kern/75277: netstat -m 'mbufs in use' output appears to be incorrect

[Kris Kennaway]

The following reply was made to PR kern/75277; it has been noted by GNATS.

From: Kris Kennaway <kris at obsecurity.org>
To: Martin Matuska <matuska at firma.zoznam.sk>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: kern/75277: netstat -m 'mbufs in use' output appears to be incorrect
Date: Wed, 2 Mar 2005 17:15:03 -0800

 On Wed, Mar 02, 2005 at 04:40:24PM +0000, Martin Matuska wrote:
 > The following reply was made to PR kern/75277; it has been noted by GNATS.
 > 
 > From: Martin Matuska <matuska at firma.zoznam.sk>
 > To: freebsd-gnats-submit at FreeBSD.org
 > Cc:  
 > Subject: Re: kern/75277: netstat -m 'mbufs in use' output appears to be incorrect
 > Date: Wed, 02 Mar 2005 17:38:31 +0100
 > 
 >  We encounter the same problem on latest 5-STABLE, on Sun Fire V65x (dual Xeon SMP machine w 4G of RAM)
 >  
 >  This system is under moderate network load - an average about 2000 tcp connections, ~350 permanent running processes
 >  
 >  FreeBSD 5.4-PRERELEASE i386, kernel built from sources: Sat Feb 26 18:19:57 CET 2005
 >  
 >  # netstat -m
 >  4294886151 mbufs in use
 >  4294959052/25600 mbuf clusters in use (current/max)
 >  0/3/6656 sfbufs in use (current/peak/max)
 >  4157529 KBytes allocated to network
 >  0 requests for sfbufs denied
 >  0 requests for sfbufs delayed
 >  0 requests for I/O initiated by sendfile
 >  2 calls to protocol drain routines
 
 This is documented in the release errata.  The stats are incorrect on
 SMP, and making them correct would impose a performance penalty.
 
 Kris