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unix: Increase the default datagram recv buffer size

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syslog(3) was recently change to support larger messages, up to 8KB.
Our syslogd handles this fine, as it adjusts /dev/log's recv buffer to a
large size.  rsyslog, however, uses the system default of 4KB.  This
leads to problems since our syslog(3) retries indefinitely when a send()
returns ENOBUFS, but if the message is large enough this will never
succeed.

Increase the default recv buffer size for datagram sockets to support
8KB syslog messages without requiring the logging daemon to adjust its
buffers.

PR:		260126
Reviewed by:	asomers
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33380
This commit is contained in:
Mark Johnston 2021-12-17 10:59:29 -05:00
parent d079fc197a
commit d157f2627b
1 changed files with 1 additions and 1 deletions
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2
sys/kern/uipc_usrreq.c
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@ -157,7 +157,7 @@ static struct task unp_defer_task;
static u_long unpst_sendspace = PIPSIZ;
static u_long unpst_recvspace = PIPSIZ;
static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
static u_long unpdg_recvspace = 4*1024;
static u_long unpdg_recvspace = 16*1024; /* support 8KB syslog msgs */
static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
static u_long unpsp_recvspace = PIPSIZ;