kern/108375: commit references a PR

dfilter service dfilter at FreeBSD.ORG
Tue Mar 20 13:20:09 UTC 2007


The following reply was made to PR kern/108375; it has been noted by GNATS.

From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/108375: commit references a PR
Date: Tue, 20 Mar 2007 13:15:35 +0000 (UTC)

 bms         2007-03-20 13:15:20 UTC
 
   FreeBSD src repository
 
   Modified files:
     sys/netinet          raw_ip.c 
   Log:
   Increase default size of raw IP send and receive buffers to the same as
   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
   
   Revision  Changes    Path
   1.170     +2 -8      src/sys/netinet/raw_ip.c
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