Date: Wed, 24 Aug 2011 16:18:49 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: George Neville-Neil <gnn@neville-neil.com> Cc: arch@freebsd.org Subject: Re: Updating our TCP and socket sysctl values... Message-ID: <D91D35DF-B846-40AB-8C3A-8F9A89DABA47@lists.zabbadoz.net> In-Reply-To: <132388F1-44D9-45C9-AE05-1799A7A2DCD9@neville-neil.com> References: <132388F1-44D9-45C9-AE05-1799A7A2DCD9@neville-neil.com>
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On Mar 19, 2011, at 6:37 AM, George Neville-Neil wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>=20
> Howdy,
>=20
> I believe it's time for us to upgrade our sysctl values for TCP =
sockets so that
> they are more in line with the modern world. At the moment we have =
these limits on
> our buffering:
>=20
> kern.ipc.maxsockbuf: 262144
> net.inet.tcp.recvbuf_max: 262144
> net.inet.tcp.sendbuf_max: 262144
>=20
> I believe it's time to up these values to something that's in line =
with higher speed
> local networks, such as 10G. Perhaps it's time to move these to 2MB =
instead of 256K.
>=20
> Thoughts?
This never happened, did it? Was there a reason?
Index: sys/netinet/tcp_input.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- sys/netinet/tcp_input.c (revision 225048)
+++ sys/netinet/tcp_input.c (working copy)
@@ -195,7 +195,7 @@ SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, recvbuf_i
&VNET_NAME(tcp_autorcvbuf_inc), 0,
"Incrementor step size of automatic receive buffer");
=20
-VNET_DEFINE(int, tcp_autorcvbuf_max) =3D 256*1024;
+VNET_DEFINE(int, tcp_autorcvbuf_max) =3D 2*1024*1024;
#define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, recvbuf_max, CTLFLAG_RW,
&VNET_NAME(tcp_autorcvbuf_max), 0,
Index: sys/netinet/tcp_output.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- sys/netinet/tcp_output.c (revision 225048)
+++ sys/netinet/tcp_output.c (working copy)
@@ -117,7 +117,7 @@ SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, sendbuf_i
&VNET_NAME(tcp_autosndbuf_inc), 0,
"Incrementor step size of automatic send buffer");
=20
-VNET_DEFINE(int, tcp_autosndbuf_max) =3D 256*1024;
+VNET_DEFINE(int, tcp_autosndbuf_max) =3D 2*1024*1024;
#define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, sendbuf_max, CTLFLAG_RW,
&VNET_NAME(tcp_autosndbuf_max), 0,
Index: sys/sys/sockbuf.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- sys/sys/sockbuf.h (revision 225048)
+++ sys/sys/sockbuf.h (working copy)
@@ -37,7 +37,7 @@
#include <sys/_mutex.h>
#include <sys/_sx.h>
=20
-#define SB_MAX (256*1024) /* default for max chars =
in sockbuf */
+#define SB_MAX (2*1024*1024) /* default for max chars =
in sockbuf */
=20
/*
* Constants for sb_flags field of struct sockbuf.
--=20
Bjoern A. Zeeb You have to have visions!
Stop bit received. Insert coin for new address family.
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