Hi,
If you want to set it more than 512KB you need to grow maxsockbuf so:
#sysctl -w kern.ipc.maxsockbuf=2147483648
The waste factor is used (see /sys/kern/uipc_socket2.c) to make the socket
buffer
specifed a multiple of 8 (basically your buffers becomes a multiple of
32bits) for efficient
usilisation of memory.
good luck.
Karim Fodil-Lemelin.
Xiphos Technologies.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Cheng Jin
Sent: Monday, September 23, 2002 7:23 PM
To: [EMAIL PROTECTED]
Subject: TCP receiving buffer
Hi all,
I am having a hard time setting TCP receiving buffer space to be large
than 512K using setsockopt under FreeBSD 4.6.2-RELEASE #0.
I have tried playing with various sysctl variables, but I can't seem to
break the 512K barrier. I looked at my kernel config file and didn't
really find any hard limit either.
here are the systcl vars that I have tried. nmbclusters is small,
but I should still be able to get about 12 MB of clusters. Any idea on
what sockbuf_waste_factor is?? It was 8 by default. Do I have to reduce
the number of sockets for this to work?
kern.ipc.maxsockbuf: 4094305
kern.ipc.sockbuf_waste_factor: 4
kern.ipc.somaxconn: 512
kern.ipc.nmbclusters: 6656
kern.ipc.nmbufs: 26624
kern.ipc.maxsockets: 12328
net.inet.tcp.sendspace: 32768
net.inet.tcp.recvspace: 4094305
Please cc me a copy when you reply.
Thank you very much,
Cheng
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