Messages in this thread Patch in this message | | | From | Ivan Babrou <> | Subject | [PATCH net] tcp: note that tcp_rmem[1] has a limited range | Date | Mon, 3 Jan 2022 16:37:22 -0800 |
| |
The value of rcv_ssthresh is limited to tcp_rwin, which is limited to 64k at the handshake time, since window scaling is not allowed there.
Let's add a note to the docs that increasing tcp_rmem[1] does not have any effect on raising the initial value of rcv_ssthresh past 64k.
Link: https://lkml.org/lkml/2021/12/22/652 Signed-off-by: Ivan Babrou <ivan@cloudflare.com> --- Documentation/networking/ip-sysctl.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index 2572eecc3e86..16528bc92e65 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -683,7 +683,8 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max default: initial size of receive buffer used by TCP sockets. This value overrides net.core.rmem_default used by other protocols. Default: 131072 bytes. - This value results in initial window of 65535. + This value results in initial window of 65535. Increasing this value + won't raise the initial advertised window above 65535. max: maximal size of receive buffer allowed for automatically selected receiver buffers for TCP socket. This value does not override -- 2.34.1
| |