
[PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi
...t;> descriptors?
>>
>> Typo, sorry. I meant out of sndbuf.
>
>
> I mean e.g for tun. If its sndbuf is smaller than e.g (vq->num >> 1) *
> $pkt_size and if all packet were held by some modules, limitation like
> vq->num >> 1 won't work since we hit sudbuf before it.
Good point.
>>
>>> A watchdog would help somewhat. With tx-napi, this case cannot occur,
>>> either, as free_old_xmit_skbs no longer depends on a call to start_xmit.
>>>
>>>> 2) tx napi is used for virtio-net
>>>
>>> I am n...
2017 Sep 05
1
[PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi
...t;> descriptors?
>>
>> Typo, sorry. I meant out of sndbuf.
>
>
> I mean e.g for tun. If its sndbuf is smaller than e.g (vq->num >> 1) *
> $pkt_size and if all packet were held by some modules, limitation like
> vq->num >> 1 won't work since we hit sudbuf before it.
Good point.
>>
>>> A watchdog would help somewhat. With tx-napi, this case cannot occur,
>>> either, as free_old_xmit_skbs no longer depends on a call to start_xmit.
>>>
>>>> 2) tx napi is used for virtio-net
>>>
>>> I am n...
2017 Sep 01
2
[PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi
>>> This is not a 50/50 split, which impliesTw that some packets from the
>>> large
>>> packet flow are still converted to copying. Without the change the rate
>>> without queue was 80k zerocopy vs 80k copy, so this choice of
>>> (vq->num >> 2) appears too conservative.
>>>
>>> However, testing with (vq->num >> 1) was
2017 Sep 01
2
[PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi
>>> This is not a 50/50 split, which impliesTw that some packets from the
>>> large
>>> packet flow are still converted to copying. Without the change the rate
>>> without queue was 80k zerocopy vs 80k copy, so this choice of
>>> (vq->num >> 2) appears too conservative.
>>>
>>> However, testing with (vq->num >> 1) was
2017 Sep 04
0
[PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi
...now the (only) socket is out of
>> descriptors?
> Typo, sorry. I meant out of sndbuf.
I mean e.g for tun. If its sndbuf is smaller than e.g (vq->num >> 1) *
$pkt_size and if all packet were held by some modules, limitation like
vq->num >> 1 won't work since we hit sudbuf before it.
>
>> A watchdog would help somewhat. With tx-napi, this case cannot occur,
>> either, as free_old_xmit_skbs no longer depends on a call to start_xmit.
>>
>>> 2) tx napi is used for virtio-net
>> I am not aware of any issue specific to the use of tx-na...