Updating our TCP and socket sysctl values...

[George Neville-Neil]

On Aug 24, 2011, at 12:18 , Bjoern A. Zeeb wrote:

> On Mar 19, 2011, at 6:37 AM, George Neville-Neil wrote:
> 
>> -----BEGIN PGP SIGNED MESSAGE-----
>> 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?
> 

I went back and looked at the mail thread.  I didn't see any strong objections
so I think you should commit this for 9.x.

np@ did point out that nmbclusters also lags on modern hardware so consider upping
that at the same time.

Best,
George

> 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.
> 
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