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> That stall is clean - the one end isnt reading data. That means either there
> is a problem where the kernel forgot to wake the other end (quite possible)
> or the user application is selecting on the wrong thing/busy/whatever
Well, strace says for the receiver:
select(4, [3], NULL, NULL, NULL) = 1 (in [3])
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 15) = 15
select(4, [3], NULL, NULL, NULL) = 1 (in [3])
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 15) = 15
select(4, [3], NULL, NULL, NULL) = 1 (in [3])
read(3, "\0\0\0\0\0\0\0\0\0\0", 15) = 10
select(4, [3], NULL, NULL, NULL <unfinished ...>
The blocking select() call is the same as the select()
calls before. And even if the receiver would be busy,
netstat should report data in the Recv-Q, right? It doesn't.
Instead it reports data in the Send-Q of the sender.
>
> You said you had a simple demo app, for this - can you let me have a look at
> it
I have attached client.c, serv.c and Makefile. Serv listens on port 3333
and forks on incoming connections. Then it sends about 5Mb of data.
Usually the client stalls after reading 30kb.
Note the #define READ_SIZE 15. When increasing READ_SIZE to >>100 bytes,
the connection does not stall.
Matthias
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