Yes, TCP_NODELAY is a socket option:
Going back to the kernel source:
include/linux/tcp.h:
#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
and this:
u8 nonagle : 4,/* Disable Nagle algorithm? */
and looking into the kernel source code:
./fs/ocfs2/cluster/tcp.c:
ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
./net/rds/tcp.c:
sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val,
the above are just two of the examples of how to set TCP_NODELAY in the kernel.
At the userspace level:
http://www.linuxquestions.org/questions/other-*nix-55/how-do-i-disable-the-nagle-algorithm-in-enterprise-linux-3-kernel-ver-2-4-21-4-a-556170/
should be the correct way, except that the poster is attempting to do
it in a kernel that does not support it.
As documented in http://linux.die.net/man/7/tcp, the supported kernel
is 2.5.71 and onwards.
Okay ... so, the situation I have at hand is that there is this app I cannot modify. I'd like to see its performance with nagle disabled. Is this possible?
While at it, is there a way to see the socket options of the socket descriptors in a running app?
Regards,
Kashyap
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