kern/108375: commit references a PR
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
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
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.
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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