Re: [lwip-users] Problem with sending big bufferstolwip_writeandsemaphoresduring big downloads.

[Hans . Forsstrom]

Thanks, I was hoping for an answere
like that. I will twist my brain around it later and dig into our send
queue and see what I can find.


/Hans

Kieran Mansley <address@hidden>
Sent by: address@hidden

2007-04-12 09:56

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Subject	Re: [lwip-users] Problem with sending big         bufferstolwip_writeandsemaphoresduring big downloads.

On Thu, 2007-04-12 at 08:29 +0200, address@hidden
wrote:

> Yes, it looks like a deadlock problem. I haven't figured out why I
> only get it for data sizes over one TCP frame size though. 

If you send less than a frame size, chances are that the frame will go
out straight away.  If you send more than a frame size (particularly
at
the start of the connection when the congestion window is small) the
second portion might be queued waiting for an acknowledgement.  If
the
deadlock was a conflict between sending this second portion of the first
send, and the first portion of the second send, this would explain why
you get the difference in behaviour. i.e. I'd look at the send queue as
the first suspect.

Kieran



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