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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