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Re: [lwip-users] lwIP delays outgoing TCP packets by up to 500ms
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From: |
Gisle Vanem |
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Subject: |
Re: [lwip-users] lwIP delays outgoing TCP packets by up to 500ms |
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Date: |
Wed, 13 Jul 2016 09:20:49 +0200 |
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User-agent: |
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
Jakub Schmidtke wrote:
> I am using lwip with NO_SYS=1, and I have noticed
> that outgoing TCP packets are very delayed.
>
> It looks like between writing a packet (using tcp_write),
> and the time it actually written to the interface it takes usually about
> 200ms.
Maybe your sys_now() or sys_jiffies() functions are too course?
They should have a resolution of approx. 1 msec. But depending on your
hardware it could not be so easy to accomplish. BTW, what is your hardware?
I've myself built with NO_SYS=1 on djgpp/MSDOS with no long delays
as you describe. Hence I think it's a problem with your 'clock-tick'
function.
--
--gv