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FreeBSD TCP/IP stack , time to send ?
- From: sebastien Couret <sebastien dot couret at elios-informatique dot fr>
- To: ecos-discuss at ecos dot sourceware dot org
- Date: Tue, 22 Feb 2005 17:14:27 +0100
- Subject: [ECOS] FreeBSD TCP/IP stack , time to send ?
- Organization: Elios Informatique
- References: <1109078758.3866.7.camel@localhost.localdomain> <1109079155.11090.28.camel@hermes>
- Reply-to: sebastien dot couret at elios-informatique dot fr
Hi guyz,
I would like to know if the time to send a packet on an ethernet network with
an ecos device could be bounded.
Let's imagine we have a perfectly silent ethernet network (no packets are
currently transmitted) to avoid CSMA-CD retransmissions.
We have choosed to use FreeBSD TCP/IP stack port.
As TCP/IP stack work as two separated threads, i imagine that the scheduler
must first pass control to one of those threads which could take a fixed time
as ecOS is "realtime".
Can we garantee a maximal amount of time for sending and UDP datagram with
eCOS or not ?
If so, Is it realistic to believe it is possible to send it in 10ms ? 1ms ?
0.5 ms ? with a MPC8270 CPU on the embedded device.
Thanks for your help. Have a nice day.
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