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Increase default size of raw IP send and receive buffers to the same as

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udp_sendspace, to avoid a situation where jumbograms (datagrams > 9KB)
are unnecessarily fragmented.

A common use case for this is OSPF link-state database synchronization
during adjacency bringup on a high speed network with a large MTU.

It is not possible to auto-tune this setting until a socket is bound to
a given interface, and because the laddr part of the inpcb tuple may be
overridden, it makes no sense to do so. Applications may request a larger
socket buffer size by using the SO_SENDBUF and SO_RECVBUF socket options.

Certain applications such as Quagga ospfd do not probe for interface MTU
and therefore do not increase SO_SENDBUF in this use case.
XORP is not affected by this problem as it preemptively uses SO_SENDBUF
and SO_RECVBUF to account for any possible additional latency in XRL IPC.

PR:		kern/108375
Requested by:	Vladimir Ivanov
MFC after:	1 week
This commit is contained in:
Bruce M Simpson 2007-03-20 13:15:20 +00:00
parent 94d36aa276
commit c7547d1aaf
1 changed files with 2 additions and 8 deletions
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10
sys/netinet/raw_ip.c
View file

@ -105,12 +105,6 @@ void (*rsvp_input_p)(struct mbuf *m, int off);
int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
void (*ip_rsvp_force_done)(struct socket *);
/*
* Nominal space allocated to a raw ip socket.
*/
#define RIPSNDQ 8192
#define RIPRCVQ 8192
/*
* Raw interface to IP protocol.
*/
@ -595,8 +589,8 @@ rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
}
}
u_long rip_sendspace = RIPSNDQ;
u_long rip_recvspace = RIPRCVQ;
u_long rip_sendspace = 9216;
u_long rip_recvspace = 9216;
SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
&rip_sendspace, 0, "Maximum outgoing raw IP datagram size");