Updating our TCP and socket sysctl values...

[Bjoern A. Zeeb]

On Mar 19, 2011, at 6:37 AM, George Neville-Neil wrote:

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> Hash: SHA1
> 
> Howdy,
> 
> 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:
> 
> kern.ipc.maxsockbuf: 262144
> net.inet.tcp.recvbuf_max: 262144
> net.inet.tcp.sendbuf_max: 262144
> 
> 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.
> 
> Thoughts?


This never happened, did it?  Was there a reason?

Index: sys/netinet/tcp_input.c
===================================================================
--- 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");
 
-VNET_DEFINE(int, tcp_autorcvbuf_max) = 256*1024;
+VNET_DEFINE(int, tcp_autorcvbuf_max) = 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
===================================================================
--- 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");
 
-VNET_DEFINE(int, tcp_autosndbuf_max) = 256*1024;
+VNET_DEFINE(int, tcp_autosndbuf_max) = 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
===================================================================
--- sys/sys/sockbuf.h   (revision 225048)
+++ sys/sys/sockbuf.h   (working copy)
@@ -37,7 +37,7 @@
 #include <sys/_mutex.h>
 #include <sys/_sx.h>
 
-#define        SB_MAX          (256*1024)      /* default for max chars in sockbuf */
+#define        SB_MAX          (2*1024*1024)   /* default for max chars in sockbuf */
 
 /*
  * Constants for sb_flags field of struct sockbuf.

-- 
Bjoern A. Zeeb                                 You have to have visions!
         Stop bit received. Insert coin for new address family.