[nanomsg] Re: issue with "received" message size
- From: Martin Sustrik <sustrik@xxxxxxxxxx>
- To: nanomsg@xxxxxxxxxxxxx
- Date: Tue, 11 Mar 2014 09:46:23 +0100
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On 11/03/14 09:43, Paul Colomiets wrote:
> Hi,
>
> On Tue, Mar 11, 2014 at 8:21 AM, Martin Sustrik
> <sustrik@xxxxxxxxxx> wrote:
>>>> And quite possibly this should be applied not on a single
>>>> nanomsg socket, but on something "lower" -- like an endpoint.
>>>> (I've not examined your code fully here yet, but I imagine it
>>>> might be possible to set up multiple "accept()" calls to
>>>> handle different endpoints and different priorities. I got
>>>> the sense this is where you were headed with the priority
>>>> stuff. So we might want to rate limit connections coming
>>>> from the internet, but not rate limit connections coming from
>>>> localhost or even our local LAN.) I've some thoughts on rate
>>>> limiting, if you'd like to explore we can discuss later.
>>
>> That can in fact be solved by receive priotities. Which are at
>> the moment not exposed by the API -- because we haven't had clear
>> use case for them.
>>
>> The idea being that with a lot of messages coming in, those from
>> higher priority connections are being received by the user first.
>> In other words, messages from lower priority connections are not
>> passed to the user, thus TCP pushback is applied effectively
>> resulting in rate-limiting of incoming data.
>>
>> The proposal thus: Let's re-introduce receive priority socket
>> option.
>>
>
> I don't think such prioritization is useful enough to create
> another feature. I think the obvious way to implement it is to use
> two sockets. (Note that you need to have two different nn_bind()
> calls to use priorities too, because nanomsg doesn't allow to have
> any distinction between two accept()'ed connections on single
> endpoint).
Doesn't the same apply to send priorities?
Martin
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