Re: W/RTT verification, linux tcp buffers behaviour

From: Constantinos Makassikis
Date: Wed May 17 2006 - 03:36:24 EST

On 5/15/06, Stephen Hemminger <shemminger@xxxxxxxx> wrote:

> Indeed, but aren't tcp-rmem/tcp_wmem taken into account only when
> autotuning is enabled ?

The tcp_rmem[2] and tcp_wmem[2] are still an upper bound on the allowed
socket memory.

From Documentation/networking/ip-sysctl.txt

tcp_wmem - vector of 3 INTEGERs: min, default, max
max: Maximal amount of memory allowed for automatically selected
send buffers for TCP socket. This value does not override
net.core.wmem_max, "static" selection via SO_SNDBUF does not use this.
Default: 128K

I am really lost NOW :-(

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