cvs commit: src/sys/netinet raw_ip.c
glebius at FreeBSD.org
Tue Mar 20 13:51:48 UTC 2007
On Tue, Mar 20, 2007 at 01:15:20PM +0000, Bruce M Simpson wrote:
B> bms 2007-03-20 13:15:20 UTC
B> FreeBSD src repository
B> Modified files:
B> sys/netinet raw_ip.c
B> Increase default size of raw IP send and receive buffers to the same as
B> udp_sendspace, to avoid a situation where jumbograms (datagrams > 9KB)
B> are unnecessarily fragmented.
B> A common use case for this is OSPF link-state database synchronization
B> during adjacency bringup on a high speed network with a large MTU.
B> It is not possible to auto-tune this setting until a socket is bound to
B> a given interface, and because the laddr part of the inpcb tuple may be
B> overridden, it makes no sense to do so. Applications may request a larger
B> socket buffer size by using the SO_SENDBUF and SO_RECVBUF socket options.
B> Certain applications such as Quagga ospfd do not probe for interface MTU
B> and therefore do not increase SO_SENDBUF in this use case.
B> XORP is not affected by this problem as it preemptively uses SO_SENDBUF
B> and SO_RECVBUF to account for any possible additional latency in XRL IPC.
B> -u_long rip_sendspace = RIPSNDQ;
B> -u_long rip_recvspace = RIPRCVQ;
B> +u_long rip_sendspace = 9216;
B> +u_long rip_recvspace = 9216;
We've got interfaces with even larger MTU. Why shouldn't we permit sending
Totus tuus, Glebius.
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