Date: Wed, 07 Jun 2006 14:01:50 -0400 From: Martin Karsten <mkarsten@cs.uwaterloo.ca> To: freebsd-net@freebsd.org Subject: mbuf size and NFS Message-ID: <4487148E.4020807@cs.uwaterloo.ca>
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Some time ago I wanted to do experiments with a reduced mbuf size, just
for the sake of it. Changing MSIZE (to 128 in this case) and recompiling
the kernel seemed to do the job, although I only tested fairly standard
functionality. This was on a 5.4-RELEASE system.
However, I noticed one problem with NFS which seems to be easily
fixable. The following patch is for
src/sys/nfs/nfs_common.c,v 1.117.2.1 2005/10/09
@@ -187,7 +187,9 @@
} else if (mp->m_next == NULL) {
return NULL;
} else if (siz > MHLEN) {
- panic("nfs S too big");
+ MCLGET(mp2, how);
+ if (mp2 == NULL)
+ return NULL;
} else {
MGET(mp2, how, MT_DATA);
if (mp2 == NULL)
I actually tested it with 'how' being hardcoded to M_TRYWAIT.
I just wanted to flag this to see whether the fix is obviously wrong or
whether a such change could be incorporated into the kernel.
Thanks,
Martin
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